[翻译]High Performance JavaScript(014)
Recursion Patterns 递归模式
When you run into a call stack size limit, your first step should be to identify any instances of recursion in the code. To that end, there are two recursive patterns to be aware of. The first is the straightforward recursive pattern represented in the factorial() function shown earlier, when a function calls itself. The general pattern is as follows:
当你陷入调用栈尺寸限制时，第一步应该定位在代码中的递归实例上。为此，有两个递归模式值得注意。首先是直接递归模式为代表的前面提到的factorial()函数，即一个函数调用自身。其一般模式如下：
function recurse(){
recurse();
}
recurse();
This pattern is typically easy to identify when errors occur. A second, subtler pattern involves two functions:
当发生错误时，这种模式比较容易定位。另外一种模式称为精巧模式，它包含两个函数：
function first(){
second();
}
function second(){
first();
}
first();
In this recursion pattern, two functions each call the other, such that an infinite loop is formed. This is the more troubling pattern and a far more difficult one to identify in large code bases.
在这种递归模式中，两个函数互相调用对方，形成一个无限循环。这是一个令人不安的模式，在大型代码库中定位错误很困难。
Most call stack errors are related to one of these two recursion patterns. A frequent cause of stack overflow is an incorrect terminal condition, so the first step after identifying the pattern is to validate the terminal condition. If the terminal condition is correct, then the algorithm contains too much recursion to safely be run in the browser and should be changed to use iteration, memoization, or both.
大多数调用栈错误与这两种模式之一有关。常见的栈溢出原因是一个不正确的终止条件，所以定位模式错误的第一步是验证终止条件。如果终止条件是正确的，那么算法包含了太多层递归，为了能够安全地在浏览器中运行，应当改用迭代，制
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面向对象的语言多数都支持继承，继承最重要的优点就是代码复用，从而构建大型软件系统。如果一个类能够重用另一个类的属性和或方法，就称之为继承。
从这个角度来看看js的继承方式。js中继承方式与写类方式息息相关。不同的写类方式造成不同的继承方式。各种流行js库继承方式也各不相同。从最简单的
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