// 构造函数 this指向实例对象

function Foo () {

this.name = 'foo'

console.log('Foo this', this)

console.log('Foo this === Foo', this === Foo)

}

var objF = new Foo()

// 作为一个对象的属性

var obj = {

name: 'obj',

printName: function () {

console.log('obj this', this.name)

}

}

obj.printName()

// 普通函数中的 this

function fn () {

console.log('fn this', this)

}

fn()

// call apply this

function fn1 (arg1, arg2) {

console.log('fn1 this.name', this.name)

console.log('arg1, arg2', arg1, arg2)

console.log('fn1 this', this)

}

fn1.call({ name: 'call' }, 'call1', 'call2')

fn1.apply({ name: 'apply' }, ['apply1', 'apply2'])

var fn2 = fn1.bind({ name: 'bind' })

fn2('fn2', 'fn2')