Interpretation of the relationship between constructors, prototypes and instances

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Each constructor has a prototype object. The prototype object contains a pointer to the constructor, and the instance contains an internal pointer to the prototype object. , realize inheritance through the prototype chain

The following code example

function Parent(){

　this.hobby = 'play';

};

Parent.prototype.showHobby = function(){

Return this.hobby;

};

function Son(){

This.hobby = 'eat';

};

//Realize inheritance and inherit hobby;

Son.prototype = new Parent();

son.Prototype.showSonhobby = function(){

Return this.Sonhobby;

};

var obj = new Son();

alert(obj.showHobby());

for(var i in obj){

　document.write(i + '---' + obj[i] + '< ;br/>');

};

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