JS 常用函数及分支与循环

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<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 sum = 60;
    if(sum < 0 && sum > 100){
        console.log("成绩不能小于0或大于100")
    }else if(sum >= 60 && sum <= 79){
        console.log("良好");
    }else if(sum >= 80 && sum <= 89){
        console.log("中等");
    }else if(sum >= 90 && sum <= 100){
        console.log("优秀");
    }else if(sum < 60){
        console.log("不及格");
    }
    let count = 1
    while(count <= 10){
        console.log("循环");
        count ++;
    }
    let arr = ['a','b','c','d','e','f','g'];
    for(let i = 0;i < arr.length; i ++){
        console.log(arr[i]);
    }
    console.log("数组长度："+arr.length);                          //返回数组长度
    console.log("查找数组中字符首次出现的位置："+arr.indexOf('g'));  //查找数组中 g 首次出现的位置
    console.log("提取部分字符含头不含尾："+arr.slice(1,4));          //提取部分字符(截取结果，包含起始位置，不包含终止位置)
    console.log("提取部分字符包含头尾："+'asdfqwer'.substr(1,4));    //提取部分字符(截取结果，包含起始位置与终止位置)
    console.log("替换字符："+'asdfqwer'.replace('qw','替换'));      //替换字符
    console.log("大小写转换："+'asdfqwer'.toUpperCase());           //转换为大写  (toLowerCase() 转换为小写; trim()去除空格，等等常用方法可查询js API)
    </script>
</body>
</html>

Correcting teacher：

PHPz

Correction status：qualified

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JS 常用函数及分支与循环