var list = [];

var interval = null;

​

var reTryInteval = () => setInterval(reTry, 3000);

​

​

var reTry = () => {

  console.log('You are going to running retry');

  console.log(list);

  if (!list.length) {

    console.log('@@@There is no thing to retry, exit retry!!!');

    clearInterval(interval);

  }

}

​

var addItemFn = () => {

  var item = new Date().getTime();

  console.log('You are going to add this item : ' + item);

  list.push(item);

  if (interval) {

    clearInterval(interval);

  }

  interval = reTryInteval();

}

​

var showItemsFn = () => {

  console.log(list);

}

​

var removeItemFn = () => {

  list.shift();

}

​

​

​

var targetObj = {};

var targetProxy = new Proxy(targetObj, {

  set: function (target, key, value) {

      console.log(`${key} set to ${value}`);

      target[key] = value;

      return true;

  }

});

​

var setValueFn = () => {

  var value = new Date().getTime();

  targetProxy.hello_world = value; // console: 'hello_world set to test'

}

​

​

​