这里this为什么指的是val对象，而不是window和函数showObj对象？this怎么理解

问题描述

<SCRIPT LANGUAGE="JavaScript">var name = "woziji";function showObj(val,params){var hanshu='dd';function _new(){alert(this.name);this.ff.call(this,params);}_new.prototype = val;return new _new();}var val = {test:'gwj',ff:function(test){this.test=test;},show:function(){alert(this.test+" -- ");}};var ss = new showObj(val,'qqqqqqq');ss.show();</SCRIPT>

解决方案

this代表当前 _new 并设置了_new属性为val，_new.prototype = val; 所以你this能访问val对象，通过 函数 call apply 都能改变 this 对象