為什么在安卓中生效在IOS中失??？

appId: process.env.APPID, // 必填，公眾號的唯一標(biāo)識
timestamp: timestamp, // 必填，生成簽名的時間戳
nonceStr: nonceStr, // 必填，生成簽名的隨機串nonceStr
signature: createSignature(timestamp, nonceStr), // 必填，簽名
jsApiList: ['getLocation', 'scanQRCode', 'closeWindow'] // 必填，需要使用的JS接口列表

scanQRCodeView() {
      var _this = this;
      //掃描二維碼點擊，調(diào)用掃碼
      weChatReady().then(() => {
        scanQRCode()
          .then(res => {
            console.log(res, "掃碼結(jié)果&&&&&&&&&");
            if (res.data.projectId && res.data.spaceId) {
              console.log("判斷成功");
              let samaoMatch = {
                projectId: res.data.projectId,
                spaceId: res.data.spaceId
              };
              console.log(res.data.projectId, "res.data.projectId");
              console.log(this, "UUUUUUUUUUUUUUUUUUUU");
              console.log(_this, "PPPPPPPPPPPPPPPPPPP");
              _this.$emit("scanMathc", samaoMatch);
            } else {
              Toast("無效二維碼");
              return; //都為空的話，是么都不做
            }
          })
          .catch(err => {
            Toast("掃碼失敗了");
            console.error(err);
          });
      });