【笔记】javascript原型链继承实例

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function Shape(){
 this.name = 'shape';
 this.toString = function(){
  return this.name;
 }
}

function TwoDShape(){
 this.name = '2D shape';
}
function Triangle(side,height){
 this.name = 'Triangle';
 this.side = side;
 this.height = height;
 this.getArea = function(){
  return this.side*this.height/2;
 };
}

/* inheritance */
TwoDShape.prototype = new Shape();
Triangle.prototype = new TwoDShape();

TwoDShape.prototype.constructor = TwoDShape;
Triangle.prototype.constructor = Triangle;

<span style="font-family:Microsoft YaHei;font-size:14px;color:#333333;">function Shape(){}

Shape.prototype.name = 'shape';
Shape.prototype.toString = function(){
 return this.name;
}

function TwoDShape(){}

TwoDShape.prototype = new Shape();
TwoDShape.prototype.constructor = TwoDShape;

TwoDShape.prototype.name = '2d shape';

function Triangle(side,height){
 this.side = side;
 this.height = height;
}

Triangle.prototype = new TwoDShape;
Triangle.prototype.constructor = Triangle;

Triangle.prototype.name = 'Triangle';
Triangle.prototype.getArea = function(){
 return this.side*this.height/2;
}</span>

<span style="font-size:14px;color:#333333;">function Shape(){}

Shape.prototype.name = 'shape';
Shape.prototype.toString = function(){
 return this.name;
}

function TwoDShape(){}

TwoDShape.prototype = Shape.prototype;
TwoDShape.prototype.constructor = TwoDShape;

TwoDShape.prototype.name = '2d shape';

function Triangle(side,height){
 this.side = side;
 this.height = height;
}

Triangle.prototype = TwoDShape.prototype;
Triangle.prototype.constructor = Triangle;

Triangle.prototype.name = 'Triangle';
Triangle.prototype.getArea = function(){
 return this.side*this.height/2;
}</span>

<span style="font-size:14px;color:#333333;">function Shape(){}
Shape.prototype.name = 'shape';
Shape.prototype.toString = function(){
 return this.name;
}
function TwoDShape(){}
var F = function(){}
F.prototype = Shape.prototype;
TwoDShape.prototype = new F();
TwoDShape.prototype.constructor = TwoDShape;
TwoDShape.prototype.name = '2d shape';
function Triangle(side,height){
 this.side = side;
 this.height = height;
}
F.prototype = TwoDShape.prototype;
Triangle.prototype = new F();
Triangle.prototype.constructor = Triangle;
Triangle.prototype.name = 'Triangle';
Triangle.prototype.getArea = function(){
 return this.side*this.height/2;
}</span>

【笔记】javascript原型链继承实例

标签：

原文地址：http://blog.csdn.net/wuweitiandian/article/details/42716789