[Javascript] Required function arguments in Javascript

最新推荐文章于 2025-09-12 16:56:45 发布

转载最新推荐文章于 2025-09-12 16:56:45 发布 · 60 阅读

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原文链接：http://www.cnblogs.com/Answer1215/p/8330229.html

文章标签：

#javascript #ViewUI

本文介绍了一种使用JavaScript进行参数校验的方法，通过定义一个required函数来确保传递给函数的参数不是未定义的，从而避免了因缺少必要参数而导致的运行错误。

In Javascript, all function arguments are optional by default. That means if you ever forget to pass a critical parameter, the code will just fail without warning you what went wrong.

There are many workarounds for this, and in this lesson, you will learn one of the easiest and foolproof methods of solving this problem.

const required = function(param){
    throw new Error(`
        ${param} is not defined
    `)
}

const Division = function(
    a=required("a"),
    b=required("b")
){
    return a/b
}

console.log(Division(10, 2))