How to prevent jquery from being displayed on the page

JQuery is a commonly used front-end JavaScript library that can help developers easily achieve various interactive effects and animation effects. However, sometimes during the development process, the JQuery code cannot be displayed normally on the web page. What should I do at this time? This article will introduce several solutions to help you solve the problem of JQuery not being displayed.

Method 1: Check whether the JQuery file is correctly imported

When using JQuery, you must first correctly introduce the relevant JQuery file into the web page. Generally speaking, you can introduce the JQuery file by adding the following code to the html file:

<script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>

If you are using a local JQuery file, you need to introduce the local path:

<script src="jquery.min.js"></script>

Of course, If you are using CDN acceleration, you can also choose other CDN service providers.

If the JQuery file is not imported correctly, you can confirm it by viewing the console in the browser's developer tools. If an error of "JQuery is not defined" or "$ is not defined" is prompted, it means that JQuery has not been introduced correctly.

Method 2: Check whether the JQuery code is correct

Once it is confirmed that the JQuery file has been imported correctly, we also need to check whether there are mis-editing or grammatical errors in the JQuery code written. You can check the console in the developer mode of your browser to see if there are any syntax errors on the current page. Normally, the console will give detailed prompt information when a syntax error occurs, including the location of the error and a specific error description.

If no syntax errors are found, you can also consider adding:

//为了避免JQuery与其他JS库之间可能存在的命名冲突，可以加上如下代码：
jQuery.noConflict();

This code can avoid naming conflicts between JQuery and other JavaScript libraries and ensure that the JQuery code can work normally run. Of course, this is just one solution and may not be suitable for all situations.

Method 3: Check the event relationship between the page and JQuery

Sometimes, the reason why JQuery cannot be displayed may also be related to the event relationship between the page and JQuery. For example, if the JQuery code is placed before the document is loaded, the JQuery code may not execute. In this case, you can place the JQuery code inside the $(document).ready() function to ensure that the JQuery code is executed after the document is loaded.

Code example:

$(document).ready(function(){
   // 在此处写入需要执行的JQuery代码
});

In addition, no matter when and where you write JQuery code, you need to ensure the correctness of the entire JQuery code logic. Only by ensuring the correctness of the code logic can we ensure that the JQuery code can be executed normally and displayed on the browser interface.

Summary

This article introduces several methods to solve the problem that JQuery cannot be displayed, mainly including checking whether the JQuery file is correctly introduced, checking whether the JQuery code is correct, and checking the event relationship between the page and JQuery . When using JQuery, everyone should pay attention to the above points to ensure that the JQuery code is displayed normally on the browser interface. Of course, in addition to these problems, JQuery also has other problems that may cause JQuery to not display properly, so everyone needs to pay more attention.

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