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How to introduce JavaScript script file, in view of this problem, this article introduces the corresponding analysis and answer in detail, hoping to help more partners who want to solve this problem to find a more simple and easy way.

In the web page, you can use the script tag, using the src attribute of the tag to introduce the JavaScript script file, syntax "".

The operating environment of this tutorial: windows7 system, javascript1.8.5 version, Dell G3 computer.

JavaScript script files refer to external JavaScript files that contain JavaScript code and have the extension ".js".

To introduce JavaScript script files, you need to use the script tag, and the basic syntax format is as follows:

In the above format, src is an attribute of the script tag that specifies the path to the external script file. We can omit the type attribute, which can be abbreviated to:

It is important to note that when calling an external JavaScript file, the JavaScript script code can be written directly in the external JavaScript file, without the need to write incoming tags.

In actual development, when you need to write a large number of JavaScript code with complex logic, it is recommended to use JavaScript (outer chained) in the form of introducing js script files. Compared with embedded, the advantages of outer chain can be summarized as follows:

1) facilitate later modification and maintenance

Embedded HTML and JavaScript code will be mixed together, without the use of code modification and maintenance, the outer chain will separate the HTML, CSS and JavaScript code, which is conducive to later modification and maintenance.

2) reduce file size and speed up page loading

Embedded will embed all the JavaScript code into the HTML page, which will increase the volume of the HTML file and affect the loading speed of the page itself, while the outer chain can make use of the browser cache to reuse the JavaScript script code that needs to be used many times, which not only reduces the volume of the file, but also speeds up the loading speed of the page. For example, when the same JavaScript file is introduced in multiple pages, after opening the first page, the browser caches the JavaScript file, and the next time you open another page that references the JavaScript file, the browser does not have to reload the JavaScript file.

This is the answer to the question on how to introduce JavaScript script files. I hope the above content can be of some help to you. If you still have a lot of doubts to solve, you can follow the industry information channel to learn more about it.

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