add utils

src/utils/postMessage.ts

@@ -0,0 +1,23 @@
+class PostMessage {
+    #iFrame: HTMLIFrameElement|null =null;
+    #targetOrigin: string = '';
+    constructor(el:HTMLIFrameElement, targetOrigin: string) {
+        this.#iFrame = el;
+        this.#targetOrigin = targetOrigin;
+        window.addEventListener('message',this.handle,false)  
+    }
+    sendMessage(message: any) {
+        this.#iFrame!.contentWindow!.postMessage(message,this.#targetOrigin);
+    }
+    private handle(e: MessageEvent) {
+        if(e.origin===this.#targetOrigin){
+            console.log(e.origin) //父页面URL，这里是http://a.index.com
+            console.log(e.source) // 父页面window对象，全等于window.parent/window.top
+            console.log(e.data)  //父页面发送的消息
+        }
+    }
+    destroy() {
+        window.removeEventListener('message',this.handle,false)  
+    }
+}
+export default PostMessage;