Vue+Element-UI 上传图片并压缩，供大家参考，具体内容如下

1.版本

Vue:2.5.2
Element-UI：2.12.0

可实现图片上传前，自动压缩。
Element-UI组件，详情见 官网。

2.template部分

<el-form-item label="照片"> <el-upload accept="image/*" class="avatar-uploader" :action="uploadPath" :show-file-list="false" :on-success="handleAvatarSuccess" :before-upload="beforeAvatarUpload"> <img v-if="imgUrl" :src="imgUrl" class="avatar"> <i v-else class="el-icon-plus avatar-uploader-icon"></i> </el-upload></el-form-item>

3.script部分

data() { return { //压缩质量 imgQuality: 0.5, imageUrl: ''}methods: { handleAvatarSuccess(res, file) { // 服务器返回结果处理 }, dataURItoBlob(dataURI, type) { var binary = atob(dataURI.split(',')[1]); var array = []; for(var i = 0; i < binary.length; i++) { array.push(binary.charCodeAt(i)); } return new Blob([new Uint8Array(array)], {type: type}); }, beforeAvatarUpload(file) { const _this = this return new Promise(resolve => { const reader = new FileReader() const image = new Image() image.onload = (imageEvent) => { const canvas = document.createElement('canvas'); const context = canvas.getContext('2d'); const width = image.width * _this.imgQuality const height = image.height * _this.imgQuality canvas.width = width; canvas.height = height; context.clearRect(0, 0, width, height); context.drawImage(image, 0, 0, width, height); const dataUrl = canvas.toDataURL(file.type); const blobData = _this.dataURItoBlob(dataUrl, file.type); resolve(blobData) } reader.onload = (e => { image.src = e.target.result; }); reader.readAsDataURL(file); }) }}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。