What does jquery's src mean?

jquery’s src refers to the selector or attribute of the DOM element. src is a standard attribute of HTML elements that specifies the URL of an external resource to be loaded. Methods to get and set the src attribute value: 1. Get the src attribute value of the img element through the attr() method, and print it to the console; 2. Set the src attribute value of the img element through the attr() method, and then get the script The src of the element is printed to the console; 3. Set the src attribute value of the script element.

The operating environment of this article: Windows 10 system, jQuery3.7.0 version, Dell G3 computer.

In jQuery, src refers to the selector or attribute of the DOM element. It is used to get or set the src attribute value of an element. The meaning of src and its use in jQuery will be explained in detail below.

The meaning of the src attribute:

src is a standard attribute of the HTML element, used to specify the URL of the external resource to be loaded. Different HTML elements have different src attributes. For example, the src attribute of the img element specifies the URL of the image to be loaded, and the src attribute of the script element specifies the URL of the JavaScript file to be loaded. The src attribute tells the browser where to get the resource.

Usage of src attribute in jQuery:

In jQuery, you can use the attr() method to get or set the attribute value of an element, including the `` attribute. The attr() method has two uses:

a. Get the src attribute value:

javascript       var srcValue = $("img").attr("src");

The above code will get the src attribute value of the first img element and assign it to the srcValue variable. . If there are multiple matching elements, the attr() method only returns the attribute value of the first element.

b. Set the src attribute value:

javascript       $("img").attr("src", "new_image.jpg");

The above code will set the src attribute value of all img elements to "new_image.jpg". Likewise, if there are multiple matching elements, the attr() method will apply the new value to all elements.

Note: The attr() method can also be used for attribute values, not just the src attribute.

Example:

The following is a simple example that demonstrates how to use the attr() method to get and set the src attribute value:

HTML code:

<img src="image.jpg" alt="Image">
<script src="script.js"></script>
jQuery代码：
// 获取img元素的src属性值
var imgSrc = $("img").attr("src");
console.log(imgSrc); // 输出：image.jpg
// 设置img元素的src属性值为new_image.jpg
$("img").attr("src", "new_image.jpg");
// 获取script元素的src属性值
var scriptSrc = $("script").attr("src");
console.log(scriptSrc); // 输出：script.js
// 设置script元素的值为new_script.js
$("script").attr("src", "new_script.js");

In the above code, first obtain the src attribute value of the img element through the attr() method and print it to the console. Then, set the src attribute value of the img element to "new_image" through the attr() method. Then, get the src attribute value of the script element and print it to the console. Finally, set the script element's src attribute value to "new_script.js".

Summary:

In jQuery, src refers to the selector or attribute of the DOM element. It is used to get or set the src attribute value of an element. This can be easily done via the attr() method.

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