JS实现websocket长轮询实时消息提示的效果

效果图如下：

参考代码如下：

jsp代码：

<%@ page contenttype="text/html;charset=utf-8" language="java"%>
<div class="page-header navbar navbar-fixed-top">
  <div class="page-header-inner">
    <div class="page-logo">
      <a href="<c:url value=" rel="external nofollow" rel="external nofollow" /"/>"><img
        src="<c:url value="/img/logo.png"/>" style="height: 14px" alt="logo"
        class="logo-default" /></a>
      <div class="menu-toggler sidebar-toggler hide"></div>
    </div>
    <a href="javascript:;" rel="external nofollow" rel="external nofollow" class="menu-toggler responsive-toggler"
      data-toggle="collapse" data-target=".navbar-collapse"></a>
    <div class="top-menu">
      <ul class="nav navbar-nav pull-right">
        <li class="dropdown dropdown-alert"><a href="#" rel="external nofollow" rel="external nofollow" 
          class="dropdown-toggle" data-toggle="dropdown"
          data-hover="dropdown" data-close-others="true"> <span
            class="badge pull-left"></span><label class="hidden-sm">报警</label><i
            class="fa fa-bell"></i>
        </a>
          <ul class="dropdown-menu">
          </ul></li>
        <li class="dropdown dropdown-user"><a href="#" rel="external nofollow" rel="external nofollow" 
          class="dropdown-toggle" data-toggle="dropdown"
          data-hover="dropdown" data-close-others="true"> <span
            class="username username-hide-on-mobile">你好，${sessionscope.username}</span>
            <i class="fa fa-angle-down"></i>
        </a>
          <ul class="dropdown-menu">
            <li><a href="javascript:;" rel="external nofollow" rel="external nofollow" id="updatepass"><i
                class="icon-lock"></i>修改密码</a></li>
            <li><a href="<c:url value=" rel="external nofollow" rel="external nofollow" /logout"/> "><i
                class="icon-key"></i>退出登录</a></li>
          </ul></li>
      </ul>
    </div>
  </div>
</div>
<div class="clearfix"></div>
<script>
  //toastr.sos(num1)
</script>
<script type="text/javascript"
  src="http://cdn.bootcss.com/jquery/3.1.0/jquery.min.js"></script>
<script type="text/javascript"
  src="http://cdn.bootcss.com/sockjs-client/1.1.1/sockjs.js"></script>
<script type="text/javascript">
  function wspath() {
    var pathname = window.document.location.pathname;
    var host = window.location.host;
    var projectname = pathname.substring(0,
        pathname.substr(1).indexof('/') + 1);
    return (host + projectname);
  }
  wspath = wspath();
  var websocket = null;
  if ('websocket' in window) {
    websocket = new websocket("ws://" + wspath + "/websocket/socketserver");
  } else if ('mozwebsocket' in window) {
    websocket = new mozwebsocket("ws://" + wspath
        + "/bison/websocket/socketserver");
  } else {
    websocket = new sockjs("http://" + wspath
        + "/bison/sockjs/socketserver");
  }
  websocket.onmessage = onmessage;
  websocket.onope = onopen;
  websocket.onerror = onerror;
  websocket.onclose = onclose;
  function onopen() {
  }
  function onmessage(evt) {
    var $uncheckedalertmenubtn = $("a.dropdown-toggle", $uncheckedalertmenu);
    var $uncheckedalertbadge = $("span.badge", $uncheckedalertmenubtn);
    var $uncheckedalertmenu = $('li.dropdown-alert');
    var $uncheckedalertlist = $('ul', $uncheckedalertmenu);
    var a = $uncheckedalertbadge.html();
    $uncheckedalertbadge.html(number(a) + 1);
    //判断报警类型 如果是位置偏移，place+1
    if (evt.data == "1") {
      var count;
      var a = $("#number").html();
      if (a == null) {
        count = 1;
        $uncheckedalertlist
            .prepend('<li class="place-alert"><a href="alert?menuid=274" rel="external nofollow" rel="external nofollow" > <font color="red" id="place-alert">'
                + "位置报警(<font id ='number'>"
                + count
                + "</font>)" + '</font></a></li>');
      } else {
        count = number(a) + 1;
        $("#place-alert").html(
            "位置偏移(<font id='number'>" + count + "</font>)");
      }
    }
    if (evt.data == "0") {
      var count;
      var a = $("#snum").html();
      if (a == null) {
        count = 1;
        $uncheckedalertlist
            .prepend('<li class="sos-alert"> <a href="alert?menuid=274" rel="external nofollow" rel="external nofollow" ><font color="red" id="sos-alert">'
                + "sos报警(<font id='snum'>"
                + count
                + ")</font>"
                + '</font></a></li>');
      } else {
        count = number(a) + 1;
        $("#sos-alert").html(
            "sos报警(<font id='snum'>" + count + "</font>)");
      }
    }
  }
  function onerror() {
    websocket.close();
  }
  function onclose() {
  }
  window.close = function() {
    websocket.onclose();
  }
</script>

总结

以上所述是小编给大家介绍的js实现websocket长轮询实时消息提示的效果，希望对大家有所帮助