js生成标签

// 将标签添加到i1里面

var tag = document.createElement('input');

tag.setAttribute('type', 'text');

tag.style.fontSize = '16px'

tag.style.color = 'red';

点击已删除按钮会出现已删除的字样，5秒后消失

<input type="button" value="删除" onclick="DeleteEle();" />

<script>

    function  DeleteEle(){

        document.getElementById('status').innerText = "已删除";

        setTimeout(function () {

                document.getElementById('status').innerText = "";

        }, 5000);

    }

this用法

<script>

    var myTrs = document.getElementsByTagName("tr");

    var len = myTrs.length;

    for(var i=0;i<len;i++){

        // i=0,i=1,i=2

        myTrs[i].onmouseover = function(){

             this.style.backgroundColor = "red";

        };

<script>

this指代的是“调用函数的那个对象”

点击查看：this详解