{"id":1318,"date":"2018-07-03T11:17:58","date_gmt":"2018-07-03T03:17:58","guid":{"rendered":"http:\/\/www.gongbiao.net.cn\/?p=1318"},"modified":"2020-01-17T08:08:22","modified_gmt":"2020-01-17T00:08:22","slug":"web-app%e5%bc%80%e5%8f%91%e4%b8%ad%e7%9a%84%e5%83%8f%e7%b4%a0%e7%9f%a5%e8%af%86%e5%92%8cviewport%e7%9f%a5%e8%af%86","status":"publish","type":"post","link":"http:\/\/www.gongbiao.net.cn\/?p=1318","title":{"rendered":"WEB APP\u5f00\u53d1\u4e2d\u7684\u50cf\u7d20\u77e5\u8bc6\u548cViewport\u77e5\u8bc6"},"content":{"rendered":"

1.\u5728\u505a\u79fb\u52a8\u7aef\u7f51\u9875\u5f00\u53d1\u65f6\uff0c\u9996\u5148\u8981\u641e\u6e05\u695a\u4e09\u79cdviewport\u548c\u4e09\u79cd\u50cf\u7d20\uff0c\u53ea\u6709\u660e\u767d\u4e86\u8fd9\u4e9b\u6982\u5ff5\uff0c\u624d\u80fd\u66f4\u597d\u5730\u5f00\u53d1\u51fa\u9002\u914d\u4e0d\u540c\u5206\u8fa8\u7387\u8bbe\u5907\u7684\u7f51\u9875\u3002
\n2.\u4f46\u53c2\u9605\u7684\u535a\u5ba2\u8d8a\u591a\uff0c\u5bf9\u8fd9\u4e9b\u6982\u5ff5\u8d8a\u662f\u6df7\u4e71\uff0c\u540c\u6837\u7684\u4e00\u4e2a\u6982\u5ff5\uff0c\u5728\u4e00\u7bc7\u535a\u5ba2\u4e2d\u662f\u8fd9\u79cd\u8bf4\u6cd5\uff0c\u5728\u53e6\u4e00\u7bc7\u535a\u5ba2\u4e2d\u53c8\u53d8\u6210\u4e86\u53e6\u5916\u4e00\u79cd\u8bf4\u6cd5\uff0c\u8d8a\u770b\u8d8a\u6210\u4e86\u4e00\u56e2\u4e71\u9ebb\uff01
\n3.\u672c\u6587\u8bd5\u7740\u53bb\u7efc\u5408\u4e00\u4e0b\u591a\u7bc7\u535a\u5ba2\u4e2d\u7684\u8fd9\u4e9b\u6982\u5ff5\uff0c\u5e76\u5c1d\u8bd5\u53bb\u7406\u987a\u8fd9\u4e9b\u6982\u5ff5\u95f4\u7684\u590d\u6742\u5173\u7cfb\uff0c\u5982\u6709\u9519\u8bef\uff0c\u6b22\u8fce\u6307\u6b63\uff01<\/p><\/blockquote>\n

\u58f0\u660e: \u672c\u4eba\u5728\u7f51\u4e0a\u770b\u5230\u5982\u4e0b\u5730\u5740\u7684\u8fd9\u7bc7\u535a\u5ba2\u65f6\uff0c\u5bf9\u5176\u4e2d\u8bf8\u591a\u6982\u5ff5\u7684\u8bb2\u89e3\u7279\u522b\u6b23\u8d4f\uff0c\u6240\u4ee5\u5728\u6b64\u6587\u5c06\u5f15\u7528\u8fd9\u4e9b\u5185\u5bb9\uff0c\u5982\u8bfb\u8005\u770b\u5230\u672a\u6807\u6ce8\u5f15\u7528\u5730\u5740\u7684\u5f15\u7528\u5185\u5bb9\uff0c\u5747\u51fa\u81ea\u4e8e\u6b64\u7bc7\u6587\u6863\uff0c\u5728\u6b64\u4e5f\u611f\u8c22\u8fd9\u7bc7\u535a\u5ba2\u7684\u4f5c\u8005\u7684\u6e05\u6670\u8bb2\u89e3\uff0c\u8ba9\u6211\u53d7\u76ca\u65e0\u7a77\uff01\uff01\uff01<\/strong>
\n\u81f4\u6b49\uff1a\u7531\u4e8e\u672c\u4eba\u672a\u53ca\u65f6\u8bb0\u5f55\u6240\u6709\u53c2\u9605\u8fc7\u7684\u535a\u5ba2\uff0c\u6545\u53ea\u80fd\u5c06\u5176\u4e2d\u90e8\u5206\u535a\u5ba2\u5730\u5740\u5217\u4e8e\u6587\u7ae0\u6700\u540e\uff0c\u5bf9\u5176\u4ed6\u53c2\u9605\u8fc7\u4f46\u672a\u5217\u51fa\u5730\u5740\u7684\u535a\u5ba2\u53ca\u5176\u4f5c\u8005\u8868\u793a\u6b49\u610f\u3002<\/strong><\/p>\n

\u53c2\u8003\u6587\u6863\uff1ahttp:\/\/www.cnblogs.com\/2050\/p\/3877280.html<\/a><\/p>\n

<\/a>\u4e00 \u50cf\u7d20\u77e5\u8bc6<\/h1>\n

<\/a>1.1 \u8bbe\u5907\u50cf\u7d20(device pixel)<\/h2>\n

\u5b83\u662f\u7269\u7406\u6982\u5ff5\uff0c\u6307\u7684\u662f\u8bbe\u5907\u4e2d\u4f7f\u7528\u7684\u7269\u7406\u50cf\u7d20(Physic pixel)\u3002\u8fd9\u4e2a\u5355\u4f4d\u7528px\u8868\u793a\uff0c\u5b83\u662f\u4e00\u4e2a[\u76f8\u5bf9\u7edd\u5bf9\u5355\u4f4d]<\/strong>\u2014\u2014\u2014\u2014
\n\u5373\u5728\u540c\u6837\u4e00\u4e2a\u8bbe\u5907\u4e0a\uff0c\u6bcf1\u4e2a\u8bbe\u5907\u50cf\u7d20\u6240\u4ee3\u8868\u7684\u7269\u7406\u957f\u5ea6(\u5982\u82f1\u5bf8)\u662f\u56fa\u5b9a\u4e0d\u53d8\u7684(\u5373\u8bbe\u5907\u50cf\u7d20\u7684\u7edd\u5bf9\u6027<\/strong>);
\n\u4f46\u5728\u4e0d\u540c\u7684\u8bbe\u5907\u4e4b\u95f4\uff0c\u6bcf1\u4e2a\u8bbe\u5907\u50cf\u7d20\u6240\u4ee3\u8868\u7684\u7269\u7406\u957f\u5ea6(\u5982\u82f1\u5bf8)\u662f\u53ef\u4ee5\u53d8\u5316\u7684(\u5373\u8bbe\u5907\u50cf\u7d20\u7684\u76f8\u5bf9\u6027<\/strong>);<\/p>\n

\u6211\u4eec\u6240\u8bf4\u7684\u8bbe\u5907\u5206\u8fa8\u7387\u7684\u5355\u4f4d\u5c31\u662f\u8bbe\u5907\u50cf\u7d20\u3002<\/p>\n

\u6709\u4e86\u8bbe\u5907\u50cf\u7d20\u6982\u5ff5\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u89e3\u91ca\u4e0b\u8868\u4e2d\uff1a\u4e0d\u540c\u82f1\u5bf8\u5927\u5c0f\u7684\u79fb\u52a8\u8bbe\u5907\u4e0a\uff0c\u5206\u8fa8\u7387\u5374\u76f8\u540c\u7684\u539f\u56e0\u4e86\u2014\u2014\u2014\u2014\u56e0\u4e3a\u8bbe\u5907\u50cf\u7d20\u7684\u76f8\u5bf9\u6027<\/strong><\/p>\n\n\n\n\n\n\n\n
\u624b\u673a\u7c7b\u578b<\/th>\n\u534e\u4e3a\u8363\u80008<\/th>\nIPhone6S Plus<\/th>\n<\/tr>\n<\/thead>\n
\u5c4f\u5e55\u5c3a\u5bf8<\/td>\n5.2\u82f1\u5bf8<\/td>\n5.5 \u82f1\u5bf8<\/td>\n<\/tr>\n
\u5206\u8fa8\u7387<\/td>\n1920×1080<\/td>\n1920 x 1080<\/td>\n<\/tr>\n
PPI<\/td>\n423<\/td>\n401<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u6ce8\uff1a\u8868\u683c\u4e2d\u7684\u6570\u636e\u6765\u6e90
\n\u534e\u4e3a\u8363\u80008\uff1ahttp:\/\/www.vmall.com\/product\/938665621.html<\/a>
\nIPhone6S Plus:https:\/\/www.apple.com\/cn\/iphone-6s\/specs\/<\/a><\/p>\n

<\/a>1.1.1 \u8bbe\u5907\u5206\u8fa8\u7387<\/h3>\n

\u8bbe\u5907\u5206\u8fa8\u7387\u7684\u5355\u4f4d\u5c31\u662f\u8bbe\u5907\u50cf\u7d20(px)\u3002<\/p>\n

\u63d0\u5230\u8bbe\u5907\u5206\u8fa8\u7387\uff0c\u987a\u4fbf\u5f15\u7528\u5982\u4e0b\u5730\u5740\u7684\u535a\u5ba2\u8bf4\u660e\u4e00\u4e0b\uff1a
\nhttp:\/\/www.chinaz.com\/manage\/2015\/0902\/441624.shtml<\/a><\/p>\n

\u5728\u540c\u4e00\u4e2a\u624b\u673a\u6216\u7535\u8111\u8bbe\u5907\u4e0a\uff0c\u5b83\u7684\u8bbe\u5907\u50cf\u7d20\u662f\u56fa\u5b9a\u7684\uff0c\u8fd9\u662f\u5382\u5546\u5728\u51fa\u5382\u65f6\u5c31\u8bbe\u7f6e\u597d\u4e86\u7684\u2014\u2014\u2014\u2014\u5373\u4e00\u4e2a\u8bbe\u5907\u7684\u5206\u8fa8\u7387\u662f\u56fa\u5b9a\u4e0d\u53d8\u7684\u3002<\/p><\/blockquote>\n

\u6240\u4ee5\u53ef\u4ee5\u8c03\u6574\u7535\u8111\u5c4f\u5e55\u7684\u5206\u8fa8\u7387(\u624b\u673a\u5c31\u6ca1\u8fd9\u4e2a\u529f\u80fd\uff01)\uff1f\u90a3\u53ea\u662f\u4f60\u7684\u773c\u775b\u5728\u6b3a\u9a97\u4f60\uff0c\u5177\u4f53\u539f\u56e0\u8bf7\u89c1\uff1a
\nhttp:\/\/www.chinaz.com\/manage\/2015\/0902\/441624.shtml<\/a> <\u7535\u8111\u5c4f\u5e55\u53ef\u4ee5\u8c03\u5206\u8fa8\u7387\uff0c\u96be\u9053\u662f\u901a\u8fc7\u8c03\u6574\u5b83\u7684\u50cf\u7d20\u5927\u5c0f\u5b9e\u73b0\u7684\uff1f>\u4e00\u8282<\/p>\n

<\/a>1.2 CSS\u50cf\u7d20(css pixel)<\/h2>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u8bbe\u5907\u50cf\u7d20\u548cCSS\u50cf\u7d20\u4e00\u822c\u4f7f\u7528px\u4f5c\u4e3a\u5355\u4f4d\uff0c\u5e76\u4e14\u5728\u684c\u9762\u6d4f\u89c8\u5668\u7684100%\u7f29\u653e\u60c5\u51b5\u4e0b\uff0ccss\u76841\u4e2a\u50cf\u7d20\u5f80\u5f80\u90fd\u662f\u5bf9\u5e94\u7740\u7535\u8111\u5c4f\u5e55\u76841\u4e2a\u7269\u7406\u50cf\u7d20\uff0c\u8fd9\u53ef\u80fd\u4f1a\u9020\u6210\u6211\u4eec\u7684\u4e00\u4e2a\u9519\u89c9\uff0c\u90a3\u5c31\u662fcss\u4e2d\u7684\u50cf\u7d20\u5c31\u662f\u8bbe\u5907\u7684\u7269\u7406\u50cf\u7d20\u3002
\n\u4f46\u5b9e\u9645\u60c5\u51b5\u5374\u5e76\u975e\u5982\u6b64\uff0ccss\u50cf\u7d20\u53ea\u662f\u4e00\u4e2a\u62bd\u8c61\u7684\u5355\u4f4d\uff0c\u5728\u4e0d\u540c\u7684\u8bbe\u5907\u6216\u4e0d\u540c\u7684\u73af\u5883\u4e2d\uff0ccss\u4e2d\u76841px\u6240\u4ee3\u8868\u7684\u8bbe\u5907\u7269\u7406\u50cf\u7d20\u7684\u957f\u5ea6\u662f\u4e0d\u540c\u7684\u3002
\n\u5728\u4e3a\u684c\u9762\u6d4f\u89c8\u5668\u8bbe\u8ba1\u7684\u7f51\u9875\u4e2d\uff0c\u6211\u4eec\u65e0\u9700\u5bf9\u8fd9\u4e2a\u6d25\u6d25\u8ba1\u8f83\uff0c\u4f46\u5728\u79fb\u52a8\u8bbe\u5907\u4e0a\uff0c\u5fc5\u987b\u5f04\u660e\u767d\u8fd9\u70b9\u3002<\/p><\/blockquote>\n

\u4e0a\u8ff0\u8bba\u8ff0\u5f97\u5230\u5982\u4e0b\u7ed3\u8bba\uff1a<\/p>\n

css\u4e2d\u76841px\u5e76\u4e0d\u662f\u603b\u4ee3\u8868\u8bbe\u5907\u50cf\u7d20\u4e0a\u76841px\uff0c\u5c24\u5176\u662f\u5728\u79fb\u52a8\u8bbe\u5907\u4e0a\u3002<\/p><\/blockquote>\n

CSS\u50cf\u7d20\u662fWeb\u7f16\u7a0b\u7684\u6982\u5ff5\uff0c\u6307\u7684\u662fCSS\u6837\u5f0f\u4ee3\u7801\u4e2d\u4f7f\u7528\u7684\u903b\u8f91\u50cf\u7d20\u3002\u5b83\u662f\u4e00\u4e2a[\u7eaf\u76f8\u5bf9\u5355\u4f4d]<\/strong>\u2014\u2014\u2014\u2014
\n\u5728\u540c\u6837\u4e00\u4e2a\u8bbe\u5907\u4e0a\uff0c\u6bcf1\u4e2aCSS\u50cf\u7d20\u6240\u4ee3\u8868\u7684\u7269\u7406\u50cf\u7d20\u662f\u53ef\u4ee5\u53d8\u5316\u7684(\u5373CSS\u50cf\u7d20\u7684\u7b2c\u4e00\u65b9\u9762\u7684\u76f8\u5bf9\u6027<\/strong>);
\n\u5728\u4e0d\u540c\u7684\u8bbe\u5907\u4e4b\u95f4\uff0c\u6bcf1\u4e2aCSS\u50cf\u7d20\u6240\u4ee3\u8868\u7684\u7269\u7406\u50cf\u7d20\u662f\u53ef\u4ee5\u53d8\u5316\u7684(\u5373CSS\u50cf\u7d20\u7684\u7b2c\u4e8c\u65b9\u9762\u7684\u76f8\u5bf9\u6027<\/strong>);<\/p>\n

\u4ece\u4e0a\u8ff0\u5b9a\u4e49\u53ef\u4ee5\u770b\u51fa\uff1a<\/p>\n

CSS\u50cf\u7d20\u662f\u4e00\u4e2a\u76f8\u5bf9\u5355\u4f4d\uff0c\u76f8\u5bf9\u7684\u662f\u8bbe\u5907\u50cf\u7d20(device pixel)\u3002
\n(\u539f\u6587\u5730\u5740\uff1ahttp:\/\/www.jianshu.com\/p\/af6dad66e49a<\/a>)<\/p><\/blockquote>\n

<\/a>1.2.1 \u7f29\u653e<\/h3>\n

\u5f15\u7528PPK\u5927\u795e\u7684\u8bba\u8ff0\u6765\u8bf4\u660e\u4e00\u4e0b\u7f29\u653e\u7684\u539f\u7406\uff1a<\/p>\n

Zooming as implemented in modern browsers consists of nothing more than \u201cstretching up\u201d pixels. That is, the width of the element is not changed from 128 to 256 pixels; instead the actual pixels are doubled in size. Formally, the element still has a width of 128 CSS pixels, even though it happens to take the space of 256 device pixels. (\u539f\u6587\u7f51\u5740\uff1ahttp:\/\/www.quirksmode.org\/mobile\/viewports.html<\/a>)<\/p><\/blockquote>\n

\u8bd1\u6587\uff1a
\n\u73b0\u4ee3\u6d4f\u89c8\u5668\u4e2d\u5b9e\u73b0\u7f29\u653e\u7684\u65b9\u5f0f\u90fd\u662f\u300c\u62c9\u4f38\u300d\u50cf\u7d20(\u5373\u6bcfCSS\u50cf\u7d20\u5355\u4f4d\u4ee3\u8868\u7684\u957f\u5ea6\u53d1\u751f\u53d8\u5316\uff0c\u800c\u50cf\u7d20\u603b\u6570\u5b57\u4e0d\u53d8)\u3002(\u5982\u679c\u5c06\u4e00\u4e2a\u5143\u7d20\u4e3a128px\u7684\u5143\u7d20\u653e\u5927\u4e00\u500d, \u8bd1\u8005\u6ce8)\u5143\u7d20\u7684\u5bbd\u5ea6\u5e76\u6ca1\u6709\u4ece128px\u53d8\u5230256px\uff0c\u4e8b\u5b9e\u4e0a\u53ea\u662f\u201c\u5b9e\u9645\u50cf\u7d20\u201d\u53d8\u4e3a2\u500d\u5927\u5c0f(\u5373256px)\uff0c\u800c\u5f62\u5f0f\u4e0a\u8fd9\u4e2a\u5143\u7d20\u7684\u5bbd\u5ea6\u8fd8\u662f128px\uff0c\u5c3d\u7ba1\u5b83\u5df2\u7ecf\u5360\u636e\u4e86256\u4e2a\u8bbe\u5907\u50cf\u7d20\u7684\u7a7a\u95f4\u3002<\/p>\n

\u6240\u4ee5\uff0c\u6211\u4eec\u53ef\u4ee5\u5f97\u5230\u5982\u4e0b\u7ed3\u8bba\uff1a<\/p>\n

\u7f29\u653e\u4f1a\u5f15\u8d77CSS\u50cf\u7d20\u7684\u53d8\u5316\u2014\u2014\u5373\u5f15\u8d77\u6bcf1\u4e2aCSS\u50cf\u7d20\u6240\u4ee3\u8868\u7684\u7269\u7406\u50cf\u7d20\u53d8\u5316\u3002\u4f8b\u5982\uff0c\u5f53\u7528\u6237\u628a\u9875\u9762\u653e\u5927\u4e00\u500d\uff0c\u90a3\u4e48css\u4e2d1px\u6240\u4ee3\u8868\u7684\u7269\u7406\u50cf\u7d20\u4e5f\u4f1a\u589e\u52a0\u4e00\u500d\uff1b\u53cd\u4e4b\u628a\u9875\u9762\u7f29\u5c0f\u4e00\u500d\uff0ccss\u4e2d1px\u6240\u4ee3\u8868\u7684\u7269\u7406\u50cf\u7d20\u4e5f\u4f1a\u51cf\u5c11\u4e00\u500d\u3002<\/p><\/blockquote>\n

\u6240\u4ee5\uff0c\u6709\u4e0a\u8ff0\u63cf\u8ff0\uff0c\u6211\u4eec\u53ef\u4ee5\u5f97\u5230\u5982\u4e0b\u7ed3\u8bba\uff1a<\/p>\n

\u9875\u9762\u7f29\u653e\u6bd4\u4f8b = \u7269\u7406\u50cf\u7d20\/CSS\u50cf\u7d20<\/strong><\/p>\n

<\/a>1.3 DPI&PPI<\/h2>\n

\u5f15\u7528 http:\/\/weizhifeng.net\/you-should-know-about-dpi.html<\/a> \u4e2d\u5173\u4e8eDPI\u548cPPI\u7684\u5b9a\u4e49\u5982\u4e0b\uff1a<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0DPI(dots per inch)\u4e3a\u6253\u5370\u673a\u6bcf\u82f1\u5bf8\u53ef\u4ee5\u55b7\u7684\u58a8\u6c41\u70b9\u6570\uff0c\u7528\u4e8e\u5370\u5237\u884c\u4e1a\u4e2d\u5ea6\u91cf\u7a7a\u95f4\u70b9\u7684\u5bc6\u5ea6
\nPPI(pixels per inch)\u4e3a\u5c4f\u5e55\u6bcf\u82f1\u5bf8\u7684\u50cf\u7d20\u6570\u91cf(\u5373\u5728\u4e00\u4e2a\u5bf9\u89d2\u7ebf\u957f\u5ea6\u4e3a1\u82f1\u5bf8\u7684\u6b63\u65b9\u5f62\u5185\u6240\u62e5\u6709\u7684\u50cf\u7d20\u6570)\uff0c\u7528\u4e8e\u5ea6\u91cf\u8ba1\u7b97\u673a\u663e\u793a\u5c4f\u4e0a\u50cf\u7d20\u7684\u5bc6\u5ea6
\n\u76ee\u524dPPI(\u4e3b\u8981\u662fiOS)\u548cDPI(\u6bd4\u5982\u5728Android\u4e2d)\u90fd\u4f1a\u7528\u5728\u8ba1\u7b97\u673a\u663e\u793a\u8bbe\u5907\u7684\u53c2\u6570\u63cf\u8ff0\u4e2d\uff0c\u5e76\u4e14\u4e8c\u8005\u7684\u610f\u601d\u662f\u4e00\u6837\u7684\uff0c\u90fd\u662f\u4ee3\u8868\u50cf\u5c4f\u5e55\u7d20\u5bc6\u5ea6<\/p><\/blockquote>\n

\u5c4f\u5e55\u50cf\u7d20\u5bc6\u5ea6\uff0c\u5c4f\u5e55\u5206\u8fa8\u7387\uff0c\u5c4f\u5e55\u5c3a\u5bf8\u4e09\u8005\u7684\u5173\u7cfb\u5982\u4e0b\uff1a
\n
\n\u6ce8\uff1a\u4e0a\u56fe\u516c\u5f0f\u4e2d\uff0c\u5982\u5206\u8fa8\u7387\u4e3a1920px*1080px\uff0c\u52191920px\u5c31\u662f\u516c\u5f0f\u91cc\u7684\u7eb5\u5411\uff0c1080px\u5c31\u662f\u516c\u5f0f\u91cc\u7684\u6a2a\u5411\u4e86<\/strong><\/p>\n

<\/a>1.4 DPR<\/h2>\n

\u5168\u79f0\u8bbe\u5907\u50cf\u7d20\u6bd4(Device Pixel Ratio\uff09\u3002\u5148\u7ed9\u51fa\u5176\u5b98\u65b9\u5b9a\u4e49\uff1a<\/p>\n

\u5728\u79fb\u52a8\u7aef\u6d4f\u89c8\u5668\u4e2d\u4ee5\u53ca\u67d0\u4e9b\u684c\u9762\u6d4f\u89c8\u5668\u4e2d\uff0cwindow\u5bf9\u8c61\u6709\u4e00\u4e2adevicePixelRatio\u5c5e\u6027\uff0c\u5b83\u7684\u5b98\u65b9\u7684\u5b9a\u4e49\u4e3a\uff1a\u8bbe\u5907\u7269\u7406\u50cf\u7d20\u548c\u8bbe\u5907\u72ec\u7acb\u50cf\u7d20\u7684\u6bd4\u4f8b\uff0c\u4e5f\u5c31\u662f devicePixelRatio = \u7269\u7406\u50cf\u7d20 \/ \u72ec\u7acb\u50cf\u7d20\u3002<\/p><\/blockquote>\n

\u7531\u4e0a\u8ff0\u516c\u5f0f\u8ba1\u7b97\u51fappi\u662f\u4e3a\u4e86\u5f97\u5230\u5bc6\u5ea6\u5206\u754c\uff0c\u83b7\u5f97\u9ed8\u8ba4\u7f29\u653e\u6bd4\u4f8b\uff0c\u5373\u8bbe\u5907\u50cf\u7d20\u6bd4\u2013dpr<\/p>\n

\u5b89\u5353\u7684\u8bbe\u5907\u50cf\u7d20\u6bd4\u5982\u4e0b\uff1a<\/p>\n

<\/p>\n

\u7531\u4e0a\u56fe\u53ef\u77e5\uff0cppi\u5728120-160\u4e4b\u95f4\u7684\u624b\u673a\u88ab\u5f52\u4e3a\u4f4e\u5bc6\u5ea6\u624b\u673a\uff0c160-240\u88ab\u5f52\u4e3a\u4e2d\u5bc6\u5ea6\uff0c240-320\u88ab\u5f52\u4e3a\u9ad8\u5bc6\u5ea6\uff0c320\u4ee5\u4e0a\u88ab\u5f52\u4e3a\u8d85\u9ad8\u5bc6\u5ea6\uff08Apple\u7ed9\u4e86\u5b83\u4e00\u4e2a\u9ad8\u5927\u4e0a\u7684\u540d\u5b57\u2014\u2014Retina\uff09
\n(\u539f\u6587\u5730\u5740\uff1ahttp:\/\/www.jianshu.com\/p\/af6dad66e49a<\/a>)<\/p><\/blockquote>\n

\u83b7\u53d6\u82f9\u679c\u7684\u8bbe\u5907\u50cf\u7d20\u6bd4\u6bd4\u8f83\u7b80\u5355\uff1a<\/p>\n

\u5148\u89c4\u5b9a\u5bc6\u5ea6\u5206\u754c\u57fa\u6570\u4e3a160\uff0c\u7136\u540e\u8bbe\u5907\u50cf\u7d20\u6bd4=PPI\u9664\u4ee5\u5bc6\u5ea6\u5206\u754c\u57fa\u6570160<\/strong><\/p>\n

<\/a>1.5 DPR\u4e0ePPI\u7684\u5173\u7cfb<\/h2>\n

\u7efc\u5408\u4e0a\u8ff0\u5b89\u5353\u548c\u82f9\u679c\u7684\u5bc6\u5ea6\u5206\u754c\u56fe\uff0c\u53ef\u4ee5\u5f97\u5230\u7684DPR\u4e0ePPI\u7684\u5173\u7cfb\u5982\u4e0b\uff1a<\/p>\n

DPR = PPI\/160<\/strong><\/p>\n

<\/a>1.6 \u8bbe\u5907\u50cf\u7d20\u4e0eCSS\u50cf\u7d20\u4e4b\u95f4\u7684\u5173\u7cfb<\/h2>\n

\u83b7\u5f97\u8bbe\u5907\u50cf\u7d20\u6bd4\uff08dpr\uff09\u540e\uff0c\u4fbf\u53ef\u5f97\u77e5\u8bbe\u5907\u50cf\u7d20\u4e0eCSS\u50cf\u7d20\u4e4b\u95f4\u7684\u6bd4\u4f8b\u3002\u5f53\u8fd9\u4e2a\u6bd4\u7387\u4e3a1:1\u65f6\uff0c\u4f7f\u75281\u4e2a\u8bbe\u5907\u50cf\u7d20\u663e\u793a1\u4e2aCSS\u50cf\u7d20\u3002\u5f53\u8fd9\u4e2a\u6bd4\u7387\u4e3a2:1\u65f6\uff0c\u4f7f\u75284\u4e2a\u8bbe\u5907\u50cf\u7d20\u663e\u793a1\u4e2aCSS\u50cf\u7d20\uff0c\u5f53\u8fd9\u4e2a\u6bd4\u7387\u4e3a3:1\u65f6\uff0c\u4f7f\u75289\uff083*3\uff09\u4e2a\u8bbe\u5907\u50cf\u7d20\u663e\u793a1\u4e2aCSS\u50cf\u7d20\u3002<\/p>\n

\u6240\u4ee5\uff0c\u6709\u5982\u4e0b\u516c\u5f0f\uff1a<\/p>\n

DPR = \u8bbe\u5907\u50cf\u7d20\/CSS\u50cf\u7d20<\/strong><\/p>\n

<\/a>1.7 \u8bbe\u5907\u72ec\u7acb\u50cf\u7d20(Device independent Pixel)\uff0c\u4e5f\u79f0\u4e3a\u903b\u8f91\u50cf\u7d20\uff0c\u7b80\u79f0dip<\/h2>\n

\u6839\u636e\u4e0a\u8ff0\u8bbe\u5907\u50cf\u7d20\u4e0eCSS\u50cf\u7d20\u4e4b\u95f4\u7684\u5173\u7cfb\u3001\u53caDPR\u7684\u5b98\u65b9\u5b9a\u4e49\uff0c\u6211\u4eec\u53ef\u4ee5\u63a8\u65ad\u51fa\uff1a<\/p>\n

CSS\u50cf\u7d20 =\u8bbe\u5907\u72ec\u7acb\u50cf\u7d20 = \u903b\u8f91\u50cf\u7d20<\/strong><\/p>\n

\u4e0b\u9762\uff0c\u8fd8\u662f\u5f15\u7528 http:\/\/www.cnblogs.com\/2050\/p\/3877280.html<\/a> \u6587\u4e2d\u7684\u5185\u5bb9\u8bf4\u660e\uff1a<\/p>\n

\u5728\u79fb\u52a8\u7aef\u6d4f\u89c8\u5668\u4e2d\u4ee5\u53ca\u67d0\u4e9b\u684c\u9762\u6d4f\u89c8\u5668\u4e2d\uff0cwindow\u5bf9\u8c61\u6709\u4e00\u4e2adevicePixelRatio\u5c5e\u6027\uff0c\u5b83\u7684\u5b98\u65b9\u7684\u5b9a\u4e49\u4e3a\uff1a\u8bbe\u5907\u7269\u7406\u50cf\u7d20\u548c\u8bbe\u5907\u72ec\u7acb\u50cf\u7d20\u7684\u6bd4\u4f8b\uff0c\u4e5f\u5c31\u662f devicePixelRatio = \u7269\u7406\u50cf\u7d20 \/ \u72ec\u7acb\u50cf\u7d20\u3002
\nCSS\u50cf\u7d20\u5c31\u53ef\u4ee5\u770b\u505a\u662f\u8bbe\u5907\u7684\u72ec\u7acb\u50cf\u7d20\uff0c\u6240\u4ee5\u901a\u8fc7devicePixelRatio\uff0c\u6211\u4eec\u53ef\u4ee5\u77e5\u9053\u8be5\u8bbe\u5907\u4e0a\u4e00\u4e2acss\u50cf\u7d20\u4ee3\u8868\u591a\u5c11\u4e2a\u7269\u7406\u50cf\u7d20\u3002\u4f8b\u5982\uff0c\u5728Retina\u5c4f\u7684iphone\u4e0a\uff0cdevicePixelRatio\u7684\u503c\u4e3a2\uff0c\u4e5f\u5c31\u662f\u8bf41\u4e2acss\u50cf\u7d20\u76f8\u5f53\u4e8e2\u4e2a\u7269\u7406\u50cf\u7d20\u3002\u4f46\u662f\u8981\u6ce8\u610f\u7684\u662f\uff0cdevicePixelRatio\u5728\u4e0d\u540c\u7684\u6d4f\u89c8\u5668\u4e2d\u8fd8\u5b58\u5728\u4e9b\u8bb8\u7684\u517c\u5bb9\u6027\u95ee\u9898\uff0c\u6240\u4ee5\u6211\u4eec\u73b0\u5728\u8fd8\u5e76\u4e0d\u80fd\u5b8c\u5168\u4fe1\u8d56\u8fd9\u4e2a\u4e1c\u897f\uff0c\u5177\u4f53\u7684\u60c5\u51b5\u53ef\u4ee5\u770b\u4e0b\u8fd9\u7bc7\u6587\u7ae0<\/a><\/p><\/blockquote>\n

<\/a>\u4e8c Viewport\u77e5\u8bc6<\/h1>\n

\u5173\u4e8eviewport\u7684\u77e5\u8bc6\uff0c\u4e3b\u8981\u53c2\u9605\u4e86\u5982\u4e0b7\u7bc7\u535a\u5ba2\uff1a
\nPPK\u5927\u795e\u5173\u4e8eViewport\u7684\u4e09\u7bc7\u7814\u7a76\u6587\u7ae0\uff1a
\nhttp:\/\/www.quirksmode.org\/mobile\/viewports2.html<\/a>
\nhttp:\/\/www.quirksmode.org\/mobile\/viewports.html<\/a>
\nhttp:\/\/www.quirksmode.org\/mobile\/metaviewport\/#t10<\/a>
\n\u4ee5\u53ca\u4e0a\u8ff0\u4e09\u7bc7\u6587\u7ae0\u7684\u8bd1\u6587\uff1a
\nhttp:\/\/weizhifeng.net\/viewports2.html<\/a>
\nhttp:\/\/weizhifeng.net\/viewports.html<\/a>
\nhttp:\/\/blog.csdn.net\/aiolos1111\/article\/details\/51919795<\/a>
\n\u4ee5\u53ca\u672c\u6587\u5f00\u5934\u63d0\u5230\u7684\u535a\u5ba2\uff1a
\nhttp:\/\/www.cnblogs.com\/2050\/p\/3877280.html<\/a><\/p>\n

\u9996\u5148\u5f15\u7528PPK\u6587\u7ae0\u4e2d\u7684\u8bf4\u660e\u6765\u89e3\u91ca\u4e00\u4e0b\u4ec0\u4e48\u662fViewport<\/p>\n

George Cummins explains the basic concept best here at Stack Overflow:<\/p>\n

\u201c
\nImagine the layout viewport as being a large image which does not change size or shape. Now image you have a smaller frame through which you look at the large image. The small frame is surrounded by opaque material which obscures your view of all but a portion of the large image. The portion of the large image that you can see through the frame is the visual viewport. You can back away from the large image while holding your frame (zoom out) to see the entire image at once, or you can move closer (zoom in) to see only a portion. You can also change the orientation of the frame, but the size and shape of the large image (layout viewport) never changes.
\n\u201d<\/p>\n

See also this explanation by Chris.<\/p>\n

The visual viewport is the part of the page that\u2019s currently shown on-screen. The user may scroll to change the part of the page he sees, or zoom to change the size of the visual viewport.
\n\uff08\u539f\u6587\u5730\u5740\uff1ahttp:\/\/www.quirksmode.org\/mobile\/viewports2.html<\/a>\uff09<\/p><\/blockquote>\n

\u8bd1\u6587\uff1a<\/p>\n

George Cummins\u5728Stack Overflow\u4e0a\u5bf9\u57fa\u672c\u6982\u5ff5\u7ed9\u51fa\u4e86\u6700\u4f73\u89e3\u91ca\uff1a
\n\u628alayout viewport\u60f3\u50cf\u6210\u4e3a\u4e00\u5f20\u65e0\u6cd5\u6539\u53d8\u5927\u5c0f\u6216\u5f62\u72b6\u7684\u5927\u56fe\u3002\u73b0\u5728\u60f3\u50cf\u4f60\u6709\u4e00\u4e2a\u5c0f\u4e00\u4e9b\u7684\u6846\u67b6\uff0c\u4f60\u901a\u8fc7\u5b83\u6765\u770b\u8fd9\u5f20\u5927\u56fe\u3002\u8fd9\u4e2a\u5c0f\u6846\u67b6\u7684\u5468\u56f4\u5305\u88f9\u7740\u4e0d\u900f\u660e\u6750\u6599\uff0c\u63a9\u76d6\u4e86\u4f60\u6240\u6709\u7684\u89c6\u7ebf\uff0c\u4f60\u53ea\u80fd\u770b\u5230\u8fd9\u5f20\u5927\u56fe\u7684\u4e00\u90e8\u5206\u3002\u4f60\u901a\u8fc7\u8fd9\u4e2a\u6846\u67b6\u6240\u80fd\u770b\u5230\u7684\u5927\u56fe\u7684\u4e00\u90e8\u5206\u5c31\u662fvisual viewport\u3002\u4f60\u53ef\u4ee5\u540e\u62c9(\u653e\u5927)\u6846\u67b6\u4ee5\u89c2\u770b\u6574\u4e2a\u56fe\u7247\uff0c\u6216\u8005\u4f60\u53ef\u4ee5\u9760\u8fd1\u4e00\u4e9b\uff08\u7f29\u5c0f\u6846\u67b6\uff09\u53ea\u770b\u5c40\u90e8\u3002\u4f60\u4e5f\u53ef\u4ee5\u6539\u53d8\u6846\u67b6\u7684\u65b9\u5411\uff0c\u4f46\u662f\u5927\u56fe\uff08layout viewport\uff09\u7684\u5927\u5c0f\u548c\u5f62\u72b6\u6c38\u8fdc\u4e0d\u4f1a\u53d8\u3002<\/p>\n

Chris\u7ed9\u51fa\u7684\u5173\u4e8eVisual viewport\u7684\u89e3\u91ca\uff1a
\nvisual viewport\u662f\u9875\u9762\u663e\u793a\u5728\u5f53\u524d\u5c4f\u5e55\u4e0a\u7684\u90a3\u4e00\u90e8\u5206\u3002\u7528\u6237\u53ef\u4ee5\u901a\u8fc7\u6eda\u52a8\u6765\u6539\u53d8\u4ed6\u6240\u770b\u5230\u7684\u9875\u9762\u7684\u90e8\u5206\uff0c\u6216\u8005\u901a\u8fc7\u7f29\u653e\u6765\u6539\u53d8visual viewport\u7684\u5927\u5c0f\u3002
\n\uff08\u539f\u6587\u5730\u5740\uff1ahttp:\/\/blog.csdn.net\/aiolos1111\/article\/details\/51956691<\/a>\uff09<\/p><\/blockquote>\n

\u4e0b\u9762\u4ee5\u6211\u81ea\u5df1\u7684\u7406\u89e3\u89e3\u91ca\u4e00\u4e0b\u4ec0\u4e48\u662fViewport\uff1a<\/p>\n

1\u3001Viewport\u5c31\u662f\u79fb\u52a8\u8bbe\u5907\u6d4f\u89c8\u5668\u4e0a(\u4e5f\u53ef\u80fd\u662f\u4e00\u4e2aapp\u4e2d\u7684webview)\u7528\u6765\u663e\u793a\u7f51\u9875\u7684\u4e00\u5757\u201c\u753b\u5e03\u201d\u3002<\/p>\n

2\u3001\u79fb\u52a8\u8bbe\u5907\u4e0a\u7684\u9875\u9762\u662f\u663e\u793a\u5728Viewport\u4e0a\u7684\u3002<\/p>\n

3\u3001\u79fb\u52a8\u8bbe\u5907\u7684\u6d4f\u89c8\u5668\u90fd\u6709viewport\u5143\u6807\u7b7e\uff0c\u800c\u5f15\u5165viewport\u7684\u76ee\u7684\u5c31\u662f\u7528\u4e8e\u89e3\u51b3PC\u9875\u9762\u80fd\u5728\u624b\u673a\u4e0a\u6b63\u5e38\u663e\u793a\uff0c\u4e0d\u4f1a\u56e0\u5c4f\u5e55\u53d8\u5c0f\u800c\u6324\u538b\u5e03\u5c40\u5bfc\u81f4\u9875\u9762\u6392\u7248\u6df7\u4e71\u7684\u95ee\u9898\u3002<\/p>\n

4\u3001\u5728\u5f15\u5165\u4e86Viewport\u6982\u5ff5\u5e76\u505a\u5982\u4e0b\u89c4\u5b9a\u540e\uff0c\u5c31\u4e0d\u4f1a\u7834\u574f\u90a3\u4e9b\u6ca1\u6709\u9488\u5bf9\u624b\u673a\u6d4f\u89c8\u5668\u4f18\u5316\u7684PC\u7f51\u9875\u7684\u5e03\u5c40\uff0c\u7528\u6237\u53ef\u4ee5\u901a\u8fc7\u5e73\u79fb\u548c\u7f29\u653e\u6765\u770b\u7f51\u9875\u7684\u5176\u4ed6\u90e8\u5206\u3002<\/p>\n

\u79fb\u52a8\u8bbe\u5907\u4e0a\u7684layout viewport\u7684\u5bbd\u6c38\u5927\u7b49\u4e8e\u53ef\u89c6\u533a\u57df(Visual viewport)\u7684\u5bbd
\n\uff08\u539f\u6587\u5730\u5740\uff1ahttp:\/\/www.quirksmode.org\/mobile\/metaviewport\/#t10<\/a> \uff09<\/p><\/blockquote>\n

5\u3001PPK\u5927\u795e\u5bf9\u4e8e\u79fb\u52a8\u8bbe\u5907\u4e0a\u7684viewport\u6709\u7740\u975e\u5e38\u591a\u7684\u7814\u7a76\uff0c\u4ed6\u8ba4\u4e3a\u79fb\u52a8\u8bbe\u5907\u4e0a\u6709\u4e09\u4e2aviewport\uff1alayout viewport \u3001 visual viewport \u548c ideal viewport\u3002<\/p>\n

\u4e0b\u9762\u6211\u4eec\u5206\u522b\u8bb2\u89e3\u4e00\u4e0b\u8fd9\u4e09\u79cdViewport<\/p>\n

<\/a>2.1 layout viewport(\u5e03\u5c40\u89c6\u53e3)<\/h2>\n

\u8fd9\u662f\u79fb\u52a8\u8bbe\u5907\u5f15\u5165\u7684\u7b2c\u4e00\u4e2aViewport\u3002\u5f15\u7528\u4e00\u6bb5\u6211\u975e\u5e38\u6b23\u8d4f\u7684\u8bdd\u6765\u8bf4\u660elayout viewport\uff1a<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u9996\u5148\uff0c\u79fb\u52a8\u8bbe\u5907\u4e0a\u7684\u6d4f\u89c8\u5668\u8ba4\u4e3a\u81ea\u5df1\u5fc5\u987b\u80fd\u8ba9\u6240\u6709\u7684\u7f51\u7ad9\u90fd\u6b63\u5e38\u663e\u793a\uff0c\u5373\u4f7f\u662f\u90a3\u4e9b\u4e0d\u662f\u4e3a\u79fb\u52a8\u8bbe\u5907\u8bbe\u8ba1\u7684\u7f51\u7ad9\u3002\u4f46\u5982\u679c\u4ee5\u6d4f\u89c8\u5668\u7684\u53ef\u89c6\u533a\u57df\u4f5c\u4e3a\u9ed8\u8ba4viewport\u7684\u8bdd\uff0c\u56e0\u4e3a\u79fb\u52a8\u8bbe\u5907\u7684\u5c4f\u5e55\u90fd\u4e0d\u662f\u5f88\u5bbd\uff0c\u6240\u4ee5\u90a3\u4e9b\u4e3a\u684c\u9762\u6d4f\u89c8\u5668\u8bbe\u8ba1\u7684\u7f51\u7ad9\u653e\u5230\u79fb\u52a8\u8bbe\u5907\u4e0a\u663e\u793a\u65f6\uff0c\u5fc5\u7136\u4f1a\u56e0\u4e3a\u79fb\u52a8\u8bbe\u5907\u7684viewport\u592a\u7a84\uff0c\u800c\u6324\u4f5c\u4e00\u56e2\uff0c\u751a\u81f3\u5e03\u5c40\u4ec0\u4e48\u7684\u90fd\u4f1a\u4e71\u6389\u3002\u4e5f\u8bb8\u6709\u4eba\u4f1a\u95ee\uff0c\u73b0\u5728\u4e0d\u662f\u6709\u5f88\u591a\u624b\u673a\u5206\u8fa8\u7387\u90fd\u975e\u5e38\u5927\u5417\uff0c\u6bd4\u5982768×1024\uff0c\u6216\u80051080×1920\u8fd9\u6837\uff0c\u90a3\u8fd9\u6837\u7684\u624b\u673a\u7528\u6765\u663e\u793a\u4e3a\u684c\u9762\u6d4f\u89c8\u5668\u8bbe\u8ba1\u7684\u7f51\u7ad9\u662f\u6ca1\u95ee\u9898\u7684\u5427\uff1f\u524d\u9762\u6211\u4eec\u5df2\u7ecf\u8bf4\u4e86\uff0ccss\u4e2d\u76841px\u5e76\u4e0d\u662f\u4ee3\u8868\u5c4f\u5e55\u4e0a\u76841px\uff0c\u4f60\u5206\u8fa8\u7387\u8d8a\u5927\uff0ccss\u4e2d1px\u4ee3\u8868\u7684\u7269\u7406\u50cf\u7d20\u5c31\u4f1a\u8d8a\u591a\uff0cdevicePixelRatio\u7684\u503c\u4e5f\u8d8a\u5927\uff0c\u8fd9\u5f88\u597d\u7406\u89e3\uff0c\u56e0\u4e3a\u4f60\u5206\u8fa8\u7387\u589e\u5927\u4e86\uff0c\u4f46\u5c4f\u5e55\u5c3a\u5bf8\u5e76\u6ca1\u6709\u53d8\u5927\u591a\u5c11\uff0c\u5fc5\u987b\u8ba9css\u4e2d\u76841px\u4ee3\u8868\u66f4\u591a\u7684\u7269\u7406\u50cf\u7d20\uff0c\u624d\u80fd\u8ba91px\u7684\u4e1c\u897f\u5728\u5c4f\u5e55\u4e0a\u7684\u5927\u5c0f\u4e0e\u90a3\u4e9b\u4f4e\u5206\u8fa8\u7387\u7684\u8bbe\u5907\u5dee\u4e0d\u591a\uff0c\u4e0d\u7136\u5c31\u4f1a\u56e0\u4e3a\u592a\u5c0f\u800c\u770b\u4e0d\u6e05\u3002\u6240\u4ee5\u57281080×1920\u8fd9\u6837\u7684\u8bbe\u5907\u4e0a\uff0c\u5728\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u4e5f\u8bb8\u4f60\u53ea\u8981\u628a\u4e00\u4e2adiv\u7684\u5bbd\u5ea6\u8bbe\u4e3a300\u591apx\uff08\u89c6devicePixelRatio\u7684\u503c\u800c\u5b9a\uff09\uff0c\u5c31\u662f\u6ee1\u5c4f\u7684\u5bbd\u5ea6\u4e86\u3002<\/p>\n

\u56de\u5230\u6b63\u9898\u4e0a\u6765\uff0c\u5982\u679c\u628a\u79fb\u52a8\u8bbe\u5907\u4e0a\u6d4f\u89c8\u5668\u7684\u53ef\u89c6\u533a\u57df\u8bbe\u4e3aviewport\u7684\u8bdd\uff0c\u67d0\u4e9b\u7f51\u7ad9\u5c31\u4f1a\u56e0\u4e3aviewport\u592a\u7a84\u800c\u663e\u793a\u9519\u4e71\uff0c\u6240\u4ee5\u8fd9\u4e9b\u6d4f\u89c8\u5668\u5c31\u51b3\u5b9a\u9ed8\u8ba4\u60c5\u51b5\u4e0b\u628aviewport\u8bbe\u4e3a\u4e00\u4e2a\u8f83\u5bbd\u7684\u503c\uff0c\u6bd4\u5982980px\uff0c\u8fd9\u6837\u7684\u8bdd\u5373\u4f7f\u662f\u90a3\u4e9b\u4e3a\u684c\u9762\u8bbe\u8ba1\u7684\u7f51\u7ad9\u4e5f\u80fd\u5728\u79fb\u52a8\u6d4f\u89c8\u5668\u4e0a\u6b63\u5e38\u663e\u793a\u4e86\u3002ppk\u628a\u8fd9\u4e2a\u6d4f\u89c8\u5668\u9ed8\u8ba4\u7684viewport\u53eb\u505a layout viewport\u3002<\/p><\/blockquote>\n

\u4e0b\u56fe\u5217\u51fa\u4e86\u4e00\u4e9b\u8bbe\u5907\u4e0a\u6d4f\u89c8\u5668\u7684\u9ed8\u8ba4layout viewport\u7684\u5bbd\u5ea6\uff1a
\n
\n\u6ce8\uff1a\u8be5\u56fe\u5f15\u7528\u81ea\uff1ahttp:\/\/www.quirksmode.org\/mobile\/metaviewport\/#t10<\/a>
\n\u56fe\u4e2d\u7684\u6570\u503c\u5747\u662f\u5408\u7406\u7684\uff0c\u6ca1\u6709\u5bf9\u9519\u4e4b\u5206\uff0c\u8fd9\u4e2a\u6570\u503c\u662f\u7531\u8bbe\u5907\u5382\u5546\u81ea\u5df1\u51b3\u5b9a\u7684\u3002<\/p>\n

<\/a>2.1.1 \u624b\u673a\u6d4f\u89c8\u5668\u6e32\u67d3\u7f51\u9875\u7684\u8fc7\u7a0b<\/h3>\n

\u5728\u8fd9\u91cc\u6709\u5fc5\u8981\u8bf4\u660e\u4e00\u4e0b\u624b\u673a\u6d4f\u89c8\u5668\u6e32\u67d3\u7f51\u9875\u7684\u8fc7\u7a0b\uff1a<\/p>\n

Step 1: \u6e32\u67d3\u2014\u2014\u2014\u2014\u5c06\u6574\u4e2a\u9875\u9762\u6e32\u67d3\u5728\u4e00\u4e2alayout viewport\u4e2d\uff0c\u4ee5\u4fdd\u8bc1\u9875\u9762\u6392\u7248\u6b63\u786e\u3002
\nStep 2: \u7f29\u653e\u2014\u2014\u2014\u2014\u5c06\u6574\u4e2alayout viewport\u7f29\u653e\u5230visual viewport\u5927\u5c0f\uff0c\u4ee5\u4fdd\u8bc1\u9875\u9762\u5728\u624b\u673a\u5c4f\u5e55\u4e0a\u88ab\u5b8c\u6574\u663e\u793a\u51fa\u6765<\/p>\n

\u4e5f\u6b63\u662f\u56e0\u4e3a\u7f29\u653e\uff0c\u624d\u4f1a\u51fa\u73b0\u624b\u673a\u4e0afont-size\u4e3a40px\u4e0epc\u4e0afont-size12px\u7684\u540c\u7b49\u7269\u7406\u5927\u5c0f\u7684\u60c5\u51b5<\/p>\n

<\/a>2.1.2 \u83b7\u53d6layout viewport\u7684\u5c3a\u5bf8<\/h3>\n

\u901a\u8fc7document.documentElement.clientWidth\u548c-Height\u53ef\u4ee5\u83b7\u53d6layout viewport\u7684\u5c3a\u5bf8
\n\u517c\u5bb9\u6027\uff1a\u8fd9\u79cd\u83b7\u53d6\u65b9\u5f0f\u5728Android \u548cIPhone\u624b\u673a\u4e0a\u5b8c\u5168\u652f\u6301\u3002
\n(\u539f\u6587\u5730\u5740\uff1ahttp:\/\/weizhifeng.net\/viewports2.html<\/a>)<\/p><\/blockquote>\n

<\/a>2.2 visual viewport(\u53ef\u89c6\u89c6\u53e3)<\/h2>\n

\u540c\u6837\u5f15\u7528\u4e00\u6bb5\u6211\u975e\u5e38\u6b23\u8d4f\u7684\u8bdd\u6765\u8bf4\u660evisual viewport\uff1a<\/p>\n

\u56e0\u4e3a\u6d4f\u89c8\u5668\u53ef\u89c6\u533a\u57df(visual viewport)\u7684\u5bbd\u5ea6\u6bd4\u8fd9\u4e2alayout viewport\u7684\u5bbd\u5ea6\u8981\u5c0f(\u89c1\u7b2c\u56db\u90e8\u5206<\u603b\u7ed3>\u7b2c7\u6761)\uff0c\u5e26\u6765\u7684\u540e\u679c\u5c31\u662f\u6d4f\u89c8\u5668\u4f1a\u51fa\u73b0\u6a2a\u5411\u6eda\u52a8\u6761\uff0c\u6240\u4ee5\u6211\u4eec\u8fd8\u9700\u8981\u4e00\u4e2aviewport\u6765\u4ee3\u8868\u6d4f\u89c8\u5668\u53ef\u89c6\u533a\u57df\u7684\u5927\u5c0f\uff0cppk\u628a\u8fd9\u4e2aviewport\u53eb\u505a visual viewport\u3002<\/p><\/blockquote>\n

<\/a>2.2.1 \u83b7\u53d6visual viewport\u7684\u5c3a\u5bf8<\/h3>\n

\u5bf9\u4e8evisual viewport\uff0c\u5b83\u662f\u901a\u8fc7window.innerWidth\/Height\u6765\u8fdb\u884c\u5ea6\u91cf\u7684\u3002\u5f88\u660e\u663e\u5f53\u7528\u6237\u7f29\u5c0f\u6216\u8005\u653e\u5927\u7684\u65f6\u5019\uff0c\u5ea6\u91cf\u7684\u5c3a\u5bf8\u4f1a\u53d1\u751f\u53d8\u5316\u3002
\n\u517c\u5bb9\u6027\uff1aIPhone\u4e0a\u5b8c\u5168\u652f\u6301\uff0c\u5728Android 2, Oprea mini \u548c UC 8\u4e2d\u65e0\u6cd5\u6b63\u786e\u83b7\u53d6\u3002
\n(\u539f\u6587\u5730\u5740\uff1ahttp:\/\/weizhifeng.net\/viewports2.html<\/a>)<\/p><\/blockquote>\n

<\/a>2.3 ideal viewport(\u7406\u60f3\u89c6\u53e3)<\/h2>\n

\u518d\u6b21\u5f15\u7528\u4e00\u6bb5\u6211\u975e\u5e38\u6b23\u8d4f\u7684\u8bdd\u6765\u8bf4\u660eideal viewport\uff1a<\/p>\n

\u53c8\u56e0\u4e3a\u73b0\u5728\u8d8a\u6765\u8d8a\u591a\u7684\u7f51\u7ad9\u90fd\u4f1a\u4e3a\u79fb\u52a8\u8bbe\u5907\u8fdb\u884c\u5355\u72ec\u7684\u8bbe\u8ba1\uff0c\u6240\u4ee5\u5fc5\u987b\u8fd8\u8981\u6709\u4e00\u4e2a\u80fd\u5b8c\u7f8e\u9002\u914d\u79fb\u52a8\u8bbe\u5907\u7684viewport\u3002\u6240\u8c13\u7684\u5b8c\u7f8e\u9002\u914d\u6307\u7684\u662f\uff0c\u9996\u5148\u4e0d\u9700\u8981\u7528\u6237\u7f29\u653e\u548c\u6a2a\u5411\u6eda\u52a8\u6761\u5c31\u80fd\u6b63\u5e38\u7684\u67e5\u770b\u7f51\u7ad9\u7684\u6240\u6709\u5185\u5bb9\uff1b\u7b2c\u4e8c\uff0c\u663e\u793a\u7684\u6587\u5b57\u7684\u5927\u5c0f\u662f\u5408\u9002\uff0c\u6bd4\u5982\u4e00\u6bb514px\u5927\u5c0f\u7684\u6587\u5b57\uff0c\u4e0d\u4f1a\u56e0\u4e3a\u5728\u4e00\u4e2a\u9ad8\u5bc6\u5ea6\u50cf\u7d20\u7684\u5c4f\u5e55\u91cc\u663e\u793a\u5f97\u592a\u5c0f\u800c\u65e0\u6cd5\u770b\u6e05\uff0c\u7406\u60f3\u7684\u60c5\u51b5\u662f\u8fd9\u6bb514px\u7684\u6587\u5b57\u65e0\u8bba\u662f\u5728\u4f55\u79cd\u5bc6\u5ea6\u5c4f\u5e55\uff0c\u4f55\u79cd\u5206\u8fa8\u7387\u4e0b\uff0c\u663e\u793a\u51fa\u6765\u7684\u5927\u5c0f\u90fd\u662f\u5dee\u4e0d\u591a\u7684\u3002\u5f53\u7136\uff0c\u4e0d\u53ea\u662f\u6587\u5b57\uff0c\u5176\u4ed6\u5143\u7d20\u50cf\u56fe\u7247\u4ec0\u4e48\u7684\u4e5f\u662f\u8fd9\u4e2a\u9053\u7406\u3002ppk\u628a\u8fd9\u4e2aviewport\u53eb\u505a ideal viewport\uff0c\u4e5f\u5c31\u662f\u7b2c\u4e09\u4e2aviewport\u2014\u2014\u79fb\u52a8\u8bbe\u5907\u7684\u7406\u60f3viewport\u3002<\/p>\n

ideal viewport\u5e76\u6ca1\u6709\u4e00\u4e2a\u56fa\u5b9a\u7684\u5c3a\u5bf8\uff0c\u4e0d\u540c\u7684\u8bbe\u5907\u62e5\u6709\u6709\u4e0d\u540c\u7684ideal viewport\u3002\u6240\u6709\u7684iphone\u7684ideal viewport\u5bbd\u5ea6\u90fd\u662f320px\uff0c\u65e0\u8bba\u5b83\u7684\u5c4f\u5e55\u5bbd\u5ea6\u662f320\u8fd8\u662f640\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u5728iphone\u4e2d\uff0ccss\u4e2d\u7684320px\u5c31\u4ee3\u8868iphone\u5c4f\u5e55\u7684\u5bbd\u5ea6\u3002<\/p>\n

\u4f46\u662f\u5b89\u5353\u8bbe\u5907\u5c31\u6bd4\u8f83\u590d\u6742\u4e86\uff0c\u6709320px\u7684\uff0c\u6709360px\u7684\uff0c\u6709384px\u7684\u7b49\u7b49\uff0c\u5173\u4e8e\u4e0d\u540c\u7684\u8bbe\u5907ideal viewport\u7684\u5bbd\u5ea6\u90fd\u4e3a\u591a\u5c11\uff0c\u53ef\u4ee5\u5230http:\/\/viewportsizes.com<\/a>\u53bb\u67e5\u770b\u4e00\u4e0b\uff0c\u91cc\u9762\u6536\u96c6\u4e86\u4f17\u591a\u8bbe\u5907\u7684\u7406\u60f3\u5bbd\u5ea6\u3002<\/p>\n

\u518d\u603b\u7ed3\u4e00\u4e0b\uff1appk\u628a\u79fb\u52a8\u8bbe\u5907\u4e0a\u7684viewport\u5206\u4e3alayout viewport \u3001 visual viewport \u548c ideal viewport \u4e09\u7c7b\uff0c\u5176\u4e2d\u7684ideal viewport\u662f\u6700\u9002\u5408\u79fb\u52a8\u8bbe\u5907\u7684viewport\uff0cideal viewport\u7684\u5bbd\u5ea6\u7b49\u4e8e\u79fb\u52a8\u8bbe\u5907\u7684\u5c4f\u5e55\u5bbd\u5ea6(\u5373\u8bbe\u5907\u903b\u8f91\u50cf\u7d20\uff0c\u672c\u6587\u4f5c\u8005\u6ce8)\uff0c\u53ea\u8981\u5728css\u4e2d\u628a\u67d0\u4e00\u5143\u7d20\u7684\u5bbd\u5ea6\u8bbe\u4e3aideal viewport\u7684\u5bbd\u5ea6\uff0c\u90a3\u4e48\u8fd9\u4e2a\u5143\u7d20\u7684\u5bbd\u5ea6\u5c31\u662f\u8bbe\u5907\u5c4f\u5e55\u7684\u5bbd\u5ea6\u4e86\uff0c\u4e5f\u5c31\u662f\u5bbd\u5ea6\u4e3a100%\u7684\u6548\u679c\u3002ideal viewport \u7684\u610f\u4e49\u5728\u4e8e\uff0c\u65e0\u8bba\u5728\u4f55\u79cd\u5206\u8fa8\u7387\u7684\u5c4f\u5e55\u4e0b\uff0c\u90a3\u4e9b\u9488\u5bf9ideal viewport \u800c\u8bbe\u8ba1\u7684\u7f51\u7ad9\uff0c\u4e0d\u9700\u8981\u7528\u6237\u624b\u52a8\u7f29\u653e\uff0c\u4e5f\u4e0d\u9700\u8981\u51fa\u73b0\u6a2a\u5411\u6eda\u52a8\u6761\uff0c\u90fd\u53ef\u4ee5\u5b8c\u7f8e\u7684\u5448\u73b0\u7ed9\u7528\u6237\u3002<\/p><\/blockquote>\n

\u4ece\u4e0a\u8ff0\u63cf\u8ff0\uff0c\u6211\u4eec\u53ef\u4ee5\u5f97\u5230\u4e00\u4e2a\u7ed3\u8bba\uff1a<\/p>\n

ideal viewport\u7684\u5bbd\u5ea6\u7b49\u4e8e\u79fb\u52a8\u8bbe\u5907\u7684\u5c4f\u5e55\u5bbd\u5ea6(\u8fd9\u4e2a\u7406\u60f3\u7684\u5bbd\u5ea6\u662f\u6307\u4ee5CSS\u50cf\u7d20\u5355\u4f4d\u8ba1\u7b97\u7684\u5bbd\u5ea6\uff0c\u5373\u5c4f\u5e55\u7684\u903b\u8f91\u50cf\u7d20\u5bbd\u5ea6)\uff0c\u8ddf\u8bbe\u5907\u7684\u7269\u7406\u5bbd\u5ea6\u6ca1\u6709\u5173\u7cfb\u3002\u5728css\u4e2d\uff0c\u8fd9\u4e2a\u5bbd\u5ea6\u5c31\u76f8\u5f53\u4e8e100%\u7684\u6240\u4ee3\u8868\u7684\u90a3\u4e2a\u5bbd\u5ea6\u3002<\/p>\n

\u5373\u6709\uff1a
\nideal viewport\u7684\u5bbd\u5ea6 = \u5c4f\u5e55\u7684\u903b\u8f91\u50cf\u7d20\u5bbd\u5ea6<\/strong><\/p>\n

\u6700\u540e\uff0c\u6211\u4eec\u901a\u8fc7\u4e00\u6bb5\u5f15\u7528\u518d\u8bf4\u8bf4ideal viewport\u5b58\u5728\u7684\u5fc5\u8981\u6027\uff1a<\/p>\n

\u4e3a\u4ec0\u4e48\u9700\u8981\u6709\u7406\u60f3\u7684viewport\u5462\uff1f\u6bd4\u5982\u4e00\u4e2a\u5206\u8fa8\u7387\u4e3a320×480\u7684\u624b\u673a\u7406\u60f3viewport\u7684\u5bbd\u5ea6\u662f320px\uff0c\u800c\u53e6\u4e00\u4e2a\u5c4f\u5e55\u5c3a\u5bf8\u76f8\u540c\u4f46\u5206\u8fa8\u7387\u4e3a640×960\u7684\u624b\u673a\u7684\u7406\u60f3viewport\u5bbd\u5ea6\u4e5f\u662f\u4e3a320px\uff0c\u90a3\u4e3a\u4ec0\u4e48\u5206\u8fa8\u7387\u5927\u7684\u8fd9\u4e2a\u624b\u673a\u7684\u7406\u60f3\u5bbd\u5ea6\u8981\u8ddf\u5206\u8fa8\u7387\u5c0f\u7684\u90a3\u4e2a\u624b\u673a\u7684\u7406\u60f3\u5bbd\u5ea6\u4e00\u6837\u5462\uff1f\u8fd9\u662f\u56e0\u4e3a\uff0c\u53ea\u6709\u8fd9\u6837\u624d\u80fd\u4fdd\u8bc1\u540c\u6837\u7684\u7f51\u7ad9\u5728\u4e0d\u540c\u5206\u8fa8\u7387\u7684\u8bbe\u5907\u4e0a\u770b\u8d77\u6765\u90fd\u662f\u4e00\u6837\u6216\u5dee\u4e0d\u591a\u7684\u3002\u5b9e\u9645\u4e0a\uff0c\u73b0\u5728\u5e02\u9762\u4e0a\u867d\u7136\u6709\u90a3\u4e48\u591a\u4e0d\u540c\u79cd\u7c7b\u4e0d\u540c\u54c1\u724c\u4e0d\u540c\u5206\u8fa8\u7387\u7684\u624b\u673a\uff0c\u4f46\u5b83\u4eec\u7684\u7406\u60f3viewport\u5bbd\u5ea6\u5f52\u7eb3\u8d77\u6765\u65e0\u975e\u4e5f\u5c31 320\u3001360\u3001384\u3001400\u7b49\u51e0\u79cd\uff0c\u90fd\u662f\u975e\u5e38\u63a5\u8fd1\u7684\uff0c\u7406\u60f3\u5bbd\u5ea6\u7684\u76f8\u8fd1\u4e5f\u5c31\u610f\u5473\u7740\u6211\u4eec\u9488\u5bf9\u67d0\u4e2a\u8bbe\u5907\u7684\u7406\u60f3viewport\u800c\u505a\u51fa\u7684\u7f51\u7ad9\uff0c\u5728\u5176\u4ed6\u8bbe\u5907\u4e0a\u7684\u8868\u73b0\u4e5f\u4e0d\u4f1a\u76f8\u5dee\u975e\u5e38\u591a\u751a\u81f3\u662f\u8868\u73b0\u4e00\u6837\u7684\u3002<\/p><\/blockquote>\n

<\/a>\u4e09 meta\u6807\u7b7e\u63a7\u5236viewport<\/h1>\n

\u79fb\u52a8\u8bbe\u5907\u9ed8\u8ba4\u7684viewport\u662flayout viewport\uff0c\u4f46\u5728\u8fdb\u884c\u79fb\u52a8\u8bbe\u5907\u7f51\u7ad9\u7684\u5f00\u53d1\u65f6\uff0c\u6211\u4eec\u9700\u8981\u7684\u662fideal viewport\u3002\u90a3\u4e48\u600e\u4e48\u624d\u80fd\u5f97\u5230ideal viewport\u5462\uff1f\u8fd9\u5c31\u8be5\u8f6e\u5230meta\u6807\u7b7e\u51fa\u573a\u4e86\u3002<\/p><\/blockquote>\n

\u5728\u5f00\u53d1\u79fb\u52a8\u8bbe\u5907\u7684\u7f51\u7ad9\u65f6\uff0c\u5efa\u8bae\u5728head\u6807\u7b7e\u4e2d\u4f7f\u7528\u5982\u4e0b\u4ee3\u7801\uff1a<\/p>\n

<meta<\/span> name<\/span>=\"viewport\"<\/span> content<\/span>=\"width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0\"<\/span>><\/span><\/code><\/pre>\n