How to change css style with jquery

jQuery is a widely used JavaScript library, usually used to handle the interaction of HTML pages, animation effects and asynchronous transmission of data. These include changing CSS styles, which is one of jQuery's strengths.

Changing CSS styles is one of the necessary steps to achieve dynamic effects. It can change the way text, images and pages are displayed, making the website more visually attractive to users. jQuery's method of changing CSS styles has better compatibility and scalability than traditional JavaScript, making it easier and faster for developers to design websites. This makes jQuery widely used in web development.

1. Change the css style through the class selector

The most basic way to change the CSS style with jQuery is to use the class selector. This method can change multiple elements on the same page. style. The specific implementation is as follows:

// HTML元素
<div class="box">Hello World!</div>

// 更改CSS样式
$(".box").css("color", "red"); // 将box的字体颜色更改为红色

In the above code, we use the class selector ".box" to select a div element in HTML, and then use the .css() method to change the font color to red.

2. Change css style through attribute selector

In addition to class selectors, attribute selectors are also a common selector that can select elements in HTML through attribute names and attribute values. The specific implementation process is as follows:

// HTML元素
<div class="box" title="red">Hello World!</div>

// 更改CSS样式
$("[title='red']").css('color', 'blue'); // 将title属性值为red的字体颜色更改为蓝色

In the above code, we use the attribute selector "[title='red']" to select a div element with a title attribute value of "red", and then change the font color Change to blue.

3. Change the css style through the id selector

Use the id selector to select the only element on the page, and its selector symbol is "#". It is one of the most commonly used selectors and is used to select the only element on the page. The specific implementation process is as follows:

// HTML元素
<div id="box">Hello World!</div>

// 更改CSS样式
$("#box").css("color", "green"); // 将ID为box的元素字体颜色更改为绿色

In the above code, we use the id selector "#box" to select a div element with the id "box", and then change the font color to green.

4. Change the css style by adding a class selector to the class

Using the method of adding a class selector can replace the problem of reduced code readability caused by the use of attribute selectors in Example 2 above. . The specific implementation is as follows:

// HTML元素
<div class="box">Hello World!</div>

// 更改CSS样式
$(".box").addClass("color-blue"); // 将box元素添加class为color-blue

In the above code, we use the .addClass() method to add a class style selector to the HTML element to change the color to blue.

5. Change the css style through the .hover() method

The .hover() method is a method that responds to mouse events. It can define online behavior for page elements. The specific implementation process is as follows:

// HTML元素
<div class="box">Hello World!</div>

// 更改CSS样式
$(".box").hover(function() {
  $(this).css("color", "orange"); // 鼠标移入box元素后，将字体颜色更改为橙色
}, function() {
  $(this).css("color", ""); // 鼠标移出box元素后，将字体颜色变为默认色
});

In the above code, we use the .hover() method to respond to mouse events. When the mouse moves into the box element, its font color changes to orange, and when the mouse moves out of the box element, its font color changes to the default color.

Through the above five methods, we can flexibly use jQuery to change CSS styles to achieve dynamic effects displayed on different pages. These methods are widely used in website design, which can make developers faster and more efficient during the development process and provide users with a better user experience.

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