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?
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";
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