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  • js 习题

     1 <!DOCTYPE html>
     2 <html>
     3 <head>
     4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
     5     <title></title>
     6     <meta charset="utf-8" />
     7 </head>
     8 <body>
     9     <script>
    10         var a = prompt("请输入名字", "");
    11         document.write(a);
    12     </script>
    13 
    14     <script>//输出个位 十位 百位  千位 
    15         var a = 1234;
    16         var qianwei = a / 1000;
    17         var baiwei = a % 1000 / 100;
    18         var shiwei = a % 1000 % 100 / 10;
    19         var gewei = a % 1000 % 100 % 10;
    20         document.write(a + "<br/>");
    21         document.write(parseInt(qianwei)+"<br/>");
    22         document.write(parseInt(baiwei) + "<br/>");
    23         document.write(parseInt(shiwei) + "<br/>");
    24         document.write(gewei + "<br/>");
    25     </script>
    26 
    27     <script> //bim指数
    28         var tz = 110;
    29         var sg = 170;
    30         var bmi = tz / (sg * sg);
    31         if (bmi < 18.5) {
    32             alert("偏瘦");
    33         }else if(bmi<=23.9){
    34             alert("正常");
    35         } else if (bmi < 27.9) {
    36             alert("偏胖");
    37         }
    38     </script>
    39     <script>//韩信点兵
    40         for (i = 100; i <= 200;i++){
    41             if (i % 3 == 1) {
    42                 if(i%5==2){
    43                     if(i%7==5){
    44                         document.write("韩信点兵 "+i+"<br/>");
    45                     }
    46                 }
    47             }
    48         }
    49     </script>
    50     <script> //水仙花
    51         var baiwei, shiwei, gewei;
    52         for (i = 100; i < 1000;i++){
    53             //huoqu
    54             baiwei = parseInt(i / 100);
    55             shiwei = parseInt(i % 100 / 10);
    56             gewei = parseInt(i % 100 % 10);
    57             if (Math.pow(baiwei, 3) + Math.pow(shiwei,3) + Math.pow(gewei ,3) == i) {
    58                 document.write("水仙花 "+i+"<br/>");
    59             }
    60         }
    61     </script>
    62     <script>        //鸡翁百鸡
    63         var z;
    64         for (x = 1; x < 20;x++){
    65             for (y = 1; y < 25;y++){
    66                 z = 100 - x - y;
    67                 if(z%3==0&&x+y+z==100&&5*x+3*y+z/3==100){
    68                     document.write("公鸡:"+x+"<br/>"+"母鸡:"+y+"<br/>"+"小鸡"+z+"<br/>");
    69                 }
    70             }
    71         }
    72     </script>
    73     <script> //高斯求和
    74         var a = new Array(100);
    75         for (i = 0; i < a.length;i++){
    76             a[i] = i + 1;
    77         }
    78         var sum=0;
    79         for (i = 0; i < a.length / 2; i++){
    80             sum += a[i] + a[a.length - (i + 1)]
    81         }
    82         document.write(sum);
    83     </script>
    84 
    85 </body>
    86 </html>
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  • 原文地址:https://www.cnblogs.com/enych/p/7649385.html
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