JS构造函数constructor

function Bird(){
    this.name = "Abird",
    this.color = "blue",
    this.numLegs = 2
}

function Bird(){
    this.name = "Abird",    //this指向所在函数的对象
    this.color = "blue",
    this.numLegs = 2
}

var bBird = new Bird();     //采用new关键字来调用构造函数
bBird.name;     //将输出“Abird”
bBird.color;    //将输出“blue”
bBird.numLegs;  //将输出“2”

bBird.name = "John";
bBird.name;     //输出“Jhon”