取得元素
dataset属性
DOMStringMap Object
<!doctype html>
<html>
<head>
<title></title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1.0,
minimum-scale=1.0,maximum-scale=1.0,user-scalable=no">
</head>
<body>
<div id="a" data-title="asd">asd</div>
</body>
<script>
var a=document.getElementById("a");
console.log(a.dataset.title);
a.dataset.title="qqq";
console.log(a.dataset.title);
delete a.dataset.title;
a.dataset.camelName="qqq";
console.log(a.dataset)
</script>
</html>
包含驼峰变量转换（类似angularjs中的derective名称转换）
原文：http://www.cnblogs.com/carlyin/p/5872484.html