Use uniapp to implement image compression function
Nov 21, 2023 pm 06:36 PM
Use uniapp to realize image compression function
With the improvement of mobile phone camera functions, we often take a large number of photos in our daily life. However, these high-resolution photos take up storage space on your phone, making it slow and easy to fill up.
In order to solve this problem, we can use the relevant technology in uniapp to implement the image compression function, compress the image to a smaller file size, and retain appropriate pixels and image quality. Below we will introduce in detail how to implement the image compression function in uniapp.
Step 1: Introduce relevant plug-ins
First, we need to introduce relevant plug-ins into the uniapp project. The most commonly used image compression plug-in is uni-image-compress, which performs image compression operations based on the two libraries imagemin and tinify. In the uniapp project, we can install it through the npm command:
npm install uni-image-compress
After the installation is completed, introduce the plug-in into the page where the image compression function needs to be used:
import uniImageCompress from 'uni-image-compress'
Step 2: Implement the image Compression function
Next, we can call the uniImageCompress.compressImage() method to compress the image wherever we need to compress the image. This method accepts two parameters: the path of the source image and the path of the compressed image.
For example, we can compress the image selected by the user in a click event:
async compressImage() {
let [err, res] = await uni.chooseImage({
count: 1, // 選擇1張圖片
sourceType: ['album', 'camera'] // 從相冊(cè)或者拍照
})
if (!err) {
let tempFilePath = res.tempFilePaths[0]
let compressedFilePath = 'compressed.jpg' // 壓縮后的圖片路徑
let options = {
width: 800, // 壓縮后的圖片寬度
height: 600, // 壓縮后的圖片高度
quality: 0.8 // 壓縮質(zhì)量，范圍0-1
}
let [compressErr, compressRes] = await uniImageCompress.compressImage(tempFilePath, compressedFilePath, options)
if (!compressErr) {
console.log('壓縮成功！')
} else {
console.log('壓縮失?。?, compressErr)
}
} else {
console.log('選擇圖片失敗：', err)
}
}The above code first selects the user's image through uni.chooseImage() and obtains Temporary file path. Then, compress the image through uniImageCompress.compressImage() and set the compressed image width, height and quality.
Finally, we can print the compression results in the console to determine whether the compression is successful.
Summary
Through the above code example, we can use the image compression plug-in uni-image-compress in uniapp to implement a simple image compression function . Of course, this plug-in has more functions that can be explored, such as supporting compressed image formats, adding watermarks, etc.
Using the image compression function can greatly reduce the size of image files, save mobile phone storage space, and improve the loading speed and operating efficiency of applications. I hope this article can help you implement image compression function in uniapp.
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