call以及apply是阻碍我学习node的第一个绊脚石

var pet={
    words:‘...‘,
    speak:function(say){
        console.log(say+‘ ‘+this.words)
    }
}

var dog={
    words:‘Wang‘
};

pet.speak.call(dog,‘Speak‘); //Speak Wang

var Parent = function(){
    this.name = "yjc";
    this.age = 22;
}

var child = {};

console.log(child);//Object {} ,空对象

Parent.call(child);

console.log(child); //Object {name: "yjc", age: 22}