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最新推荐文章于 2025-12-15 15:23:28 发布

原创最新推荐文章于 2025-12-15 15:23:28 发布 · 190 阅读

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#javascript #前端 #开发语言

1 .判断平润年

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        let year =+prompt('请输入年份')
        if(year%400==0||(year%4==0&&year%100!= 0)){
            alert("是闰年")
        }else alert('不是闰年')

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

2.输入数字运算符打印结果

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        let a =+prompt("输入第一个数")
        let b =+prompt("输入第二个输")
        let c =+prompt("输入运算符")
        switch(c){
            case '+':alert(a+b); break;
            case '-':alert(a-b); break;
            case '*':alert(a*b); break;
            case '/':alert(a/b); break;
        }
    </script>
</body>
</html>

3.九九乘法表

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        let i,j
        for(i = 1;i<=9;i++){
            for(j = 1;j<=9;j++){
                let a = i*j
                console.log(a)
            }
        }
    </script>
</body>
</html>