原生iframe 父子页面通讯

<iframe id="kiwiIframe" v-if="showPickForm" src="${chrome.runtime.getURL("iframes/notSupport.html")}">

          let kiwiIframe = document.querySelector("#kiwiIframe");
          kiwiIframe.contentWindow.postMessage("support_ok", "*");

    window.addEventListener("message", function () {
      // console.log(event.data);
      switch (event.data) {
        case "support_ok":
                   console.log('????')
          break;
      }
    });

 window.parent.postMessage("support", "*");

          window.addEventListener("message", function (event) {
            // console.log(event);
            switch (event.data) {
              case "support":
               console.log('?????')
                break;
            }
          });