vue2+elementui使用compressorjs压缩上传的图片

 首先是npm install compressorjs

然后新建一个compressorjs.js的文件

import Compressor from "compressorjs";// 默认压缩配置
const DEFAULT_COMPRESS_OPTIONS = {quality: 0.6, // 默认压缩质量 (0-1)maxWidth: 1920, // 最大宽度maxHeight: 1080, // 最大高度convertSize: 5 * 1024 * 1024, // 超过5MB的图片转为WebP
};/*** 压缩图片文件* @param {File} file - 待压缩的图片文件* @param {Object} options - 压缩配置项* @returns {Promise<File>} 压缩后的文件*/
export function compressImage(file, options = {}) {return new Promise((resolve, reject) => {// 合并配置并限制最小压缩质量const mergedOptions = {...DEFAULT_COMPRESS_OPTIONS,...options,quality: Math.max(0.1,options.quality ?? DEFAULT_COMPRESS_OPTIONS.quality),maxWidth: Math.min(options.maxWidth ?? DEFAULT_COMPRESS_OPTIONS.maxWidth,8192),maxHeight: Math.min(options.maxHeight ?? DEFAULT_COMPRESS_OPTIONS.maxHeight,8192),};// 执行压缩new Compressor(file, {...mergedOptions,success(result) {if (!result) {return reject(new Error("Compression result is empty"));}resolve(new File([result], file.name, { type: result.type }));},error(err) {reject(err);},});});
}

具体的使用页面。只用在上传之前before-upload的函数中压缩就可以啦

<el-upload:before-upload="beforeUploadImg"
>
</el-upload>

import { compressImage } from "@/utils/imageCompress";async beforeUploadImg(file) {const fileSize = file.size / 1024 / 1024;let types = ["image/jpeg", "image/jpg", "image/png", "application/pdf"];const isImageOrPDF = types.includes(file.type);if (!isImageOrPDF) {this.$message.error("上传图片只能是 JPG/JPEG/PNG/PDF 格式!");return false;}try {// 压缩图片（仅处理大于5MB的图片）。当前你也可以不加这个限制就是压缩所有上传的图片if (fileSize > 5) {const compressedFile = await compressImage(file, {quality: fileSize > 10 ? 0.7 : 1,axWidth: Infinity, // 不限制宽度maxHeight: Infinity, // 不限制高度});return compressedFile; // 返回压缩后的文件}return file;} catch (err) {if (fileSize > 5) {this.$message({message: "上传图片大小超过限制",type: "warning",});return false;}console.error("压缩失败:", err);return file; // 降级处理：上传原文件}

}