如何检查javascript变量是否为函数类型？ [英] How can I check if a javascript variable is function type?

问题描述

假设我有任何变量，其定义如下：

Suppose I have any variable, which is defined as follows:

var a = function() {/* Statements */};

我想要一个检查变量类型是否类似函数的函数。即：

I want a function which checks if the type of the variable is function-like. i.e. :

function foo(v) {if (v is function type?) {/* do something */}};
foo(a);

如何以上面定义的方式检查变量'a'是否为type函数？

How can I check if the variable 'a' is of type function in the way defined above?

推荐答案

当然，下划线的方式更有效率，但是当效率不是问题时，最好的检查方法是写在下划线上由@Paul Rosania链接的页面。

Sure underscore's way is more efficient, but the best way to check, when efficiency isn't an issue, is written on underscore's page linked by @Paul Rosania.

受到下划线的启发，最终的isFunction函数如下：

Inspired by underscore, the final isFunction function is as follows:

function isFunction(functionToCheck) {
 return functionToCheck && {}.toString.call(functionToCheck) === '[object Function]';
}

这篇关于如何检查javascript变量是否为函数类型？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IT屋！