javascript通知检查器脚本未捕获参考错误
[英]javascript notification checker script Uncaught Reference Error
问题描述
我有此通知检查器，但我不知道此js代码有什么问题，我在checkMessage（）上出错：未捕获的参考错误：未定义checkMessage
js代码：
function checkMessage(){
if (window.XMLHttpRequest)
{
xmlhttp=new XMLHttpRequest();
}
else
{
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function() //when the request is submitted...
{
if (xmlhttp.readyState==4 && xmlhttp.status==200 //...and everything is ok...
{
if(xmlhttp.responseText>0){ // if the response text is greater than 0
document.title="("+xmlhttp.responseText+")"+"My Social Network - Welcome";
document.getElementById('checkMsg').innerHTML="<b>" + xmlhttp.responseText+" Notifications</b>";
}
else
document.title="My Social Network - Welcome";
document.getElementById('checkMsg').innerHTML="No notifications";
}
}
xmlhttp.open("GET","checkMessage.php?user_id="+"1",true);
xmlhttp.send();
}
checkmessage.php代码：
<?php
include 'dbm.php'; //database settings from an external file
$user = $_SESSION['user'];
$get_count_messages = mysql_query("SELECT message FROM notifications ");
$row = mysql_num_rows($get_count_messages); // count how many rows the query returned
echo "$row"; //return the value
?>
html代码：
<html>
<head>
<script type="text/javascript" src="notifications.js"></script>
<script type="text/javascript">
setInterval("checkMessage()", 1000);
</script>
</head>
<body>
<div id="checkMsg"></div>
</body>
</html>
2 个解决方案
解决方案1
0 2016-05-09 19:40:57
我认为您的setInterval函数应如下所示：
setInterval(checkMessage, 1000);
因为setInterval需要函数作为参数。
解决方案2
0 已采纳 2016-05-09 20:36:25
这只是一个简单的示例，可以在通知数量之间有所作为
if (xmlhttp.readyState==4 && xmlhttp.status==200 //...and everything is ok...
{
var title = "";
var message;
if(xmlhttp.responseText > 0)
{
title += "(" + xmlhttp.responseText + ")";
if(xmlhttp.responseText > 1)
message = "<b>" + xmlhttp.responseText + " Notifications</b>";
else
message = "<b>" + xmlhttp.responseText + " Notification</b>";
}
else
message = "No notifications";
title += "My Social Network - Welcome";
document.title = title;
document.getElementById('checkMsg').innerHTML= message;
}
未捕获的参考错误javascript
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