<view class="uploadView">
                <view class="imageView" v-if="!imgShow">
                    <view class="upload_img_view">
                        <image src="../../../../static/img/SquareImg/shop_add.png" mode="" class="upload_img"
                            @click="uploadImg(['camera','album'])">
                        </image>
                    </view>
                    <view class="text">圖片需大于600x450px，不超過3M</view>
                </view>
                <view class="imageView upload_view" v-else>
                    <view class="img_List" v-for="(item,index) in img" :key="index">
                        <image :src="item" mode="aspectFit" class="imgShow" @tap="refundPicPreView(item)"></image>
                        <image src="../../../../static/img/SquareImg/dyn_icon_del@3x.png" mode="" class="delete_icon"
                            @click="delImg(index)"></image>
                    </view>
                    <view class="upload_img_view">
                        <image src="../../../../static/img/SquareImg/shop_add.png" mode="" class="upload_img"
                            @click="uploadImg(['camera','album'])">
                        </image>
                    </view>
                    <view class="text">圖片需大于600x450px，不超過3M</view>
                </view>
            </view>

        data() {
            return {
                imgShow: false, //圖片上傳控制
                img: [],
                image: [], //傳給后臺的圖片集合
            }
        },

            //上傳圖片
            uploadImg(sourceType) {
                const thisSelf = this;
                let oldImgsArr = thisSelf.img; //已上傳的圖片集合
                uni.chooseImage({
                    count: 9, // 默認最多一次選擇9張圖
                    sourceType: sourceType, // 可以指定來源是相冊還是相機，默認二者都有
                    success: res => {
                        console.log('resss', res)
                        // 返回選定照片的本地文件路徑列表，tempFilePath可以作為img標簽的src屬性顯示圖片
                        var tempFilePaths = res.tempFilePaths; //重新上傳圖片的集合
                        var newImgsArr = tempFilePaths.concat(oldImgsArr); //將已上傳的圖片集合與重新上傳的圖片集合拼接起來形成一個新的集合
                        thisSelf.img = newImgsArr; //這里的是展示在視圖上的已上傳圖片的集合（已上傳的+重新上傳的）

                        var newArr = [];
                        var imgStr = '';
                        //支持多圖上傳
                        for (var i = 0; i < tempFilePaths.length; i++) {
                            //顯示消息提示框
                            uni.showLoading({
                                title: '上傳中...'
                            });

                            //上傳圖片
                            //圖片路徑可自行修改
                            uploadImage(tempFilePaths[i], 'picture/',
                                function(res) {
                                    uni.hideLoading();
                                    thisSelf.imgShow = true;
                                    newArr.push(res)
                                },
                                function(res) {
                                    //失敗回調
                                }
                            )
                        }
                        setTimeout(() => {
                            let trueImgs = oldImgsArr.concat(newArr);
                            trueImgs.forEach(img => {
                                return imgStr += img + ',';
                            })
                            thisSelf.image = imgStr.substr(0, imgStr.length - 1); //這里是真實圖片的集合 傳此值給后臺
                        }, 1000)
                    }
                })
            },
            //刪除圖片
            delImg(index) {
                this.img.splice(index, 1);
                if (this.img.length == 0) {
                    this.imgShow = false;
                    this.img = [];
                }
            },
            //圖片預覽
            refundPicPreView(imge) {
                var urls = []
                urls.push(imge)
                uni.previewImage({
                    current: urls[0],
                    urls: urls
                })
            },

const env = require('./config.js'); //配置文件，在這文件里配置你的OSS keyId和KeySecret,timeout:87600;

const base64 = require('./base64.js');//Base64,hmac,sha1,crypto相關算法
require('./hmac.js');
require('./sha1.js');
const Crypto = require('./crypto.js');

/*
 *上傳文件到阿里云oss
 *@param - filePath :圖片的本地資源路徑
 *@param - dir:表示要傳到哪個目錄下
 *@param - successc:成功回調
 *@param - failc:失敗回調
 */ 
const uploadFile = function (filePath, dir, successc, failc) {
  if (!filePath || filePath.length < 9) {
    uni.showModal({
      title: '圖片錯誤',
      content: '請重試',
      showCancel: false,
    })
    return;
  }
  
  //圖片名字 可以自行定義，     這里是采用當前的時間戳 + 150內的隨機數來給圖片命名的
  const aliyunFileKey = dir + new Date().getTime() + Math.floor(Math.random() * 150) + '.png';
  
  const aliyunServerURL = env.uploadImageUrl;//OSS地址，需要https
  const accessid = env.OSSAccessKeyId;
  const policyBase64 = getPolicyBase64();
  const signature = getSignature(policyBase64);//獲取簽名
 
  uni.uploadFile({
    url: aliyunServerURL,//開發者服務器 url
    filePath: filePath,//要上傳文件資源的路徑
    name: 'file',//必須填file
    formData: {
      'key': aliyunFileKey,
      'policy': policyBase64,
      'OSSAccessKeyId': accessid,
      'signature': signature,
      'success_action_status': '200',
    },
    success: function (res) {
            console.log(res);
      if (res.statusCode != 200) {
        failc(new Error('上傳錯誤:' + JSON.stringify(res)))
        return;
      }
       successc(aliyunServerURL+aliyunFileKey);
    },
    fail: function (err) {
      err.wxaddinfo = aliyunServerURL;
      failc(err);
    },
  })
}

const getPolicyBase64 = function () {
  let date = new Date();
  date.setHours(date.getHours() + env.timeout);
  let srcT = date.toISOString();
  const policyText = {
    "expiration": srcT, //設置該Policy的失效時間，超過這個失效時間之后，就沒有辦法通過這個policy上傳文件了 
    "conditions": [
      ["content-length-range", 0, 5 * 1024 * 1024] // 設置上傳文件的大小限制,5mb
    ]
  };

  const policyBase64 = base64.encode(JSON.stringify(policyText));
    console.log(policyBase64);
  return policyBase64;
}

const getSignature = function (policyBase64) {
  const accesskey = env.AccessKeySecret;

  const bytes = Crypto.HMAC(Crypto.SHA1, policyBase64, accesskey, {
    asBytes: true
  });
  const signature = Crypto.util.bytesToBase64(bytes);
console.log(signature);
  return signature;
}

module.exports = uploadFile;