Home > Developer > Web Develop

Several methods of introducing JS in the page

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

The two methods that are usually most familiar to you are:

    1. Write <script type= "Text/javascript" >JS code </script> directly in the page.
    2. Introduce external files in the page <script src= "Xx.js" ></script>.

Here are a few more pages to introduce JS code:

    1. The introduction of external JS in JS, through the Document.wirite ("SCR" + "IPT src= ' xx.js ' ></scr" + "IPT" >. At this point:<script></script> is disassembled as "<SCR" + "IPT ... </scr" + "IPT" >, if not disassembled, the browser may turn the parent JS fragment off, resulting in an error.
    2. In JS reference other JS fragments, document.write ("<SCR" + "Ipt>alert (XXX) </scr" + "ipt>");
    3. Added via DOM: Var scr=document.createelement ("script"); Scr.src= "Xxx.js";

Below the test, different ways to introduce JS, the time sequence of loading:

1 <!DOCTYPE HTML>2 <HTML>3     <Head>4         <MetaCharSet= "Utf-8">5         <title></title>6         <Scriptsrc= "2.js"type= "Text/javascript"></Script>7         <Scripttype= "Text/javascript">8 document.write ("<SCR"+"Ipt>alert (4) </SCR"+"ipt>");//introduced in the fourth way9 document.write ("<SCR"+"IPT src= ' 3.js ' ></SCR"+"ipt>");//The Third way to introduceTen Alert (1); One document.write ("<SCR"+"IPT src= ' 3.js ' ></SCR"+"ipt>"); A Alert (5); -         </Script> -     </Head> the     <Body> -     </Body> - </HTML>

Execution order: 2-4-1-5-3-3

After the third and fourth exchange sequences:

1 <!DOCTYPE HTML>2 <HTML>3     <Head>4         <MetaCharSet= "Utf-8">5         <title></title>6         <Scriptsrc= "2.js"type= "Text/javascript"></Script>7         <Scripttype= "Text/javascript">8 document.write ("<SCR"+"IPT src= ' 3.js ' ></SCR"+"ipt>");//The Third way to introduce9 document.write ("<SCR"+"Ipt>alert (4) </SCR"+"ipt>");//introduced in the fourth wayTen Alert (1); One document.write ("<SCR"+"IPT src= ' 3.js ' ></SCR"+"ipt>"); A Alert (5); -         </Script> -     </Head> the     <Body> -     </Body> - </HTML>

Execution order: 2-1-5-3-4-3

You can see the Third Way: Document.wirite ("SCR" + "IPT src= ' xx.js ' ></scr" + "IPT" > Introduce JS code to execute the JS text that will be written later and directly.

At the same time, the fourth way to introduce JS execution and write directly to the text is executed sequentially.

In summary, the commonly used several ways to introduce JS code:

    1. Write <script type= "Text/javascript" >JS code </script> directly in the page.
    2. Introduce external files in the page <script src= "Xx.js" ></script>.
    3. The introduction of external JS in JS, through the Document.wirite ("SCR" + "IPT src= ' xx.js ' ></scr" + "IPT" >.
    4. In JS, refer to other JS fragments, document.write ("<SCR" + "Ipt>alert (XXX) </scr" + "ipt>").
    5. Added via DOM: Var scr=document.createelement ("script"); Scr.src= "Xxx.js";

Several methods of introducing JS in the page

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:
drawing methods of graphics class in java get list of methods in java class web page authentication methods of authentication methods methods of string class methods of thread class types of casting methods

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