for循環(huán)

奇數(shù)之和

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>奇數(shù)之和</title>
    <script type="text/javascript">
        for(var i=1,sum=0; i<=100; i++){
            if(i % 2 != 0){
                sum += i;
            }
        }

        console.log("奇數(shù)之和為:" + sum);
    </script>
</head>
<body>
    
</body>
</html>

7的倍數(shù)

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>7的倍數(shù)</title>
    <script type="text/javascript">
        var sum = 0;
        var count = 0;
        for(var i=1; i<=100; i++){
            if (i % 7 == 0) {
                sum += i;
                count++;
            }
        }

        console.log("總和為:" + sum);
        console.log("個(gè)數(shù)為:" + count);
    </script>
</head>
<body>
    
</body>
</html>

水仙花數(shù)

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>水仙花數(shù)</title>
    <script type="text/javascript">
        for(var i=100; i<1000; i++){
            var b = parseInt(i/100);
            var s = parseInt((i-b*100)/10);
            var g = i % 10;
            if(b**3 + s**3 + g**3 == i){
                console.log(i);
            }
        }
    </script>
</head>
<body>
    
</body>
</html>

判斷是否為質(zhì)數(shù)

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>判斷是否為質(zhì)數(shù)</title>
    <script type="text/javascript">
        var num = prompt("請(qǐng)輸入一個(gè)大于1的整數(shù):");
        if(num <= 1 || isNaN(num)){
            alert('該值不合法!');
        }else{
            var flag = true;
            for(var i=2; i<num; i++){
                if(num % i ==0){
                    flag = false;
                }
            }
            if(flag){
                alert(num + "是質(zhì)數(shù)!");
            }else{
                alert(num + "不是質(zhì)數(shù)!");
            }
        }
    </script>
</head>
<body>
    
</body>
</html>

99乘法表

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>99乘法表</title>
    <style type="text/css">
        body{
            width: 1000px;
        }
        span{
            display: inline-block;
            width: 70px;
        }
    </style>
    <script type="text/javascript">
        for(var i=1; i<=9; i++){
            for(var j=1; j<=i; j++){
                document.write("<span>"+j+"*"+i+"="+i*j+"</span>");
            }
            document.write('<br>');
        }
    </script>
</head>
<body>
    
</body>
</html>

1~100之間的質(zhì)數(shù)

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>1-100之間所有的質(zhì)數(shù)</title>
    <script type="text/javascript">
        console.time("test");
        for(var i=2; i<=100; i++){
            var flag = true;
            for(var j=2; j<=Math.sqrt(i); j++){
                if(i % j ==0){
                    flag = false;
                    break;
                }
            }
            if(flag){
                console.log(i);
            }
        }
        console.timeEnd("test");
    </script>
</head>
<body>
    
</body>
</html>
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