你应该知道的 javascript面试题 --- 持续更新

var myObject = {
    foo: "bar",
    func: function() {
        var self = this;
        console.log("outer func:  this.foo = " + this.foo);  // bar
        console.log("outer func:  self.foo = " + self.foo);  // bar
        (function() {
            console.log("inner func:  this.foo = " + this.foo); // undefined
            console.log("inner func:  self.foo = " + self.foo); // bar
        }());
    }
};

myObject.func();

var a=10;
var foo={
  a:20,
  bar:function(){
      var a=30;
      return this.a;
    }
}
foo.bar() // 20
(foo.bar)() // 20
(foo.bar=foo.bar)() //10
(foo.bar,foo.bar)() // 10