var obj = {
 name : 'linxin'
}
function func(firstName, lastName){
 console.log(firstName + ' ' + this.name + ' ' + lastName);
}
func.apply(obj, ['A', 'B']); // A linxin B

var obj = {
 name: 'linxin'
}
function func(firstName, lastName) {
 console.log(firstName + ' ' + this.name + ' ' + lastName);
}
func.call(obj, 'C', 'D');  // C linxin D

var obj = {
 name: 'linxin'
}
function func() {
 console.log(this.name);
}
func.call(obj);  // linxin

function func() {
 console.log(obj.name);
}

var Person1 = function () {
 this.name = 'linxin';
}
var Person2 = function () {
 this.getname = function () {
  console.log(this.name);
 }
 Person1.call(this);
}
var person = new Person2();
person.getname();  // linxin

function func() {
 console.log('linxin');
}
func.call();   // linxin

var obj = {
 name: 'linxin'
}
function func() {
 console.log(this.name);
}
var func1 = func.bind(obj);
func1();      // linxin

function func(a, b, c) {
 console.log(a, b, c);
}
var func1 = func.bind(null,'linxin');
func('A', 'B', 'C');   // A B C
func1('A', 'B', 'C');   // linxin A B
func1('B', 'C');    // linxin B C
func.call(null, 'linxin');  // linxin undefined undefined

if (!Function.prototype.bind) {
 Function.prototype.bind = function () {
  var self = this,      // 保存原函数
   context = [].shift.call(arguments), // 保存需要绑定的this上下文
   args = [].slice.call(arguments); // 剩余的参数转为数组
  return function () {     // 返回一个新函数
   self.apply(context,[].concat.call(args, [].slice.call(arguments)));
  }
 }
}