javascript设计模式 – 外观模式原理与用法实例分

var Rectangle = function(){
  this.draw = function(){
    console.log('画一个矩形');
  }
}
 
var Circle = function(){
  this.draw = function(){
    console.log('画一个圆');
  }
}
 
var Triangle = function(){
  this.draw = function(){
    console.log('画一个三角形');
  }
}
 
var ShapeMaker = function(){
  this.rectangle = new Rectangle();
  this.circle = new Circle();
  this.triangle = new Triangle();
 
  this.drawRectangle = function(){
    this.rectangle.draw();
  }
 
  this.drawCircle = function(){
    this.circle.draw();
  }
 
  this.drawTriangle = function(){
    this.triangle.draw();
  }
}
 
var shapeMaker = new ShapeMaker();
 
shapeMaker.drawRectangle(); //画一个矩形
shapeMaker.drawCircle(); //画一个圆
shapeMaker.drawTriangle(); //画一个三角形