In web development, jQuery is often used. It is a fast and concise JavaScript library. Sometimes we need to display different pictures on the page, such as displaying a different picture when the mouse is hovering. At this time, we can use jQuery to dynamically change the image path to give the page a richer effect.
The implementation method of dynamically changing the image path in jQuery is very simple. Let’s share the specific operation below.
The first step is to write the image code in the HTML document:
<img src="img/default.jpg" alt="默認(rèn)圖片" id="myImg">
This is the most basic image tag, where the src attribute is the path to the image and the alt attribute is the image description, the id attribute is set for the convenience of subsequent operations.
In the second step, we need to obtain the object of the image tag in the jQuery script:
var?myImg?=?$("#myImg");
The selector in jQuery is used here, and the corresponding image tag in the page is found through the id attribute. And name it myImg.
The third step, we can use the .attr() method to change the path of the image:
myImg.attr("src",?"img/hover.jpg");
We pass in two parameters, the first parameter is the attribute name to be changed, here It is the src attribute. The second parameter is the value to be changed. Here is the new path of the image. The meaning of this code is to change the original image path "img/default.jpg" to "img/hover.jpg".
The fourth step, we can call this code in the mouse hover event to achieve the effect of changing the image when the mouse is hovered:
myImg.hover(
??function()?{
????myImg.attr("src",?"img/hover.jpg");
??},
??function()?{
????myImg.attr("src",?"img/default.jpg");
??}
);
The .hover() method is used here, which can Help us register mouse hover and move out events, and call the corresponding functions respectively. The first parameter is the function to be executed when the mouse is hovered, here is to change the image path to "img/hover.jpg"; the second parameter is the function to be executed when the mouse is moved out, here is to change the image path back to the original "img/default.jpg".
Now, we have successfully achieved the effect of dynamically changing the image path. This method is very useful in actual development and can help us quickly achieve some interesting effects and improve the interactivity of the page.
In short, when using jQuery, we can use the many methods and techniques it provides to solve the practical problems we face in page development and achieve twice the result with half the effort.
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