<!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="Generator" content="EditPlus®"> <meta name="Author" content=""> <meta name="Keywords" content=""> <meta name="Description" content=""> <title>Document</title> </head> <body> <script type="text/javascript"> function C__construct() { this.name = ‘张三‘; } C__construct.prototype.age = ‘25岁‘; var C1 = new C__construct(); var C2 = new C__construct(); document.write(‘C1.name ‘+C1.name+‘<br/>‘); document.write(‘C2.name ‘+C2.name+‘<br/>‘); C1.name = ‘李四‘; document.write(‘改变C1.name的值后再次输出C1.name与C2.name<br/>‘); document.write(‘C1.name ‘+C1.name+‘<br/>‘); document.write(‘C2.name ‘+C2.name+‘<br/>‘); document.write(‘----------------------------------------分割线----------------------------------------<br/>‘); document.write(‘C1.age ‘+C1.age+‘<br/>‘); document.write(‘C2.age ‘+C2.age+‘<br/>‘); C__construct.prototype.age = ‘26岁‘; document.write(‘改变C__construct.prototype.age的值后再次输出C1.age与C2.age 继承的意义就在于此处<br/>‘); document.write(‘C1.age ‘+C1.age+‘<br/>‘); document.write(‘C2.age ‘+C2.age+‘<br/>‘); document.write(‘改变C1.age的值后再次输出C1.age与C2.age<br/>‘); C1.age = ‘27岁‘; document.write(‘C1.age ‘+C1.age+‘<br/>‘); document.write(‘C2.age ‘+C2.age+‘<br/>‘); </script> </body> </html>
原文：http://www.cnblogs.com/buexplain/p/4422357.html