js中this关键字的使用

<script>//题目一：理解r1与r2的输出function addFactory(){var adder = 5;return function(data){adder += data;return adder;}}var adder1 = addFactory();var r1 = adder1(1);//console.log(r1); r1 = adder1(1);//console.log(r1);var adder2 = addFactory();var r2 = adder2(2);//console.log(r2); r2 = adder2(2);//console.log(r2);//题目二：下面的代码输出什么var name = "The Window";var object = {name : "My Object",getNameFunc : function(){return function(){return this.name;};}};alert(object.getNameFunc()());//题目三：var name = "The Window";var object = {name : "My Object",getNameFunc : function(){var that = this;return function(){return that.name;};}};//alert(object.getNameFunc()());</script>

 

转载于:https://www.cnblogs.com/goldlong/p/7904356.html

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