js分家效应

    var parents = function(){
    }
    parents.prototype.money = 200;

    var children = function(){

    }
    children.prototype = new parents();
    

    var parent = new parents();
    var child = new children();
    //分家前，父亲的就是儿子的
    parents.prototype.money = 300;
    console.log(parent.money + "," + child.money); //300,300//儿子赚钱了，父亲的是父亲的，儿子是儿子的
    children.prototype.money = 400;
    console.log(parent.money + "," + child.money);//300,400
    //从此分家，各过各的
    parents.prototype.money = 300;
    console.log(parent.money + "," + child.money); //300,400

    children.prototype.money = 400;
    console.log(parent.money + "," + child.money);//300,400