分片上传（结合element-ui的upload组件实现自定义上传）
async uploadFree(content){let data = await this.getOssToken(); //后台返回的OSS秘钥等等let client = new OSS({region: data.region,accessKeyId: data.AccessKeyId,accessKeySecret: data.AccessKeySecret,stsToken: data.SecurityToken,bucket: data.bucketName});try {let result = await client.multipartUpload(content.file.name, content.file, {progress: async function (p) {//这是上传进度条content.onProgress({percent: parseInt(p * 100)+'%', returnValue: true });}});return (content.file['response'] = [result].map(curr =>{//on-change回调的参数return {code: curr.res.status,name: content.file.name,data: curr.res.requestUrls[0].split('?')[0]}})[0]);} catch (e) {console.log(e)if (e.code === 'ConnectionTimeoutError') {content.onError('视频上传超时')throw "视频上传超时!";}else{content.onError('视频上传失败')}}}
官方文档: 传送门
