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Javascript scripts can appear in two locations, namely: 1. In the HTML body part, the js at this location will be executed when the page is loaded; 2. In the HTML head part, the js at this location js will be executed when called.
The operating environment of this article: windows7 system, javascript version 1.8.5, Dell G3 computer.
The location of JS script in Html
Where to put JavaScript script?
The JavaScripts in the HTML body part will be loaded when the page is loaded be executed.
JavaScripts in the HTML head section will be executed when called.
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Where should JavaScript be placed
The JavaScripts in the page will be executed immediately when the browser loads the page. We don’t want this to always be the case. Sometimes we want a script to be executed when the page is loaded, and sometimes we want it to be executed when the user Execute the script when an event is triggered.
Scripts in the head section: Scripts that need to be called to be executed or scripts that are triggered by events are placed in the head section of HTML. When you place a script in the head section, you ensure that the script is loaded before any calls are made.
<html> <head> <script type=”text/javascript”> …. </script> </head>
Scripts in the body section: Scripts that are executed when the page is loaded are placed in the body section of the HTML. Scripts placed in the body section are usually used to generate the content of the page.
<html> <head> </head> <body> <script type=”text/javascript”> …. </script> </body>
The body and head parts can have scripts at the same time: You can put countless scripts in the file, so your file can have scripts in both the body and head parts.
<html> <head> <script type=”text/javascript”> …. </script> </head>
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External script Use
Sometimes you may want to run the same script on several pages without having to write the code repeatedly in each page. This is when you need to use external scripts. You can write the script in an external file and save it with a .js extension.
Note: Do not include the tag 3f1c4e4b6b16bbbd69b2ee476dc4f83a in external script files!
When using external scripts, replace the tag 3f1c4e4b6b16bbbd69b2ee476dc4f83a Just point the "src" attribute value to the corresponding .js file:
<html> <head> <script src=”xxx.js”></script> </head> <body> </body> </html>
Recommended study: "javascript Advanced Tutorial"
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