创建与服务器同步的 JavaScript 计时器

Question

1 - 我建议您使用规则flex。将其添加到您的 CSS 中：

#message{

  display: flex;

  align-items: center;

  justify-content: center;

}

2 - 从此标签中删除styles属性和样式p：

<p style="margin-bottom:auto;text-align:center;">

...

</p>

3 - 此外，您的span #message标签是display: inline动态的。您需要在javascript或中禁用此功能jquery。或者!important用于：display: flex_#message

#message{

  display: flex!important;

  ...

}

如果您遵循我的回答，那么您的绿色标题的内容会看起来不错。

.ShowHide {

  overflow: hidden;

  background-color: #2a4735;

  color: white;

}

#left-showing {

  overflow: hidden;

}

#right-showing {

  float: right;

  width: 30px;

  text-align: center;

}

.ShowHide a {

   color: white;

   text-decoration: none;

}

.ShowHide a:hover {

   text-decoration:underline;

}

#message{

  display: flex;

  align-items: center;

  justify-content: center;

}

@media screen and (max-width: 425px){

  #message{font-size:10px;}

  .shippingimage{display:none;}

}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<div class="ShowHide" id="Bar">

  <div id="right-showing">

    <a href="#" onclick="Hide(Bar);">X</a>

  </div>

  

  <div id="left-showing">

    <p>

      <span id="message"></span></p>

    

    <script type="text/javascript">

    function nextMsg(index) {

        if (messages.length === index) {

            nextMsg(0);

        } else {

            $('#message').html(messages[index]).fadeIn(1000).delay(2000).fadeOut(1000, ()=> nextMsg(index+1));

        }

    };

    var messages = [

        '<img src="https://i.imgur.com/bcq9ydY.png" width="30px" class="shippingimage"><a href="https://www.fermento24.com/pages/spedizione" style="letter-spacing: -0.5px;vertical-align: super;">Consegna gratuita in giornata a Napoli, Caserta e relative province sopra i 25€</a>',

        '<img src="https://i.imgur.com/pSAQiQp.png" width="35px" class="shippingimage"><a href="https://www.fermento24.com/pages/spedizione" style="vertical-align: super;"> Spedizione gratuita nel resto d’Italia sopra i 120€</a>',

    ];

    $('#message').hide();

    nextMsg(0);

    </script>

</div>

</div>

Answer 1

实际上，我认为你指的是方法setInterval。我相信你应该使用一个初始值为1的计数器。每次调用interval方法后，计数器应该增加1，然后你可以检查计数器是否超过了值60，然后才进行ajax调用并重新启动everythink 。它应该看起来像这样var counter = 1;var timer = 0;yourAjaxCall();var t = setInterval(function(){&nbsp; &nbsp; //do client side stuff with time&nbsp; &nbsp; //after you done check if time needs to be fetched from server {60 seconds passed}&nbsp; &nbsp; counter++;&nbsp; &nbsp; if(counter >= 60){&nbsp; &nbsp; &nbsp; &nbsp; counter = 1;&nbsp; &nbsp; &nbsp; &nbsp; yourAjaxCall();&nbsp; &nbsp; }}, 1000);function yourAjaxCall(){&nbsp; &nbsp; $.ajax({&nbsp; &nbsp; &nbsp; &nbsp; url: 'yoururl',&nbsp; &nbsp; &nbsp; &nbsp; type: 'post',&nbsp; &nbsp; &nbsp; &nbsp; success: function(response){&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; timer = response;&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; });}