javascript 中this的理解
var test = "window's test";var foo = function(){ var test ="foo's test"; alert(this == window); // false,这里的this 指向new关键字生成的对象; alert(this.test); //undefined; return function(){ var test = "foo's inner test"; alert(this == window); // true ,this 指向调用该匿名函数的对象，即window对象; alert(this.test); // "window's test"; }}var t = new foo();t(); // 等价于 window.t(); var bar = { test : "bar's test", method: function(){ alert(this == window); // false,这里的this 指bar; return this.test; //"bar's test"; }}bar.method(); // false , "bar's test";总结：this始终指向调用this所在函数的对象
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