未加星标

JavaScript has no Else If

字体大小 | |
[前端(javascript) 所属分类 前端(javascript) | 发布者 店小二05 | 时间 2017 | 作者 红领巾 ] 0人收藏点击收藏

Surprised? Read on.

The following code might be very familiar to you, in fact I write this too a lot.

if (a > b) { return 1; } else if (b > a) { return -1; } else { return 0 }

However what javascript actuallyparses is shown below

if (a > b) { return 1; } else { if (b < a) { return -1; } else { return 0 } }

Same end result but closer to the underlying language semantics.

Why?

JavaScript allows if/else conditionals to omit the wrapping braces some actually argue this is a neater style due to its terseness.

A contrived example is shown below.

if (a > b) return 1; else return -1;

Consequently it follows that the else in the else if line is actually omitting its {} wrappers.

So whenever you write else if , you are technically not following the rule of always usingbraces. Not saying it is a bad thing though…

References MDN article ES5 spec Related

本文前端(javascript)相关术语:javascript是什么意思 javascript下载 javascript权威指南 javascript基础教程 javascript 正则表达式 javascript设计模式 javascript高级程序设计 精通javascript javascript教程

主题: JavaScriptJava
分页:12
转载请注明
本文标题:JavaScript has no Else If
本站链接:http://www.codesec.net/view/533758.html
分享请点击:


1.凡CodeSecTeam转载的文章,均出自其它媒体或其他官网介绍,目的在于传递更多的信息,并不代表本站赞同其观点和其真实性负责;
2.转载的文章仅代表原创作者观点,与本站无关。其原创性以及文中陈述文字和内容未经本站证实,本站对该文以及其中全部或者部分内容、文字的真实性、完整性、及时性,不作出任何保证或承若;
3.如本站转载稿涉及版权等问题,请作者及时联系本站,我们会及时处理。
登录后可拥有收藏文章、关注作者等权限...
技术大类 技术大类 | 前端(javascript) | 评论(0) | 阅读(46)