23元素创建之点击按钮创建列表

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title></title>
        <style>
            div {
          width: 300px;
          height: 400px;
          background-color: green;
        }
      </style>
    </head>
    <body>
        <input type="button" value="创建列表" id="btn" />
        <div id="dv"></div>
        <script src="common.js"></script>
        <script type="text/javascript">
            var names = ["杨过", "郭靖", "张无忌", "张三丰", "乔峰", "段飞", "丁棚"];
            my$("btn").onclick = function() {
                var str = "<ul style='list-style-type:none;cursor:pointer' >";
                for (var i = 0; i < names.length; i++) {
                    str += "<li>" + names[i] + "</li>";
                }
                str += "</ul>";
                my$("dv").innerHTML = str;
                //代码执行到这里,li已经有了
                
                //获取所有的li
                var list = my$("dv").getElementsByTagName("li");
                for (var j = 0; j < list.length; j++) {
                    //鼠标进入事件
                    list[j].onmouseover = function() {
                        this.style.backgroundColor = "red";
                    };
                    //鼠标离开事件
                    list[j].onmouseout = function() {
                        this.style.backgroundColor = "";
                    };
                }
            };
        </script>
    </body>
</html>
原文地址：https://www.cnblogs.com/zhangDY/p/11494801.html