javascript - 获得Javascript变量类型的更好方法？(Better way to get type of a Javascript variable?)

Question

Is there a better way to get the type of a variable in JS than typeof ?

(有没有比typeof更好的方法来获取JS中的变量类型？)

It works fine when you do:

(当您这样做时，它可以正常工作：)

> typeof 1
"number"
> typeof "hello"
"string"

But it's useless when you try:

(但是当您尝试以下操作时，它是没有用的：)

> typeof [1,2]
"object"
>r = new RegExp(/./)
/./
> typeof r
"function"

I know of instanceof , but this requires you to know the type beforehand.

(我知道instanceof ，但这需要您事先知道类型。)

> [1,2] instanceof Array
true
> r instanceof RegExp
true

Is there a better way?

(有没有更好的办法？)

  ask by Aillyn translate from so

Answer 1

Angus Croll recently wrote an interesting blog post about this -

(Angus Croll最近写了一篇有趣的博客文章-)

http://javascriptweblog.wordpress.com/2011/08/08/fixing-the-javascript-typeof-operator/

(http://javascriptweblog.wordpress.com/2011/08/08/fixing-the-javascript-typeof-operator/)

He goes through the pros and cons of the various methods then defines a new method 'toType' -

(他介绍了各种方法的优缺点，然后定义了一个新方法“ toType”-)

var toType = function(obj) {
  return ({}).toString.call(obj).match(/s([a-zA-Z]+)/)[1].toLowerCase()
}