摘要：javascript里面的this是初学者经常遇到的一个令人费解的关键字，尤其在有多层函数或者回调里面，目前为止，我把this理解为调用当前函数的对象。比如对象a里面有func1和func2，func1里面用this调用了func2，这里的this就可以理解为对象a，而如果func2里面也有this... 阅读全文

摘要：// World Geodetic System ==> Mars Geodetic System var pi = 3.14159265358979324; // var a = 6378245.0; var a = 6378245.0; var f = 1/298.3; ... 阅读全文

摘要：（一）1.闭包的本质A closure is a special kind of object that combines two things: a function, and the environment in which that function was created.2.闭包的作用A ... 阅读全文