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      2. JavaScript中有常量吗?

        Are there constants in JavaScript?(JavaScript中有常量吗?)
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                2. 本文介绍了JavaScript中有常量吗?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

                  问题描述

                  有没有办法在 JavaScript 中使用常量?

                  Is there a way to use constants in JavaScript?

                  如果不是,指定用作常量的变量的常见做法是什么?

                  If not, what's the common practice for specifying variables that are used as constants?

                  推荐答案

                  自ES2015,JavaScript 有一个 <代码>常量:

                  Since ES2015, JavaScript has a notion of const:

                  const MY_CONSTANT = "some-value";
                  

                  这将适用于几乎所有浏览器,除了 IE 8、9 和 10.有些可能还需要启用严格模式.

                  This will work in pretty much all browsers except IE 8, 9 and 10. Some may also need strict mode enabled.

                  您可以将 var 与 ALL_CAPS 等约定一起使用,以表明如果您需要支持旧版浏览器或使用旧代码,则不应修改某些值:

                  You can use var with conventions like ALL_CAPS to show that certain values should not be modified if you need to support older browsers or are working with legacy code:

                  var MY_CONSTANT = "some-value";
                  

                  这篇关于JavaScript中有常量吗?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持跟版网!

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