动态创建webview后怎么监听从vue 页面的postMessage消息

let curwebview = this.$mp.page.$getAppWebview();
var params = {
preload:{
data:"jalon8888",
timestamp: new Date().getTime(),
}
}

            this.webview = plus.webview.create("", '__uniapp__service_browser',{top:'100px',bottom:'100px'},params);  
            curwebview.append(this.webview);  
             this.webview.addEventListener("postMessage",function(e){    

        console.log(e);    
    },true);    

这样写监听不起效果