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In order to achieve powerful functions, web pages must use js files. It is these js files that not only enhance the function of the website, but also affect the opening speed of the website. Generally speaking, there are three ways to optimize js.

Put the unimportant js at the bottom of the page.

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You can get JS or files used by html, such as pictures, css, which take up a lot of loading time.

This is a very simple and effective optimization method, put all the unimportant js at the bottom of the page to achieve asynchronous loading, that is, wait for the page to load, and then load these unimportant js, so that it does not affect the speed of the page.

Merge js files

The purpose of merging js is to reduce the number of http requests, the fewer requests from the server, the faster to open, while merging multiple otherwise separate js files requires some skill. Because js is associative, the variables declared in the previous js code may also need to be called in the later js code, if the order is reversed, js calls undefined variables will make an error, so js must be merged in order, from top to bottom, including js files and js code.

Compress js code

It is recommended to use online js compression to complete the compression of js code.

It should be noted that the js code has a greater impact on optimization, because the search engine crawls js code under pressure, and affects the opening speed of the site, so when optimizing the site, we should try to reduce the number and volume of js code, you can use the form of calls to achieve js functions, in addition, important links should not be added in the js.

When optimizing the website, it is found that the opening speed of the website is too slow, so you can check the js code in the source file. if you find that there is too much js code, you can submit it to the technician for code adjustment.

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