html中的标签都可以加一个id的属性。
<body>
<div id="tree" data-leaves="47" data-plant-height="2.4m"></div>
<script>
var tree = document.getElementById("tree");
//getAttribute()取值属性
console.log(tree.getAttribute("data-leaves"));
console.log(tree.getAttribute("data-plant-height"));
//setAttribute()赋值属性
tree.setAttribute("data-leaves","48");
//data-前缀属性可以在JS中通过dataset取值，更加方便
console.log(tree.dataset.leaves);
console.log(tree.dataset.plantHeight);
//赋值
tree.dataset.plantHeight = "3m";
tree.dataset.leaves--;
//新增data属性
tree.dataset.age = "100";
//删除，设置成null，或者delete
tree.dataset.leaves = null;
delete tree.dataset.age;
//jQuery的data方法
var tree = $('#tree');
console.log(tree.data("plant-height"));
</script>
</body>
绑定点击事件
<a id="sam" class="gray_btn" href="javascript:void(0)" onclick="rClick({$vo.lsn_begin_time},{$vo.id})" data-time= "{$vo.lsn_begin_time}" data-id ="{$vo.id}">修改教材</a>
<script>
function rClick(begin_time,id){
console.log(begin_time);
console.log(id);
// var tree = document.getElementById("sam");
// //上课时间
// var begin_time = tree.getAttribute("data-time");
// //课时id
// var id = tree.getAttribute("data-id");
// var myDate = new Date();//获取系统当前时间
//当前时间 js获取时间 得到是毫秒
//var time_now = (new Date().getTime());
//var timestamp =(new Date()).valueOf();
begin_time2 = begin_time * 1000;
// console.log(begin_time)
// console.log(time_now)
// console.log(begin_time-time_now);
// console.log(id);
if(begin_time2-time_now < 7200000){
alert('开课前2小时内无法修改章节,下次请提前操作！');
}else{
window.location.href="__URL__/updateLessonMaterial/id/"+id;
} }
</script>