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                            通過自調用函數產生一個隨機數對象，在自調用函數外面，調用該隨機數方法產生隨機數

```
// 自調用函數，產生全局構造函數 Random
(function (window) {
  function Random() {

  }
  // 在原型對象中添加方法，產生隨機數
  Random.prototype.getRandom = function () {
    return Math.floor(Math.random()*5);
  }
  // 將構造函數 Random 提升到全局
  window.Random = Random;
})(window)
// new 一個 Random 對象
var random = new Random();
console.log(random.getRandom()); // 0, 1, 2, 3, 4
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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