ap.offPageResume(CALLBACK)

<script src="https://gw.alipayobjects.com/as/g/h5-lib/alipayjsapi/3.1.1/alipayjsapi.inc.min.js"></script>

<button id="J_btn_push" class="btn btn-default">打开新页面</button>
<script>
  var btnPush = document.querySelector('#J_btn_push');
  var handler = function(res){
    ap.alert('欢迎回来', function(){
      ap.showToast('现在重复之前的操作，不会再有 alert 了');
    });
    ap.offPageResume(handler);
  };
  ap.onPageResume(handler);
  btnPush.addEventListener('click', function(){
    ap.pushWindow({
      url: 'onPageResume-demo.html',
      data: {
        for: 'pageResume'
      }
    });
  });
</script>