JS应用实例1：表格各行换色

效果如下：
 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <title>Title</title>
 6 </head>
 7 <style>
 8     td,th{
 9         border: 1px solid gray;
10         text-align: center;
11     }
12     <!-- 表格偶数行换色（奇数行换色把even改成odd）-->
13     table tr:nth-child(even){
14         background-color:darkseagreen;
15     }
16 </style>
17 <body>
18 <script>
19     //边框闪烁函数
20     function flashit() {
21         if(myexample.style.borderColor=="red"){//通过id为myexample调出其边框颜色判断
22             myexample.style.borderColor="green";
23         }else if(myexample.style.borderColor=="green"){
24             myexample.style.borderColor="blue";
25         }else {
26             myexample.style.borderColor="red"
27         }
28     }
29     setInterval("flashit()",500);//每0.5秒调用一次
30     //鼠标经过、移出、点击颜色改变函数
31     function changColor(id,flag) {
32         if(flag=="over"){
33             if(document.getElementById(id).style.backgroundColor!="red")//判断传入此id的标签的背景色是否红色
34                 document.getElementById(id).style.backgroundColor="pink";
35         } else if(flag=="click") {
36             if (document.getElementById(id).style.backgroundColor != "red")
37                 document.getElementById(id).style.backgroundColor = "red";
38             else
39                 document.getElementById(id).style.backgroundColor = "green";
40 
41         }else if(flag=="out"){
42             if(document.getElementById(id).style.backgroundColor!="red")
43                 document.getElementById(id).style.backgroundColor="green";
44         }
45     }
46 </script>
47 <table id="myexample" style="border: 2px solid red; 500px;" cellspacing="0" cellpadding="0"><!--定义边框样式及消除单元格之间空隙-->
48     <tr id="1" style="background-color: #c9bbff" onmouseover="changColor(1,'over')" onmouseout="changColor(1,'out')"onclick="changColor(1,'click')">
49         <th>编号</th>
50         <th>姓名</th>
51         <th>年龄</th></tr>
52     <tr id="2" onmouseover="changColor(2,'over')" onmouseout="changColor(2,'out')" onclick="changColor(2,'click')">    <!--当鼠标触发经过、移出、点击事件后调用函数-->
53         <td>1</td>
54         <td>张三</td>
55         <td>22</td></tr>
56     <tr id="3" onmouseover="changColor(3,'over')" onmouseout="changColor(3,'out')"onclick="changColor(3,'click')">
57         <td>2</td>
58         <td>李四</td>
59         <td>34</td></tr>
60     <tr id="4" onmouseover="changColor(4,'over')" onmouseout="changColor(4,'out')"onclick="changColor(4,'click')">
61         <td>3</td>
62         <td>王武</td>
63         <td>45</td></tr>
64     <tr id="5" onmouseover="changColor(5,'over')" onmouseout="changColor(5,'out')"onclick="changColor(5,'click')">
65         <td>4</td>
66         <td>小二</td>
67         <td>22</td></tr>
68     <tr id="6" onmouseover="changColor(6,'over')" onmouseout="changColor(6,'out')"onclick="changColor(6,'click')">
69         <td>5</td>
70         <td>刘六</td>
71         <td>32</td></tr>
72 </table>
73 </body>
74 </html>
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