字符串控制

<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 cpc ="中国共产党万岁";
        console.log(cpc);
        cpc="中国共产党万岁！".concat("战无不胜的毛泽东思想万岁！","中华人民共和国万岁！");
        console.log(china);
        str=cpc.slice(0,5);
        console.log(str);
        str=cpc.substr(5,2);
        console.log(str);
        str=cpc.substr(-10);
        console.log(str);
        let arr=['马克思列宁主义','毛泽东思想','邓小平理论','三个代表重要思想','科学发展观','习近平新时代中国特色社会主义']
        console.dir(arr);
  </script>
</body>
</html>

建立数组

<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=['马克思列宁主义','毛泽东思想','邓小平理论','三个代表重要思想','科学发展观','习近平新时代中国特色社会主义']
        console.dir(arr);
  </script>
</body>
</html>

流程控制判断成绩

    <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 cj=100;
            if (cj >= 0 && cj<60){
                console.log("您的成绩为"+cj+"分。"+"成绩不及格!")}
            else if (cj>=60 && cj<80){
                console.log("您的成绩为"+cj+"分。"+"成绩良好!")
            } else if(cj>=80 && cj<=100){
                console.log("您的成绩为"+cj+"分。"+"成绩优异!")
            } else {
                console.log("您的成绩为"+cj+"分。"+"成绩不能大于100分且不能为负数")
            }
        </script>
    </body>
    </html>

循环

1.while循环

<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=['马克思列宁主义','毛泽东思想','邓小平理论','三个代表重要思想','科学发展观','习近平新时代中国特色社会主义']
        let i=0;
        while (i<=arr.length){
            console.log(arr[i]);
            i++
        }
    </script>
</body>
</html>

2.for循环

<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=['马克思列宁主义','毛泽东思想','邓小平理论','三个代表重要思想','科学发展观','习近平新时代中国特色社会主义']
        let i=0;
        while (i<arr.length){
            console.log(arr[i]);
            i++
        }
        for(i=0;i<arr.length;i++){
            alert(arr[i]);
        }
    </script>

Correcting teacher：

PHPz

Correction status：qualified

Teacher's comments：

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字符串控制

建立数组

流程控制 判断成绩

循环

流程控制判断成绩