屏幕适配是有多种方式的。

!function(){

var vp;

var sw = window.screen.width;

if (/android (\d+\.\d+)/i.test(navigator.userAgent)) {

var v = parseFloat(RegExp.$1);

var s = 0.5;

var c = v < 4.2 ? Math.ceil(window.devicePixelRatio) : window.devicePixelRatio;

var dpi;

if (c) {

dpi = 640 / sw * c * 160;

} else {

dpi = sw <= 640 ? sw / 640 * 320 : 640 / sw * 320;

}

vp = '<meta name="viewport" content="width=640,initial-scale=' + s + ' ,minimum-scale=' + s + ',maximum-scale=' + s + ',user-scalable=no,target-densitydpi=' + dpi + '">';

} else {

var s = sw / 640;

vp = '<meta name="viewport" content="width=640,initial-scale=' + s + ' ,minimum-scale=' + s + ',maximum-scale=' + s + ',user-scalable=no">';

}

document.write(vp);

我还没看老师的源码。但是像这种就是直接根据屏幕大小来缩放页面的。就可以直接用px来写页面