微信小程序本地上传图片到阿里云oss例子

1.js使用

import { useOss } from '../utils/oss'
let ossUrl = await useOss('http://tmp/BOyneTlXF8TL5936e05540a6b0e5c2d4ffe31ccfac84.pngx-oss-process=style)
//http://tmp/BOyneTlXF8TL5936e05540a6b0e5c2d4ffe31ccfac84.pngx-oss-process=style是使用微信api上传后得到地址

2.使用这个地址上传到阿里云(可直接复制到js里后使用import加载到对应wxml里使用)

const baseUrl = 'http地址'
//定义request
function request(options){
  return new Promise((resolve,reject)=>{
    wx.request({
      url: baseUrl + options.url,
      method:options.method || 'get',
      data:options.data || {},
      header:{
        "content-type":options.contenttype
      },
      timeout: '10000',
      success (res) {
        const {code, resCode} = res.data
        if (code === 200 || code === 201 || resCode === '0000') {
          resolve(res)
        }
        if (code === 402) {
          return wx.navigateTo({
            url: '/pages/login/login',
          })
        }
        resolve(res)
      },
      fail (err) {
        console.log(err, 'fail')
        reject(err)
      }
    })
  })
}
export async function useOss(file){
	const res = await getAliyunAccess()
	const {
		resCode,
		resultContent: ossParams
	} = res.data
	if (resCode === '0000') {
		const {dir, accessid, policy, signature, callback, host: url} = ossParams
		const timestamp = new Date().getTime()
		const random = Math.floor(Math.random() * 100000);
		const key = dir +''+ timestamp + "_" + random
		const uploadRes = await uploadFile(key, accessid, policy, signature, callback, 200, url, file)
		const object = JSON.parse(uploadRes.data)
		const { filename } = object.resultContent
		// console.log('这里是oss返回数据',filename)
		return filename
	}
}
//获取阿里云签名
function getAliyunAccess(){
  return request({
    url: '/aliyun/oss/policy',
    method: 'GET',
    contenttype: "application/x-www-form-urlencoded",
  })
}
//上传图片到阿里云
function uploadFile(key, accessid, policy, signature, callback, success_action_status, url, file) {
  return new Promise((resolve, reject) => {
    wx.uploadFile({
      url: url,
      filePath: file,
      method: 'POST',
      header: {
        'content-type': 'application/x-www-form-urlencoded',
      },
      name: 'file',
      formData: {
        'key': key,
        'OSSAccessKeyId': accessid,
        'policy': policy,
        'Signature': signature,
        'callback': callback,
        'success_action_status': success_action_status
      },
      success(res) {
        resolve(res)
      },
      fail(err) {
        reject(err);
      },
    })
  })
}