(function (doc, win) { // orientationchange:用户水平或者垂直翻转设备（即方向发生变化）时触发的事件;(屏幕大小发生变化) var docEl = doc.documentElement, resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize', recalc = function () { var clientWidth = docEl.clientWidth;//获取当前可视的宽度 if (!clientWidth) return;//不存在返回 if(clientWidth>=640){//大于640时字体设置 docEl.style.fontSize = '100px'; }else{//小于640时 可视宽度/640*100 docEl.style.fontSize = 100 * (clientWidth / 640) + 'px'; } }; if (!doc.addEventListener) return; win.addEventListener(resizeEvt, recalc, false); doc.addEventListener('DOMContentLoaded', recalc, false);//是firefox下特有的Event, 当所有DOM解析完以后会触发这个事件。 })(document, window);
1 <!DOCTYPE html> 2 <html lang="en"> 3 <head> 4 <meta charset="UTF-8"> 5 <title>Title</title> 6 <meta name="viewport" content="width=device-width,initial-scale=1.0,maximum-scale=1.0,user-scalable=no"> 7 <script> 8 9 </script> 10 <style> 11 *{margin: 0;padding: 0;} 12 #title{width: 100%;height: 2rem;background: deepskyblue;} 13 #imgBox{width: 100%;height: 100%;} 14 #imgI{display: block;width: 100%;height: auto;margin: 0 auto;} 15 #imgI img{width: 100%;height: 100%;} 16 17 #imgI1{display: block;width: 6.4rem;height: 3.3rem;margin: 0 auto;} 18 #imgI1 img{width: 100%;height: 100%;} 19 </style> 20 </head> 21 <body> 22 <div id="title"></div> 23 <div id="imgBox"> 24 <i id="imgI"> 25 <img src="/activity_mobile/img/aDG_banner.jpg"> 26 </i> 27 <i id="imgI1"> 28 <img src="/activity_mobile/img/aDG_banner.jpg"> 29 </i> 30 </div> 31 </body> 32 </html>