直面坑爹的前端面试

╰+哭是因爲堅強的太久メ 2022-07-15 23:56 158阅读 0赞

## 参考：[http://www.zhufengpeixun.cn/JavaScriptmianshiti/2014-02-28/271.html][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>

[http_www.zhufengpeixun.cn_JavaScriptmianshiti_2014-02-28_271.html]: http://www.zhufengpeixun.cn/JavaScriptmianshiti/2014-02-28/271.html