How to use jQuery to set up a video-Front-end Q&A-php.cn

How to use jQuery to set up a video

PHPz

Release： 2023-04-06 10:58:40

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jQuery is a popular JavaScript library that provides some powerful methods and functions that can help developers implement various special effects and functions in web pages. Among them, setting video (video) is one of the powerful functions of the jQuery library. This article will explain how to use jQuery to set up a video.

1. Import the jQuery library

First, you need to import the jQuery library into the HTML page. It can be imported through a CDN (content distribution network) or by downloading a local library. The following is a sample code imported through CDN:

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>jQuery设置视频</title>
    <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
</head>
<body>
    <video id="myVideo" width="640" height="360" controls>
        <source src="myvideo.mp4" type="video/mp4">
    </video>
</body>
</html>

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In the above code, we imported the jQuery library through CDN and added a video element with an id of "myVideo" in the video tag, which contains A video in mp4 format.

2. Set the video size

It is very simple to set the video size using jQuery. For example, to set the width of the video to 500px and the height to 300px, you can use the following code:

$(document).ready(function(){
    $("#myVideo").width(500).height(300);
});

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In the above code, we use the document.ready() function to ensure that all elements in the page are Loading completed. Then, the video element with the id "myVideo" is selected through the jQuery selector, and the width and height of the video are set using the width() and height() methods respectively.

3. Control video playback and pause

It is also very easy to use jQuery to control video playback and pause. For example, to automatically play the video after it is loaded, you can use the following code:

$(document).ready(function(){
    $("#myVideo")[0].play();
});

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In the above code, we use the document.ready() function to ensure that all elements in the page have been loaded. Then, the video element with the id "myVideo" is selected through the jQuery selector, and the play() method is used to play the video.

Similarly, to pause the video playback, you can use the following code:

$(document).ready(function(){
    $("#myVideo")[0].pause();
});

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4. Control the video volume

It is also very easy to control the video volume using jQuery. For example, to set the video volume to 50% (i.e. 0.5), you can use the following code:

$(document).ready(function(){
    $("#myVideo")[0].volume = 0.5;
});

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In the above code, we use the document.ready() function to ensure that all elements in the page have been loaded. . Then, the video element with the id "myVideo" is selected through the jQuery selector and its volume is set to 50%.

5. Control the video playback speed

It is also very simple to use jQuery to control the video playback speed. For example, to set the video playback speed to 2x speed, you can use the following code:

$(document).ready(function(){
    $("#myVideo")[0].playbackRate = 2;
    $("#myVideo")[0].play();
});

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6. Summary

This article introduces how to use jQuery to set up a video and control the size, playback, pause, volume and playback speed of the video. jQuery is a very powerful JavaScript library that provides many practical methods and functions that can help developers implement web page special effects and functions more conveniently and quickly.

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