前端

1.水仙數(shù)

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

2.質(zhì)數(shù)

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>質(zhì)數(shù)</title>
</head>
<body>
    <script type="text/javascript">
    var num =Number(prompt("請輸入一個(gè)正整數(shù),判斷此數(shù)是不是素?cái)?shù)"));//要判斷的數(shù)
    var flag = true;//假設(shè)變量  值為true 是素?cái)?shù) 
    for( var i = 2 ; i < num ; i++ ){
        if( num % i == 0 ){//滿足這個(gè)條件  說明有因子了  不是素?cái)?shù)
            flag = false;//不是素?cái)?shù)
            break;
        }
    }
    //如果假設(shè)成立  
    if( flag && num != 1 ){ //1不是素?cái)?shù)
        document.write( num + "是素?cái)?shù)" );
    }else{
        document.write( num + "不是素?cái)?shù)" );
    }

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

3.乘法口訣表

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>乘法口訣表</title>
</head>
<body onload="step()">
<script type="text/javascript" >
    function step(){
        for(i=1;i<=9;i++){
            for(j=1;j<=i;j++){
                document.write(i+"x"+j+"="+i*j +"&nbsp&nbsp&nbsp");
                    }document.write("<br/>");
        }
    }
</script>

</body>

</html>

4.質(zhì)數(shù)求和

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>1-100質(zhì)數(shù)求和</title>
</head>
<body>

    <div id="wrap"></div>
    <script type="text/javascript">
        

        var wrap = document.getElementById("wrap");
        var str = "";
        for (var i = 2; i <= 100; i++) {
            var count = 0;
            for (var j = 1; j <= i; j++) {
                if( i%j ==0 ){
                    count++;
                }
            }
            if (count == 2) {
                str += "<span>" + i + "</span><br>";
            }
            count = 0;
        }
        wrap.innerHTML = str;

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

5.奇數(shù)求和

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>1-100之間的奇數(shù)和</title>
</head>
<body>
    
<script>
    var sum = 0;
    for(var i = 1; i <= 100; i++){
     if(i % 2!= 0){
        sum += i;
     }   
    }
    document.write(sum+"<br>");
   
   
   sum = 0;
   for(var i=1;i<100;i+=2){
    sum+=i;
   }
   document.write(sum);
 
</script>
</body>
</html>

6. 7的倍數(shù)求和

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
</head>
<body>
    <script type="text/javascript">
        function sum(){
         var sum = 0;
             for(var i = 1; i < 100; i++){
                if(i % 7 == 0){sum+=i;}
             }
         return sum;
         }
         document.write('總和：'+sum())
    </script>

    <script type="text/javascript">
        function num(){
         var num = 0;
             for(var i = 1; i < 100; i++){
                if(i % 7 == 0){num++;}
             }
         return num;
         }
         document.write('計(jì)數(shù)：'+num())
    </script>
</body>
</html>
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