变量名称长度与性能 [英] Variable name length vs performance

问题描述

如何可能，变量名称长度的巨大差异不会导致javascript中任何性能下降？

How is it possible, that a huge difference in variable name length won't cause any performance loss in javascript?

宣布 var a = 0; 需要相同的时间来声明 var aaaaaaaaaaaaaaaa = 0;
即使用它们执行计算也需要相同的时间。

It takes the same time to declare var a = 0; as it takes to declare var aaaaaaaaaaaaaaa = 0; It takes the same time even to execute computations with them.

我的小提示演示

推荐答案

基于@ Cerbrus的评论：

它在实践中导致可忽略小的性能差异，但仅在声明变量时。
之后，它会在内存中获得特定的地址，并将其称为此地址，而不是变量名，所以它不会再影响性能。

It causes a negligibly small performance difference in practise, but only when declaring the variable. Afterwards, it gets a specific address in the memory, and it is referred as this address, not the variable name, so it won't affect the performance anymore.

但是，谈论脚本语言主要用于Web，较短的变量名称可以减少文件大小，并加快页面加载速度。这是JS编译器的功能之一，例如 Google的。

However, talking about a scripting language used mostly on web, shorter variable names can reduce the filesize, and speed up pageloads. This is one of the features of the JS compilers, such as Google's.

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