直面坑爹的前端面试

来源：互联网发布：js页面刷新计数器编辑：程序博客网时间：2024/05/16 00:31

参考：http://www.zhufengpeixun.cn/JavaScriptmianshiti/2014-02-28/271.html

<!DOCTYPE html><html>    <head>        <meta charset="UTF-8">        <title></title>        <script type="text/javascript">            function A(){                this.say=function(){                    console.log("我是1");                }            }            function B(){                this.say=function(){                    console.log("我是2");                }            }            var a=new A();            var b=new B();            a.say.call(b);    //我是1        </script>    </head>    <body>    </body></html>

<!DOCTYPE html><html>    <head>        <meta charset="UTF-8">        <title></title>        <script type="text/javascript">            function A(){                this.name='SB';                this.say=function(){                    console.log("我是1");                }            }            function B(){                A.call(this);                this.say=function(){                    console.log("我是2");                }            }            var a=new A();            var b=new B();            console.log(b.name);  //SB            b.say();         //我是2            a.say.call(b);    //我是1        </script>    </head>    <body>    </body></html>

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