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="en">
3 <head>
4 <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
5 <title>改变作用域</title>
6 <script type="text/javascript">
7 var o1={ handle:'xxxx'};
8 function whoAmI(){
9 return this.handle;
10 }
11 o1.identifyMe=whoAmI;
12 console.log(o1.identifyMe());
13 console.log(whoAmI.call(o1));
14 console.log(whoAmI.apply(o1));
15 </script>
16 </head>
17 <body>
18 </body>
19 </html>
通过apply或者call改变作用域，三者的结果是一样的，都会输出xxxx
转载于:https://www.cnblogs.com/positive/p/3441091.html