test.html
<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
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
jquery width,innerWidth,outerWidth 区别
原文：http://antlove.blog.51cto.com/10057557/1924489