How to write javascript in jsp page

With the development of the Internet, dynamic web page technology has become more and more mature, and JSP technology has become more and more popular among developers. In JSP pages, JavaScript is widely and deeply used to achieve dynamic interactive effects, adding more interaction and vividness to the website. Let's introduce how to write JavaScript in JSP pages.

1. What is JavaScript

JavaScript is an interpreted scripting language that can be used for web front-end development and server-side programming. JavaScript can be connected with HTML, CSS and other languages ​​to enhance the dynamic effect of web pages. In JSP pages, JavaScript can implement functions such as form verification, pop-up dialog boxes, and dynamically changing web page content. Therefore, learning JavaScript well is very necessary for JSP front-end developers.

2. How to add JavaScript to the JSP page

1. You can directly add the <script> tag to the JSP page and write the JavaScript code into it. For example: </p> <p><script><br> alert("Hello World!");<br> </script>

2. Refer externally in JSP page JavaScript file. For example:

##3. Calling JavaScript code

JSP JavaScript code can be called in two ways on the page:

1. Call JavaScript code in HTML tags. For example:

2. at< JavaScript code is called in the script> tag. For example:
   <script><p> function showMessage(){<br></p> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"> alert(&quot;Hello World!&quot;);</pre><div class="contentsignin">Copy after login</div></div>}<p> </script>
   
   

4. How to write effective JavaScript

Code modularization: When writing JavaScript, you must follow The principle of modularity divides the code into modules, and each module should be as independent as possible to facilitate maintenance and modification. In JSP pages, code modularization can be achieved by defining different functions and methods.
1. Minimize code size as much as possible: JavaScript code consumes network resources and user bandwidth during transmission. Therefore, when writing JavaScript, try to reduce the size of the code as much as possible, such as compressing the JavaScript code.
2. Code readability: The readability of JavaScript code is very important for maintenance and modification by other people in the project. Therefore, when writing JavaScript code, consider the readability of the code, such as code indentation and comments.

5. JavaScript debugging

In the JSP page, the JavaScript code can be debugged using the browser console. The console can provide a variety of debugging information, such as variable values ​​when the code is running, code execution paths, etc. The debugging tools in the console can help developers locate errors and quickly debug JavaScript code.

6. Precautions

When the <script> tag contains a large amount of JavaScript code, it may slow down the loading of the page. Therefore, it is recommended to write JavaScript code in an external JavaScript file and use <script src="example.js"></script> for reference.
1. When using JavaScript frameworks, you should understand how to use the framework to make the code more concise and easier to maintain.
2. When writing JavaScript code, you should pay attention to the compatibility of the code to ensure that the code can run normally in different browsers.

Summary:

Writing JavaScript in JSP pages can not only increase the interactivity of the web page, but also make the website more vivid. When writing JavaScript code, you need to pay attention to modularity, code size, and readability to make the code easier to maintain. At the same time, during the debugging process, mastering debugging tools can quickly locate errors. I hope this article will be helpful to readers who want to learn to write JavaScript in JSP pages.

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