JS如何实现微信里判断页面是否被分享成功

varshareData = {

  img_url:"",

  img_width: 200,

  img_height: 200,

  link:'',

  desc:'',

  title:'',

  appid: 0

};

document.addEventListener('WeixinJSBridgeReady',functiononBridgeReady() {

  // 发送给好友

  WeixinJSBridge.on('menu:share:appmessage',function(argv){

    shareFriend();

  });

  // 分享到朋友圈

  WeixinJSBridge.on('menu:share:timeline',function(argv){

    shareTimeline();

  });

},false);

functionshareTimeline() {

  WeixinJSBridge.invoke('shareTimeline', shareData,function(res) {

    validateShare(res);

    _report('timeline', res.err_msg);

  });

}

functionshareFriend() {

  WeixinJSBridge.invoke('sendAppMessage', shareData,function(res) {

    validateShare(res);

    _report('send_msg', res.err_msg);

  });

}

functionvalidateShare(res) {

  if(res.err_msg !='send_app_msg:cancel'&& res.err_msg !='share_timeline:cancel') {

  //分享完毕回调

  }