遍历发起异步请求，对所有异步结果进行链式封装--Promise.all()
1.遍历结果发起异步
uploadImg(){
this.fileList.forEach(item=>{
let suffix=item.name.substring(item.name.lastIndexOf('.'))
promiseArr.push(fileServeAPI.uploadFile(this.$util.uuid()+suffix, item, 'base', this.userInfo.id).then(res=>{
return res
}))
})
return Promise.all(promiseArr).then(res=>{
this.form.photos=res.join(',')
return '1'
})
}
2.链式调用
this.uploadImg().then(res=>{})
res:['1','1']//为1中return结果