JS片段大总结

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>
　　