第二十一天到二十三天学习笔记

先是做了下一个小的导航栏

 1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 2 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-cn">
 3 <head>
 4     <meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
 5     <title>网页标题</title>
 6     <style type="text/css">
 7         *{margin:0;padding:0;}
 8         ._main{
 9             width:100%;
10         }
11         ._nav{
12             width:500px;
13             margin:0px auto;
14             border-bottom:2px solid red;
15         }
16         h4{
17             padding-left:20px;
18             width:80px;
19             /*display:block;*/
20         }
21         ._nav ul li{
22             float:left;
23             width:100px;
24             list-style-type:none;
25             text-align:center;
26             height:30px;
27             line-height:30px;
28         }
29         ._clear{
30             clear:both;
31         }
32         a{
33             text-decoration: none;
34             display:block;
35         }
36 
37         a:link,a:visited{
38             color:#000;
39         }
40         a:hover{
41             color:#fff;
42             background-color:red;
43         }
44         ._center{
45             width:500px;
46             margin:0px auto;
47             border-top:2xp solid red;
48         }
49         ._center ul{
50             background:url(Images/bg.gif)no-repeat left 7px;/*简写属性*/
51         }
52         ._center ul li{
53             height:26px;
54             line-height:26px;
55             list-style-type:none;
56             padding-left:22px;
57             font-size:14px;
58         }
59     </style>
60 </head>
61 <body>
62     <div class = "_main">
63         <div class = "_nav">
64             <ul>
65                 <li><h4>新闻排行</h4></li>
66                 <li><a href = "#">国内</a></li>
67                 <li><a href = "#">国际</a></li>
68                 <li><a href = "#">社会</a></li>
69                 <li><a href = "#">网评</a></li>
70             </ul>
71             <div class = "_clear"></div>
72             </div>
73             <div class = "_center">
74                 <ul>
75                     <li><a href = "#">这是一个链接...</li>
76                     <li><a href = "#">这是一个链接...</li>
77                     <li><a href = "#">这是一个链接...</li>
78                     <li><a href = "#">这是一个链接...</li>
79                     <li><a href = "#">这是一个链接...</li>
80                     <li><a href = "#">这是一个链接...</li>
81                     <li><a href = "#">这是一个链接...</li>
82                     <li><a href = "#">这是一个链接...</li>
83                     <li><a href = "#">这是一个链接...</li>
84                 </ul>
85             </div>
86             <div class = "_clear"></div>
87         </div>
88     </div>
89 </body>
90 </html>

以下是效果图:

=================================

接下来做了三目运算符求最大数:

1 var index_1 =500,index_2 = 20000,index_3 = 10; 2 document.write((index_1>index_2)?(index_1>index_3?index_1 : index_3) : (index_3>index_2?index_3: index_2));

以下是效果图:

==================================

关于第九天的作业,代码如下:

  1 <!DOCTYPE html>
  2 <html lang="en">
  3 <head>
  4     <meta charset="UTF-8">
  5     <title>第九天作业</title>
  6 </head>
  7 <body>
  8     <script type="text/javascript">
  9         //第一题
 10         //prompt("text","value");弹窗输入;
 11         //parseInt(value);对数进行取整;
 12         /*
 13         var res = window.prompt('输入成绩');
 14         res = parseInt(res);
 15         document.write(res);
 16         */
 17         //===============================================
 18         /*
 19         if (res>=90) {document.write("优秀!");}
 20         else if (res>=80) {document.write("良好!");}
 21         else if (res>=70) {document.write("中等!");}
 22         else if (res>=60) {document.write("及格!");}
 23         else {document.write("不及格!");}
 24         
 25         switch (parseInt((res/10))) {
 26             case 9:
 27                 document.write("优秀");
 28                 break;
 29             case 8:
 30                 document.write("良好");
 31                 break;
 32             case 7:
 33                 document.write("中等");
 34                 break;
 35             case 6:
 36                 document.write("及格");
 37                 break;
 38             default:
 39                 document.write("不及格")
 40                 break;
 41         }
 42         */
 43 
 44         //===============================================
 45         //第二题
 46         
 47         //行
 48         /*var row = 1;
 49         //列
 50         var low = 1;
 51         var ser = ("<table width='600' align='center' border='1'>");
 52             while(row <= 9)
 53             {
 54                 ser += ("<tr>");
 55                 while(low<=row)
 56                 {
 57                     ser += ("<td>"+row+"&times"+low+"="+ row*low +"</td>");
 58                     low++;
 59                 }
 60                 ser += ("</tr>");
 61                 low = 1;
 62                 row++;
 63             }
 64             ser += ("</table>")
 65         document.write(ser);*/
 66         
 67         //===============================================
 68         //第三题
 69         
 70         //===============================================
 71 
 72         //第四题
 73         /*
 74         for (var i = 1;i<=100;i++)
 75         {
 76             if (i%3==0&&i%5==0) 
 77             {
 78                 document.write("三五"+"</br>");
 79             }
 80             else if (i%3==0) 
 81             {
 82                 document.write("三"+"</br>");
 83             }
 84             else if (i%5==0) 
 85             {
 86                 document.write("五"+"</br>");
 87             }
 88             else{
 89                 document.write(i+"</br>");
 90             }
 91         }*/
 92         //===============================================
 93         //第五题
 94         /*
 95         for (var i = 1;i<=100;i++) {
 96             if (i % 3 == 0) 
 97             {
 98                 document.write(i+"<br/>");
 99             }
100         }
101         */
102         //===============================================
103         //第六题
104         /*
105         var ser = window.prompt();
106         for (var i = 1;i<=100;i++) {
107             if (ser % i == 0) 
108             {
109                 document.write(i+"</br>");
110             }
111         }
112         */
113         //===============================================
114         //第七题
115         /*
116         var num = 1;
117         var ser = window.prompt();
118         for (var i = 1;i<=100;i++) {
119             if (ser % i == 0) 
120             {
121                 num+=1;
122             }
123         }
124         document.write(num-1);
125         */
126         //===============================================
127         //第八题
128         /*
129         var ser = window.prompt();
130         if(ser % ser == 0 && ser % 1 == 0)
131         {
132             document.write("这个数是质数!");
133         }
134         else{
135             document.write("这个数不是质数!");
136         }
137         */
138         //===============================================
139         //第九题
140         /*
141         for (var i = 1; i <= 100; i++) {
142             if (i % i == 0 && i % 1 == 0) {
143                 document.write(i+"</br>");
144             }
145         }
146         */
147         //===============================================
148         //第十题
149         /*
150         var index = 9;
151         for (var i = 19; i >= 1; i--) {
152             for (var j = 1 ; j <= index&& j>0 ; j++) {
153                 document.write(index);
154             }
155             
156             document.write("</br>");
157         }
158         */
159         //===============================================
160         //第十一题
161         /*
162         var ply = 0.01;
163         var max_ply = 0;
164         for (var i = 0; i < 31; i++) {
165             max_ply+=(ply*2);
166         }
167         console.log(max_ply);*/
168     </script>
169 </body>
170 </html>

==========================================

 1 <!DOCTYPE html>
 2 <html>
 3     <head>
 4         <title>第一题</title>
 5         <meta charset = "UTF-8">
 6         <style type = "text/css">
 7         </style>
 8         <script type = "text/javascript">
 9         //指定用户输入;
10         var sorc = prompt("输入你的分数");
11         if(sore == "")
12         {
13             document.write("请在输入后点击确定");
14         }
15         if(sore == null)
16         {
17             document.write("你点击了取消按钮");
18         }
19         //将用户输入强制转换成Number类型
20         var point = number(sore);
21         //判断是否属于Number类型
22         if(point >= 0 && point <= 100)
23         {
24             if(point>=90)
25             {
26                 document.write("优秀");
27             }
28             else if(point >= 80)
29             {
30                 document.write("良好");
31             }
32             else if(point > = 70)
33             {
34                 document.write("中等");
35             }
36             else if(point >= 60)
37             {
38                 document.write("及格");
39             }
40             else
41             {
42                 document.write("不及格");
43             }
44         }
45         </script>
46     </head>
47     <body>
48     </body>
49 </html>

==============================

 1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 2 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-cn">
 3 <head>
 4     <meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
 5     <title>数组</title>
 6     <meta name="keywords" content="关键字列表" />
 7     <meta name="description" content="网页描述" />
 8     <link rel="stylesheet" type="text/css" href="" />
 9     <style type="text/css"></style>
10 
11 </head>
12 <body>
13         <script type="text/javascript">
14         var user = new Array("周更生","男",30,"已婚","大专",5000,500,5500,"undefined","山东省");
15         document.write("姓名:"+user[0]+"</br>");
16         document.write("性别:"+user[1]+"</br>");
17         document.write("年龄:"+user[2]+"</br>");
18         document.write("婚否:"+user[3]+"</br>");
19         document.write("学历:"+user[4]+"</br>");
20         document.write("工资:"+user[5]+"</br>");
21         document.write("奖金:"+user[6]+"</br>");
22         document.write("实发工资:"+user[7]+"</br>");
23         document.write("毕业院校:"+user[8]+"</br>");
24         document.write("籍贯:"+user[9]+"</br>");
25     </script>
26 </body>
27 </html>

=========================

 1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 2 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-cn">
 3 <head>
 4     <meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
 5     <title>二维数组</title>
 6     <meta name="keywords" content="关键字列表" />
 7     <meta name="description" content="网页描述" />
 8     <link rel="stylesheet" type="text/css" href="" />
 9     <style type="text/css"></style>
10     <script type="text/javascript">
11         var arr = [  
12             ["周更生","男",30,true,"大专",5000,500,,"山东省"],
13             ["刘晓庆","女",26,false,"研究生",8000,1500,"北京科技大学","山西省"],
14             ["平","男",38,true,"大专",1000,250,"清华大学","陕西省"],
15             ["李克强","女",34,true,"高中",11000,30,"河北大学","江苏省"],
16           ];
17           
18          var _length = arr.length;
19          var str = "<table align=center width = 600px border = 1px style = 'border-collapse:collapse'>";
20              str += "<caption><h2>2014学生信息表</h2></caption>";
21                 for(var row = 0;row<_length;row++)
22                 {
23                     str += "<tr align = center>";
24                     for(var low = 0;low<arr[row].length;low++)
25                     {
26                     str += "<td>"+arr[row][low]+"</td>";
27                     }
28                     str += "</tr>";
29                 }
30              str += "</table>";
31         document.write(str);
32     </script>
33 </head>
34 <body>
35     
36 </body>
37 </html>

===============================

 1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 2 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-cn">
 3 <head>
 4     <meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
 5     <title>冒泡排序</title>
 6     <meta name="keywords" content="关键字列表" />
 7     <meta name="description" content="网页描述" />
 8     <link rel="stylesheet" type="text/css" href="" />
 9     <style type="text/css"></style>
10     <script type="text/javascript">
11         //求极值和位置
12         var _max_min = new Array(10,4,15,2,6,9);
13         var _length = _max_min.length;
14         var _min = 0;
15         //Min
16         for(var i = 0;i<_length;i++)
17         {
18             for(var j = 0;j<_length-1;j++)
19             {
20                 if(_max_min[j]>_max_min[j+1])
21                 {
22                     _min = _max_min[j+1];
23                     _max_min[j+1] = _max_min[j];
24                     _max_min[j] = _min;
25                 }
26             }
27         }
28         document.write(_max_min+"<br/>"+_min);
29 
30     </script>
31 </head>
32 <body>
33 
34 </body>
35 </html>

==================================

 1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 2 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-cn">
 3 <head>
 4     <meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
 5     <title>7号第一题</title>
 6     <meta name="keywords" content="关键字列表" />
 7     <meta name="description" content="网页描述" />
 8     <link rel="stylesheet" type="text/css" href="" />
 9     <style type="text/css"></style>
10     <script type="text/javascript">
11         //求出此数组中最大的数与最小的数及最大的数与最小的数的位置
12         var arr1 = [10,4,20,15,6,9];
13         //记录最大数;
14         var _max = 0;
15         var _maxP = 0;
16         //记录最小数;
17         var _min = arr1[0];
18         var _minP = 0; 
19         function max()
20         {
21             for(var i = 0;i < arr1.length; i++)
22             {
23                 if(_max<arr1[i])
24                 {
25                     _max = arr1[i];
26                     _maxP = i;
27                 }
28                 if(_min>arr1[i])
29                 {
30                     _min = arr1[i];
31                     _minP = i;
32                 }
33             }
34         }
35         max();
36         document.write(_max+"</br>");
37         document.write(_maxP+"</br>");
38         document.write(_min+"</br>");
39         document.write(_minP);
40     </script>
41 </head>
42 <body>
43 
44 </body>
45 </html>

==========================

 1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 2 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-cn">
 3 <head>
 4     <meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
 5     <title>7号第二题</title>
 6     <meta name="keywords" content="关键字列表" />
 7     <meta name="description" content="网页描述" />
 8     <link rel="stylesheet" type="text/css" href="" />
 9     <style type="text/css"></style>
10     <script type="text/javascript">
11         function getnum(a,b,c)
12         {
13             return a+ b+ c;
14         }
15         document.write(getnum(10,20,30));
16     </script>
17 </head>
18 <body>
19 
20 </body>
21 </html>

================

 1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 2 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-cn">
 3 <head>
 4     <meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
 5     <title>7号第三题</title>
 6     <meta name="keywords" content="关键字列表" />
 7     <meta name="description" content="网页描述" />
 8     <link rel="stylesheet" type="text/css" href="" />
 9     <style type="text/css"></style>
10     <script type="text/javascript">
11         function _m()
12         {
13             //行
14             for(var row = 1;row<=9;row++)
15             {
16                 for(var low = 1;low<=row;low++)
17                 {
18                     document.write(low+"*"+row+"="+(low*row));
19                 }
20                 low=1;
21                 document.write("</br>");
22             }
23         }
24         _m();
25     </script>
26 </head>
27 <body>
28 
29 </body>
30 </html>

==============================

 1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 2 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-cn">
 3 <head>
 4     <meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
 5     <title>7号第四题</title>
 6     <meta name="keywords" content="关键字列表" />
 7     <meta name="description" content="网页描述" />
 8     <link rel="stylesheet" type="text/css" href="" />
 9     <style type="text/css"></style>
10     <script type="text/javascript">
11         //定义一个数组 这个数组中有9个元素 然后将这个数组中的元素为奇数的平均值求出来
12         var _array = new Array(1,2,3,4,5,6,7,8,9);
13         var _mean =0;
14         var _J =0;
15         for(var Index = 0;Index<_array.length;Index++)
16         {
17             if(_array[Index]%2!==0)
18             {
19                 _mean += _array[Index];
20                 _J++;
21             }
22         }
23         document.write(_mean/_J);
24     </script>
25 </head>
26 <body>
27 
28 </body>
29 </html>

=========================

 1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 2 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-cn">
 3 <head>
 4     <meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
 5     <title>7号第五题</title>
 6     <meta name="keywords" content="关键字列表" />
 7     <meta name="description" content="网页描述" />
 8     <link rel="stylesheet" type="text/css" href="" />
 9     <style type="text/css"></style>
10     <script type="text/javascript">
11     //创建一个函数 实现两个数之间的加减乘除运算 并将结果返回
12         
13         function _Num(num1,num2){    
14             var arr = new Array();
15             arr[0]=num1+num2;
16             arr[1]=num1-num2;
17             arr[2]=num1*num2;
18             arr[3]=num1/num2;
19 
20             return arr;
21         }
22         alert(_Num(1,2)[0]);
23     </script>
24 </head>
25 <body>
26 
27 </body>
28 </html>

===========================

 1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 2 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-cn">
 3 <head>
 4     <meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
 5     <title>网页标题</title>
 6     <meta name="keywords" content="关键字列表" />
 7     <meta name="description" content="网页描述" />
 8     <link rel="stylesheet" type="text/css" href="" />
 9     <style type="text/css"></style>
10     <script type="text/javascript">
11         //创建一个函数 实现判断用户名中是否含有特殊符号   如果有则提示用户名不合法 没有则提示用户名合法 (有基础的可以尝试做一下 )   
12         //var str = “zhang#shuai”    //字符串的访问方式与数组是一样的  字符串它也可以通过下标来进行访问
13         
14         function _user(str)
15         {
16             //感觉应该使用for?
17             //使用正则表达式:RegExp(指定索引关键字)test(索引字符串中的指定值)
18             var _p = new RegExp("!");
19             var _bool = _p.test(str);
20             if(_bool==true)
21             {
22                 document.write("有特殊字符");
23             }
24             else
25             {
26                 document.write("没有特殊字符");
27             }
28         }
29 
30         _user("zhang!shuai");
31     </script>
32 </head>
33 <body>
34 
35 </body>
36 </html>

===================

 1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 2 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-cn">
 3 <head>
 4     <meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
 5     <title>7号第7题</title>
 6     <meta name="keywords" content="关键字列表" />
 7     <meta name="description" content="网页描述" />
 8     <link rel="stylesheet" type="text/css" href="" />
 9     <style type="text/css"></style>
10     <script type="text/javascript">
11         function _row()
12         {
13             //上半部分
14         for(var i=9;i>=2;i--){
15             for(var j=1;j<=i;j++){
16                 document.write(i);
17             }
18             document.write("<br/>");
19         
20         }
21         for(var i=1;i<10;i++){
22             for(var j=1;j<=i;j++){
23                 document.write(i);
24             }
25             document.write("<br/>");
26         
27         }
28         }
29         _row();
30     </script>
31 </head>
32 <body>
33 
34 </body>
35 </html>

======================================

 1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 2 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-cn">
 3 <head>
 4     <meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
 5     <title>合并数组</title>
 6     <meta name="keywords" content="关键字列表" />
 7     <meta name="description" content="网页描述" />
 8     <link rel="stylesheet" type="text/css" href="" />
 9     <style type="text/css"></style>
10 </head>
11 <body>
12         <script type="text/javascript">
13             //使用concat()方法来合并数组;
14             var arr_0 = new Array(3);
15             arr_0[0] = "A";
16             arr_0[1] = "B";
17             arr_0[2] = "C";
18 
19             var arr_1 = new Array(3);
20             arr_1[0] = "D";
21             arr_1[1] = "E";
22             arr_1[2] = "F";
23 
24             document.write(arr_0.concat(arr_1));
25         </script>
26 </body>
27 </html>

=================================

 1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 2 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-cn">
 3 <head>
 4     <meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
 5     <title>数组合并成字符串</title>
 6     <meta name="keywords" content="关键字列表" />
 7     <meta name="description" content="网页描述" />
 8     <link rel="stylesheet" type="text/css" href="" />
 9     <style type="text/css"></style>
10     <script type="text/javascript">
11         //使用join()方法  括号内是以什么方式连接在一起
12         var arr = new Array("a","b","c");
13         document.write(arr.join()+"</br>");
14         document.write(arr.join("")+"</br>");
15         document.write(arr.join("."));
16     </script>
17 </head>
18 <body>
19 
20 </body>
21 </html>

================================

 1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 2 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-cn">
 3 <head>
 4     <meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
 5     <title>Array对象属性</title>
 6     <meta name="keywords" content="关键字列表" />
 7     <meta name="description" content="网页描述" />
 8     <link rel="stylesheet" type="text/css" href="" />
 9     <style type="text/css"></style>
10     <script type="text/javascript">
11     /*
12         拥有三个对象属性：
13         1、constructor    返回对创建此对象的数组函数的引用
14         2、length        设置或返回数组中的元素数目
15         3、prototype    使您有能力向对象添加属性和方法
16     */
17     //constructor 属性 例子一
18     /*
19     var test  = new Array();
20     if(test.constructor==Array)
21     {
22         document.write("This is a Array");
23     }
24     if(test.constructor==Boolean)
25     {
26         document.write("This is a Boolean");
27     }
28     if(test.constructor==Date)
29     {
30         document.write("This is a Date");
31     }
32     if(test.constructor==String)
33     {
34         document.write("This is a String");
35     }
36     */
37     </script>
38 </head>
39 <body>
40 
41 </body>
42 </html>

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原文地址：https://www.cnblogs.com/YeYunRong/p/6143149.html