在javascript中键入检查 [英] type checking in javascript

问题描述

如何检查变量当前是否为整数类型？我已经为此寻找了某种资源，我认为===运算符很重要，但我不确定如何检查变量是否为整数（或者是一个数组）

How can I check if a variable is currently an integer type? I've looked for some sort of resource for this and I think the === operator is important, but I'm not sure how to check if a variable is an Integer (or an Array for that matter)

推荐答案

变量永远不会是JavaScript中的整数类型 - 它不区分不同类型的数字。

A variable will never be an integer type in JavaScript — it doesn't distinguish between different types of Number.

您可以测试变量是否包含数字，以及该数字是否为整数。

You can test if the variable contains a number, and if that number is an integer.

(typeof foo === "number") && Math.floor(foo) === foo

如果变量可能是包含整数的字符串，你想看看是否是这种情况：

If the variable might be a string containing an integer and you want to see if that is the case:

foo == parseInt(foo, 10)

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