How to implement JavaScript hover function in HTML

JavaScript hover function means that when the mouse pointer hovers over an element, you can perform specified operations, such as displaying prompt information, changing element styles, etc. This feature is very common in web design and can provide users with a better interactive experience. To implement JavaScript hover functionality in HTML, you can follow the steps below.

Step one: Write HTML code

First, you need to write basic HTML code, including the elements that need to implement the hover function. For example, we can create a simple div element as shown below:

<div>这是一个 div 元素</div>

Step 2: Add JavaScript code

Next, you need to add JavaScript code to implement the hover function. You can place the JavaScript code in the head element of the HTML file, or you can place it in an external .js file and then reference it. For example, the following is a simple JavaScript code:

const myDiv = document.getElementById("myDiv");
myDiv.addEventListener("mouseover", function() {
  myDiv.style.backgroundColor = "red";
});

myDiv.addEventListener("mouseout", function() {
  myDiv.style.backgroundColor = "white";
});

This code first obtains the element with the id "myDiv" through the document.getElementById("myDiv") method. Then, add two event listeners to the element through the addEventListener() method. The first listener is mouseover, which represents an event that is triggered when the mouse pointer hovers over the element. When the event is triggered, we can set the background color of the element to red through the style.backgroundColor method. The second listener is mouseout, which represents the event triggered when the mouse pointer leaves the element. When the event fires, we can reset the background color to white.

The effect of this code is that when the mouse pointer hovers over the div element, its background color turns red, and when the mouse pointer leaves, the background color returns to white.

Step 3: Call the JavaScript code

Finally, you need to connect the JavaScript code to the HTML page to make the hover function take effect. JavaScript code can be called by:

• Place JavaScript code directly within the <script> tag of the HTML page. </script>
• Save the JavaScript code in an external .js file, and then reference the file in the HTML page. For example: <script src="myscript.js"></script>

Among the above two methods, the second method is better because it can Manage JavaScript code separately and avoid cluttering HTML page code.

Summary

The JavaScript hover function can add more interactive experiences to web pages, making it easier for users to interact with the page. To implement the JavaScript hover function, you need to write HTML code first, then add JavaScript code, and finally connect the two. The above is a simple implementation example, which needs to be modified and adjusted according to needs in actual applications.

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