js 在嵌套函数中this关键字引用head对象

var myObject = {
  func1: function() {
    console.log(this); // myObject
    var func2  = function() {
       console.log(this); // window, 从此处开始，this都是window对象了
       var func3 = function() {
         console.log(this); // window, head
       }();
    }();
  }
}

myObject.func1();

var foo = {
  fun: function(bar) {
    console.log(this) // foo
    bar(); // window
  }
}

foo.fun(function() {console.log(this)})

var myObject =  {
  myProp: ‘hah‘,
  myMeth: function() {
    var that = this; // myMeth作用域内，保存this引用(也就是myObject)
    var helper = function() { // 子函数
      console.log(that.myProp); // hah
      console.log(this); // window
    }();
  }
}
myObject.myMeth();

var myObject = {};

var myFunction = function(p1, p2) {
  // 调用函数的时候，通过call()将this指向myObject
  this.foo = p1;
  this.bar = p2;
  console.log(this);
};

myFunction.call(myObject, ‘foo‘, ‘bar‘);

console.log(myObject); // Object {foo = ‘foo‘, bar = ‘bar‘}