window.parent.postMessage(redata);

window.addEventListener('message',function(e){
 var msg=e.data;
 if(msg.type=="message"){
  flashTitle();//标题闪烁
 }
});

var titleTimer,titleNum=0;
var originTitle = document.title;
function flashTitle() {
 titleNum++;
 if (titleNum == 3) {
  titleNum = 1;
 }
 if (titleNum == 1) {
  document.title = '【】' + originTitle;
 }
 if (titleNum == 2) {
  document.title = '【你有一条消息】' + originTitle;
 }
 titleTimer = setTimeout("flashTitle()", 500);
}

window.onfocus = function () {
 clearTimeout(titleTimer);
 document.title = originTitle;
};