vue async 同步调用问题

函数入口 (postmassage)

this.$nextTick(() => {
          let _this = this;
          window.onmessage = async function(event) {
            //iframe调用填报页，接收消息
            // console.info(event.data);
            let iframe_url = window.location.search;
            let theRequest = new Object();
            if (iframe_url.indexOf("?") != -1) {
              //获取路径中的mode
              let str = iframe_url.substr(1);
              let strs = str.split("&");
              for (let i = 0; i < strs.length; i++) {
                theRequest[strs[i].split("=")[0]] = unescape(strs[i].split("=")[1]);
              }
            }
            Vue.set(_this.codes, "iframe_code", event.data.code);

异步函数

async checkModifyAuthrizationToken(token) {
      let result;
      await this.axios.post("/formDetail/checkModifyAuthrizationToken", {
        token: token,
        assignee:this.$route.query.assignee,
      }).then(res => {
        let data = res.data;
        //校验通过
        if (data.result_code == "sys-200") {
          this.isAdminModify = true;
          this.handleTools();
          this.showTools = true;
          result = true;
        }else{
          //this.isAdminModify = false;
          this.disabledForm(res.data.error_message);
          if(this.isSteps){
            this.showTools = true;
          }
          result = false;
        }
      });
      return result
    },

函数调用

let result = await _this.checkModifyAuthrizationToken(_this.$route.query.adminKey);
                    if(!result){
                      FormFillInUtils.handlePostMessage({
                        code: 211, //状态码 已提交
                        msg: "表单修改令牌已过期或已失效", //状态消息
                        data: {
                          form_id: _this.formDetail.form_id,
                          form_detail_id: _this.$route.query.detailId,
                          affair_rela_id: _this.$route.query.id
                        }
                      })
                      return
                    }