Home > Others

function inside the function is called the closure of the function: the child function can call the parent function variable, if the child function cannot find the variable, then the entire scope chain of variables will be saved

Source: Internet
Author: User
Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞ 

1 <!DOCTYPE HTML>2 <HTML>3 <Head>4 <Metahttp-equiv= "Content-type"content= "text/html; charset=utf-8">5 <title>Untitled Document</title>6 <Script>7     //Scope8     vara=0;9     Ten     functionABC () { One         vara=1; A alert (a); -         functionC () { - alert (a); the         } - C () -     } -       + ABC () -     //alert (a) + //alert (a); A </Script> at </Head> -  - <Body> - </Body> - </HTML>

Results: Two times a=1 was popped;

Explanation: First executes the function ABC (), A=1 is the local variable inside, takes precedence over the global variable, so the first time alert result is ABC's 1;

Then execute the function C (), Functions C is a sub-function of ABC, and function C does not have a variable, so it will go to his parent, that is, the variable var a=1 abc, then the C pop-up is also 1.

function inside the function is called the closure of the function: the child function can call the parent function variable, if the child function cannot find the variable, then the entire scope chain of variables will be saved

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
get the permalink function variable php call function from variable extjs call parent function php call parent function php function inside function closure function

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

What's Trending
Top 10 Tags
datastax versions naming convention zookeeper client class definition md5 microsoft sql server 2005 data structures exception handling error handling
Top 10 Keywords
microsoft download center down wordpress address url site address url wordpress address url windows installer 4 0 download 302 not found web address url definition site address url wordpress db2 integer mac os installation step by step pdf abbreviation for return

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

  • Sales Support

    1 on 1 presale consultation

    Chat Contact Sales

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

    Open a Ticket

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

    Learn More