js数据类型、分支、循环 - 大前端

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JS代码

<!DOCTYPE html>
<html lang="zh-CN">
<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>js数据类型、分支、循环</title>
</head>
<body>
    <script>
        // 数据类型
        let a='OK';
        console.log(typeof a);
        console.log('--------------------------');
        let b=100;
        console.log(typeof b);
        console.log('--------------------------');
        let c=['姓名','年龄','学历'];
        console.log(typeof c);
        console.log('--------------------------');
        let d;
        console.log(d);
         // 分支
         let age = 60;
        if(age >=60){
            console.log('老年人');
        } 
        console.log('-------------------------');
        let ages = 35;
        if(ages >=50){
            console.log('中年人');
        }else{
            console.log('青年人');
        }
        console.log('-------------------------');
        let fs=75;
        if(fs >=90 && fs<120){
            console.log('你的分数为：A+');
        }
        else if(fs >70 && fs<80){
            console.log('你的分数为：A');
        }
        else if(fs >60 && fs<70){
            console.log('你的分数为：B+');
        }else{
            console.log('你的分数为：B');
        }
        const colors =['red','green','blue'];
        console.log(colors);
        console.log('-------------------------------------------');
        // for循环方式
        for(let i=0; i<colors.length; i++){
            console.log(colors[i]);
        }
        console.log('-------------------------------------------');
        // for-in循环方式
        for(let item in colors){
            console.log(item+':'+colors[item]);
        }
        console.log('-------------------------------------------');
        // for-of 循环方式
        for(let item of colors.values()){
            console.log('颜色:'+ item);
        }
        console.log('-------------------------------------------');
        for(let item of colors.keys()){
            console.log('键值：'+ item);
        }
        console.log('-------------------------------------------');
        for(let item of colors.entries()){
            console.log('键值+颜色：' + item);
        }
    </script>
</body>
</html>

Correcting teacher：

PHPz

Correction status：qualified

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JS代码