前端-对js原型继承的简单举例

function A(name,color){

this.name=name;

this.color=color;

 

}

A.prototype.getColor=function(){

return this.color

}

A.prototype.getName=function(){

return this.name

}

function B(name ,color,type){

//继承方法1

A.call(this,name,color)

this.type=type

}

B.prototype.getType=function(){

return this.type

}

//继承方法2

Object.setPrototypeOf(B.prototype,A.prototype)

 

var a =new B('cc','yellow','nv')

console.log(a.name)

console.log(a.color,a.type)

// 结果 cc

// 结果 yellow nv

var b=new A('cc','yellow','nv')

console.log(b)

//结果 A {name: "cc", color: "yellow"}color: "yellow"name: "cc"__proto__: Object