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<>背景介绍
所写的项目是用vue+element搭建的，想要实现一个图片上传的功能，存在阿里云服务器。后台看了阿里云文档，觉得客户端直传是最合适的方案。流程大致为客户端选取文件后向后端索要签名，然后传到阿里云。
<>效果图
<>代码实现
<el-upload :action="addressOss" list-type="picture-card" ref="upload"
:before-upload="upload" :data="dataOss" :on-success="uploadSuccess"
:on-error="uploadError" > <i class="el-icon-plus"></i> </el-upload> <el-dialog
:visible.sync="dialogVisible"> <img width="100%" :src="dialogImageUrl" alt="">
</el-dialog>
就是正常的element组件,主要用到了上传时的几个钩子函数，上传前before-upload，上传成功on-success，上传失败on-success，和上传的地址action，上传额外的参数data。接下来看一下对应得函数。
选择图片后，上传前执行的函数
async upload(file) { let fileName =
"devicesource"+file.uid+file.name;//文件名，和后台约定 let reponse = await
this.$store.dispatch({ type:'device/Sign', data:{ fileName:fileName } })//索要签名
this.addressOss = reponse.data.result.host;//上传地址 this.dataOss = {
key:reponse.data.result.key, ossAccessKeyId:reponse.data.result.ossAccessKeyId,
policy:reponse.data.result.policy, signature:reponse.data.result.signature,
callback:reponse.data.result.callback, };//上传额外参数 }
上传失败和成功后的处理函数
uploadError(err, file, fileList){ this.$message.error('图片上传失败！'); }
uploadSuccess(err, file, fileList){ this.$message.success('图片上传成功！');
this.photos.push(this.addressOss+""+this.dataOss.key) }
上传图片结束。
<>总结
因为后台接口的约束，我这边是一个图片一个图片上传，但是大体思路就是这样了，希望能帮到大家！
