lovecoding
/
W250913


			
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<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <ul>
        <li>项目一</li>
        <li>项目二</li>
        <li>项目三</li>
        <li>项目四</li>
        <li>项目五</li>
    </ul>
    <script>
        var aLi = document.getElementsByTagName('li');

        for(var i=0;i<aLi.length;i++){
            aLi[i].index = i; // 自定义属性index 赋值 i
            aLi[i].onmouseover = function(){
                console.log(this.index)
            }
        }

        var obj = {
            a:"1",
            b:"2",
            fun:function(){
                console.log(this.a);
            }
        }
        // 向对象中添加属性
        obj.c = "3";


    </script>
</body>
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