lovecoding
/
Web1020


			
				
					
						
						
							1234567891011121314151617181920212223242526272829303132333435
							<!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>
        var arr = [];
        // 数组通过下标去添加内容
        // 下标(index)从0开始
        // 数组的最大下标就是length-1
        // 数组长度 length
        arr[0] = 12;
        arr[1] = 23;
        console.log(arr);
        console.log(arr.length);
        // 数组可由多数据类型组成
        var arr1 = [1,2,'eee',true,undefined,null];
        console.log(arr1);
        // 读取数组中的值 arr[index]
        console.log(arr1[3])
        var arr2 = new Array('12','22',false);
        arr2[3] = true;
        console.log(arr2);
        // 遍历数组
        for(var i=0;i < arr1.length;i++) {
            // document.write(arr1[i])
            console.log(arr1[i]);
        }
        console.log(typeof arr1);
    </script>
</body>
</html>