JS中apply()与call()的含义与区别

 1 window.x = 100;
 2 
 3 
 4 var obj = {};
 5 obj.x = 1;
 6 obj.test = function(a) {
 7     alert(this.x + 20 + a);
 8 }
 9 
10 
11 var abc = {};
12 abc.x = 2;
13 abc.test = function() {
14     alert(this.x + 30 + a);
15 }
16 
17 
18 obj.test(10);                 // 结果为31,this指向obj
19 obj.test.call(window, 10);         // 结果为130,this指向window
20 obj.test.call(abc, 10);         // 结果为32,this指向abc
21 
22 
23 obj.test.apply(window, [10]);    // 结果为130,this指向window
24 obj.test.apply(abc, [10])        // 结果为32,this指向abc