javascript设计模式 – 享元模式原理与用法实例分析

var redCricle = new Circle('red');
redCricle.setAttr(10,10,10);
redCricle.draw();
 
var redCricle1 = new Circle('red');
redCricle1.setAttr(1,1,100);
redCricle1.draw();
 
var redCricle2 = new Circle('red');
redCricle2.setAttr(5,5,50);
redCricle2.draw();
 
var blueCricle = new Circle('blue');
blueCricle.setAttr(1,1,50);
blueCricle.draw();
 
var blueCricle1 = new Circle('blue');
blueCricle1.setAttr(12,12,50);
blueCricle1.draw();
 
var blueCricle2 = new Circle('blue');
blueCricle2.setAttr(2,12,20);
blueCricle2.draw();
// 创建了一个对象
// 画圆： 颜色：red x:10 y:10 radius:10
// 创建了一个对象
// 画圆： 颜色：red x:1 y:1 radius:100
// 创建了一个对象
// 画圆： 颜色：red x:5 y:5 radius:50
// 创建了一个对象
// 画圆： 颜色：blue x:1 y:1 radius:50
// 创建了一个对象
// 画圆： 颜色：blue x:12 y:12 radius:50
// 创建了一个对象
// 画圆： 颜色：blue x:2 y:12 radius:20

var Circle = function(color){
  console.log('创建了一个对象');
  this.color = color;
  this.x;
  this.y;
  this.radius;
 
  this.setAttr = function(x, y, radius){
    this.x = x;
    this.y = y;
    this.radius = radius;
  }
  this.draw = function(){
    console.log('画圆： 颜色：' + this.color + ' x:' + this.x + ' y:' + this.y + ' radius:' + this.radius)
  }
}
 
var ShapeFactory = function(){
  this.circleMap = {};
  this.getCircle = function(color){
    var circle = this.circleMap[color];
    if(!circle){
      circle = new Circle(color);
      this.circleMap[color] = circle;
    }
    return circle;
  }
}
var factory = new ShapeFactory();
 
var redCricle = factory.getCircle('red');
redCricle.setAttr(10,10,10);
redCricle.draw();
 
var redCricle1 = factory.getCircle('red');
redCricle1.setAttr(1,1,100);
redCricle1.draw();
 
var redCricle2 = factory.getCircle('red');
redCricle2.setAttr(5,5,50);
redCricle2.draw();
 
var blueCricle = factory.getCircle('blue'); 
blueCricle.setAttr(1,1,50);
blueCricle.draw();
 
var blueCricle1 = factory.getCircle('blue');
blueCricle1.setAttr(12,12,50);
blueCricle1.draw();
 
var blueCricle2 = factory.getCircle('blue');
blueCricle2.setAttr(2,12,20);
blueCricle2.draw();
 
// 创建了一个对象
// 画圆： 颜色：red x:10 y:10 radius:10
// 画圆： 颜色：red x:1 y:1 radius:100
// 画圆： 颜色：red x:5 y:5 radius:50
// 创建了一个对象
// 画圆： 颜色：blue x:1 y:1 radius:50
// 画圆： 颜色：blue x:12 y:12 radius:50
// 画圆： 颜色：blue x:2 y:12 radius:20