Augmented implementation in JavaScript

最新推荐文章于 2025-08-10 19:50:19 发布

转载最新推荐文章于 2025-08-10 19:50:19 发布 · 49 阅读

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原文链接：http://www.cnblogs.com/chuwachen/archive/2013/03/09/3911029.html

文章标签：

#javascript #ViewUI

本文介绍了一种使用自执行函数增强实现的JavaScript计算器。该计算器通过多次调用自身来累积功能，首次加载时会传递空对象，之后则传递已有的计算器对象。最终实现了包括加、减、乘、除和双倍计算在内的五个功能。

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For js, usually use augmented implementation for function as follows (self execute), the advantage are: if you function has a calculator function, and third party also has a calculator function, the calculator will include all the functions both from yours and third party. In the following code, the calculator will finally have 5 functions. When calculator is loaded for the first time, it will pass "{}" as argument because window.calculator is null, for the second time and then on, it will pass "window.calculator" as argument. If you want to let other places outside that function to use the variables or functions, you must return those variables or functions as object.

 var calculator = (function (math) {  
   math.add = function (a, b) {  
      return a + b;  
   };  
  
   math.subtract = function (a, b) {  
      return a - b;  
   };  
  
   math.multiply = function (a, b) {  
      return a * b;  
   };  
  
   math.divide = function (a, b) {  
      return a / b;  
   };  
  
   return math;  
})(window.calculator || {});  
  
var calculator = (function (math) {  
   math.doubled = function (a, b) {  
      return (a + b) * 2;  
   };  
  
   return math;  
})(window.calculator || {});

转载于:https://www.cnblogs.com/chuwachen/archive/2013/03/09/3911029.html