移动端用canvas代替img渲染图片，可以提高性能
var oImg = new Image(); oImg.src = url; oImg.onload = function(){ var cvs = $(‘#cvsIndex‘)[0].getContext(‘2d‘); cvs.width = this.width; cvs.width = this.height; cvs.drawImage(this,0,0); }
原文：http://www.cnblogs.com/mengff/p/5184047.html