js获取计算的样式(非行间样式)

 1 function getStyle(obj, attr){
 2     if(obj.currentStyle){ 
 3         style = obj.currentStyle[attr]; //兼容IE8以下
 4     }else{
 5         style = getComputedStyle(obj,false)[attr];
 6     };
 7     return style;
 8 }
 9 
10 var ele = document.querySelector(‘body‘);
11 getStyle(ele,‘width‘)