从百度编译器中获取的图片，进行等比例缩放

frm.find("p[id='content']").html(result.data.content);

var imgList =$('#content img');
var wids = 300;
if(imgList.length>0){
imgList.each(function(){
var $this= $(this);
var originalWidth=$this.width();
var originalHeight=$this.height();
$this.width(wids+'px');
$this.height(Math.round(originalHeight / originalWidth * parseInt(wids, 10))+'px');

})
}