test.html

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< html >
< head >
     < meta  charset = "utf-8" >
     < meta  http-equiv = "X-UA-Compatible"  content = "IE=edge,chrome=1" >
     
     < style >
         #box1{width:200px;height:200px;background-color:pink;padding:20px;margin:30px;box-sizing:border-box;border:1px solid red;}
         #box2{width:200px;height:200px;background-color:#ececec;padding:20px;margin:30px;box-sizing:content-box;border:1px solid red;}
     </ style >
     < script  src = "jquery-1.11.3.min.js" ></ script >
</ head >
< body >
 
     < div  id = "box1" ></ div >
     
     < div  id = "box2" ></ div >
 
     < script >
         console.log("box1 info ... ");
         console.log("inner width:"+$("#box1").innerWidth());
         console.log("width:"+$("#box1").width());
         console.log("outer inner width:"+$("#box1").outerWidth());
         console.log("outer inner true width:"+$("#box1").outerWidth(true));
         console.log("css width:"+$("#box1").css("height"));
         
         console.log("box2 info ... ");
         console.log("inner width:"+$("#box2").innerWidth());
         console.log("width:"+$("#box2").width());
         console.log("outer inner width:"+$("#box2").outerWidth());
         console.log("outer inner true width:"+$("#box2").outerWidth(true));
         console.log("css width:"+$("#box2").css("height"));
     </ script >
</ body >
</ html >

结果

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box1 info ... 
inner width:198
width:158
outer inner width:200
outer inner  true  width:260
css width:200px
box2 info ... 
inner width:240
width:200
outer inner width:242
outer inner  true  width:302
css width:200px