老师检查作业

来源：4-3 编程练习

3颗猫饼干

2021-09-15 10:58:31

相关代码：

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
<title>数组</title>
</head>
<body>
<script>

var arr=["有效","无效","有效","无效","无效","有效"];

        for (i =0 ; i < arr.length; i++){
            if (arr[i] == '无效'){
                arr.splice(i,1);
                i--
            }
        }
        console.log(arr);

</script>
</body>
</html>