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This article mainly explains "what is the use of the migrate of jquery". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "what is the use of the migrate of jquery?"

Jquery migrate is an auxiliary plug-in for application migration, which is used for high-level version compatible with low-level version; this plug-in can solve the problem of incompatibility between old and new code after jquery upgrade, simply write out unsupported functions to support it.

The operating environment of this tutorial: windows10 system, jquery3.2.1 version, Dell G3 computer.

What is jquery migrate?

JQuery Migrate is an application migration assistant plug-in, which is used for high-level version compatible with lower-level version auxiliary plug-ins.

For example, the jQuery version uses 1.x. If you plan to upgrade to 3.x, you can delete 1.x version from the page and replace it with 3.x version. If there is a script error, introduce the jquery-migrate plug-in to be compatible with the lower version. At the same time, it also shows the solution of replacing the low version method with the new version method.

JQuery migrate (transfer, excessive) jquery upgrade after the new and old code incompatibility, this package is to solve this problem. Is to write out the unsupported functions to support them.

There are differences between jQuery versions. For example, version 1.9 no longer supports live (), die (), toggle (), sub (), $. Browser, and so on. To use versions after 1.9 without changing the code of your site, you need to use jQuery migrate (transfer, over)

Example:

Test $(document) .ready (function () {$("button") .click (function () {alert ($("li"). Size ();}); CoffeeMilkSoda; test button

Click the button to pop up "3".

Put

Replace with

Click the button to display a script error in the Chrome browser developer window:

$(.). Size is not a function

Reintroduce it on the page

Click the button to pop up "3" normally.

At the same time, it is prompted that the size method is deprecated and use length instead:

JQuery.fn.size () is deprecated and removed; use the .length property

Change $("li") .size () to $("li") .length, remove jquery-migrate-3.0.1.js, click the button, and pop up "3".

The migration method is complete.

Thank you for your reading, the above is the content of "what is the use of jquery migrate?" after the study of this article, I believe you have a deeper understanding of the use of jquery migrate, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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