10、数组

2024-10-04 / 0 评论 / 3 阅读 / 正在检测是否收录...

10/04

<!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>
    <script>
        // let arr = [10,20,30,40]
        //  1、声明数组
        let arr = ["小蔡","小徐","小坤"]
        // 2。使用数组  数组名[索引号] 从0
        // console.log(arr)
        consloe.log(arr[0])//小蔡   
        console.log(arr[2])
        // 数组长度 = 索引号+1  
        console.log(arr.length);//3
    </script>
</body>
</html>

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