原型繼承
//無法實現(xiàn)多重繼承,創(chuàng)建了一個子類的實例
//如果對子類實例的屬性進(jìn)行了修改惫周，那么創(chuàng)建其他子類的時候都會受到影響
function superfunc(){
this.name = "baiying";
this.age = 18;
this.getName = function(){
alert(this.age +"歲的"+this.name);
}
}
function sub(){
this.hobby = 'eat';
}
sub.prototype = new superfunc();
var huanglizhen = new sub();
console.log(huanglizhen.hobby); //eat
huanglizhen.getName();//alert "18歲的baiying"
借用構(gòu)造函數(shù):可傳參
function superfunc1(){
this.name = "baiying";
this.age = 18;
this.getName = function(){
alert(this.age +"歲的"+this.name);
}
}
function sub1(){
this.hobby = 'eat';
superfunc1.call(this);
}
var huanglizhen = new sub();
console.log(huanglizhen.hobby); //eat
huanglizhen.getName();//alert "18歲的baiying"
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