遇到变化点封装它！
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">
3 <head>
4 <title> change state </title>
5 <meta name="generator" content="editplus" />
6 <meta name="author" content="" />
7 <meta name="keywords" content="" />
8 <meta name="description" content="" />
9 </head>
10
11 <body>
12 <input type="button" id="execBtn" value="show1" />
13 <div id="show"></div>
14![]()
2
3
4
5
6
7
8
9
10
11
12
13
14