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>

 

posted @ 2017-10-11 10:43  enych  阅读(197)  评论(0)    收藏  举报