this指针的初运用

this一般运用场景：

1.位于函数中，谁调用指向谁

var make = "mclaren";

var model = "720s"

function fullname() {

console.log(this.make + " " + this.model);

}

var car = {

make: "lamborghini",

model: "huracán",

fullname: function () {

console.log(this.make + " " + this.model);

}

}

car.fullname(); // lmborghini huracán

window.fullname(); // mclaren 720s

fullname(); // mclaren 720s

 

2.事件调用，指向调用元素

<button onclick="this.style.display='none'">

remove me!

</button>

 

3.方法中调用

var car = {

make: "lamborghini",

model: "huracán",

fullname: function () {

console.log(this.make + " " + this.model);

console.log(car.make + " " + car.model);

}

}

car.fullname();

 

4.直接使用this,则默认全局