H5自定义属性
<body>
<div getTime = ‘20’ data-index = ‘2’ data-list-name = ‘nav’></div>
<script>
var div = document.querySelector(‘div’);
console.log(div.getAttribute(‘data-list-name’));
//h5新增的获取自定义属性的集合，它只能获取data开头的属性
console.log(div.dataset.index);
console.log(div.dataset.listName);
console.log(div.dataset[‘listName’]);
</script>
</body>
