2024.5.6 

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="con">
    <h3 id="title" onclick="change()">标题</h3>
</div>
    <script>

        var arr = new Array();
        var arr1 = new Array(5);//只写了一个参数，而且是整数，认为是长度
        arr1[0] = 1;//长度没什么用，越界也可以
        arr1[6] = 1;
        alert(arr1);
        var arr2 = new Array("4.5");//写了多个或不是整数，认为是元素
        alert(arr2);
        
    </script>
</body>
</html>
posted @ 2024-05-06 23:00  Verneyyx  阅读(9)  评论(0)    收藏  举报