How to merge two versions of jquery

As time goes by, jQuery has gradually become an indispensable tool in web development. There are also different versions of jQuery, each version has different features and functions. During development, we may encounter situations where we need to use different versions of jQuery at the same time, so how to merge them? This article will introduce some commonly used methods.

1. Why do you need to merge different versions of jQuery

In projects, you often need to use multiple plug-ins, and these plug-ins sometimes use different versions of jQuery. If these Different versions of jQuery exist in the page at the same time, which may cause some unpredictable errors. For example, it may cause a certain plug-in to not work properly or the page to be abnormal. At this time, we need to merge these different versions of jQuery to avoid these problems.

2. How to merge different versions of jQuery

1. Using $.noConflict()

$.noConflict() method will release $’s control of jQuery. This avoids conflicts between jQuery versions used in different plug-ins. When merging multiple jQuery versions, we can load multiple versions of jQuery into the page and use the $.noConflict() method to convert them into a global variable to avoid conflicts.

For example, we can use the following code to merge jQuery 1.11.1 and jQuery 3.6.0:

<script src="path/to/jquery-1.11.1.js"></script>
<script src="path/to/jquery-3.6.0.js"></script>
<script>
    var $jq1 = $.noConflict(true);
    var $jq2 = $.noConflict(true);
</script>

In the above code, we use two variables $jq1 and $jq2 respectively to Save different versions of jQuery to avoid conflicts between them.

2. Use the jQuery Migrate plug-in

The jQuery Migrate plug-in is a plug-in officially provided by jQuery, which can help us continue to support the compatibility of older plug-ins when using newer jQuery versions. If we want to use a newer jQuery version but also use some older plug-ins, we can load the jQuery Migrate plug-in to ensure the normal operation of these plug-ins.

For example, we can use the following code to merge jQuery 1.11.1 and jQuery 3.6.0:

<script src="path/to/jquery-1.11.1.js"></script>
<script src="path/to/jquery-3.6.0.js"></script>
<script src="path/to/jquery-migrate-3.3.2.js"></script>

In the above code, we load two different versions of jQuery and jQuery Migrate plugins to ensure compatibility between them.

3. Use the jQuery Compat plug-in

The jQuery Compat plug-in is another plug-in officially provided by jQuery, which allows us to use newer jQuery versions on some older browsers. If we need to use a newer version of jQuery in some older browsers, we can load the jQuery Compat plug-in to achieve this function.

For example, we can use the following code to merge jQuery 3.6.0 and jQuery Compat plugin:

<script src="path/to/jquery-3.6.0.js"></script>
<script src="path/to/jquery-compat-3.6.0.js"></script>

In the above code, we load jQuery 3.6.0 and jQuery Compat plugin so that Use newer versions of jQuery in older browsers.

3. Summary

In actual development, we usually encounter situations where we need to use different versions of jQuery at the same time. At this time, we can use the $.noConflict() method, jQuery Migrate plug-in or jQuery Compat plug-in to achieve the function of merging different versions of jQuery. Which method to use depends on the actual situation of the project.

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