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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <meta charset="UTF-8">
- <meta name="viewport" content="width=device-width, initial-scale=1.0">
- <title>Document</title>
- </head>
- <body>
- <script>
- // typeof [] => object 引用数据类型
- // 1.定义数组
- var arr = [];
- arr[2] = '我的';
- arr[0] = '你的';
- arr[1] = true;
- console.log(arr);
- // arr[xx] 下标：下标从0开始
- // 2.定义数组
- var arr1 = new Array();
- arr1 = ['1',2,false,null,undefined];
- console.log(arr1,'arr1');
- // 3.遍历数组
- var arr3 = [12,23,34,45,56,67,78,89,90];
- // console.log(arr3.length)
- for(var i=0;i<arr3.length;i++){
- console.log(i,'i')
- document.write("此次循环的值是:" + arr3[i]+"<br>");
- }
- </script>
- </body>
- </html>
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