javascript倒计时无法正常工作
我是javascript新手。我正试图编写一个javascript倒计时函数,但当我将一个php变量传递给javascript倒计时无法正常工作,javascript,php,Javascript,Php,我是javascript新手。我正试图编写一个javascript倒计时函数,但当我将一个php变量传递给“var now=new Date(“”;“”时,该函数不起作用。当我只使用“var now=new Date();” 先谢谢你。这是我的密码 <?php $db = new mysqli("localhost", "root", "", "ajax"); $db -> set_charset("utf8"); $query="SELECT * FROM data WHERE i
“var now=new Date(“”;“
”时,该函数不起作用。当我只使用“var now=new Date();”
先谢谢你。这是我的密码
<?php
$db = new mysqli("localhost", "root", "", "ajax");
$db -> set_charset("utf8");
$query="SELECT * FROM data WHERE id=2";
$data=$db->query($query);
while ($dt=$data->fetch_assoc()) {
$start=$dt['start_time'];
$end=$dt['end_time'];
}
?>
<!DOCTYPE html>
<html>
<head>
<title> Countdown</title>
<style type="text/css">
body {
background: #f6f6f6;
}
.countdownContainer{
position: absolute;;
top: 50%;
left: 50%;
transform : translateX(-50%) translateY(-50%);
text-align: center;
background: #ddd;
border: 1px solid #999;
padding: 10px;
box-shadow: 0 0 5px 3px #ccc;
}
.info {
font-size: 80px;
}
</style>
</head>
<body>
<table class="countdownContainer">
<tr class="info">
<td colspan="4">c Countdown c</td>
</tr>
<tr class="info">
<td id="days">120</td>
<td id="hours">4</td>
<td id="minutes">12</td>
<td id="seconds">22</td>
</tr>
<tr>
<td>Days</td>
<td>Hours</td>
<td>Minutes</td>
<td>Seconds</td>
<td id="start_date"><?php echo $start;?></td>
<td id="php_date_time"></td>
</tr>
</table>
<script type="text/javascript">
function countdown(){
var now = new Date("<?php echo $start;?>");
var eventDate = new Date("<?php echo $end;?>");
// alert(now);
var currentTiime = now.getTime();
var eventTime = eventDate.getTime();
var remTime = eventTime - currentTiime;
var s = Math.floor(remTime / 1000);
var m = Math.floor(s / 60);
var h = Math.floor(m / 60);
var d = Math.floor(h / 24);
h %= 24;
m %= 60;
s %= 60;
h = (h < 10) ? "0" + h : h;
m = (m < 10) ? "0" + m : m;
s = (s < 10) ? "0" + s : s;
document.getElementById("days").textContent = d;
document.getElementById("days").innerText = d;
document.getElementById("hours").textContent = h;
document.getElementById("minutes").textContent = m;
document.getElementById("seconds").textContent = s;
setTimeout(countdown, 1000);
}
countdown();
</script>
倒计时
身体{
背景:#f6f6f6;
}
.倒计时容器{
职位:绝对职位;;
最高:50%;
左:50%;
转化:translateX(-50%)translateY(-50%);
文本对齐:居中;
背景:ddd;
边框:1px实心#999;
填充:10px;
盒影:0 0 5px 3px#ccc;
}
.info{
字号:80px;
}
倒计时
120
4.
12
22
天
小时
会议记录
秒
函数倒计时(){
var now=新日期(“”);
var eventDate=新日期(“”);
//警惕(现在);
var currenttime=now.getTime();
var eventTime=eventDate.getTime();
var remTime=eventTime-currenttime;
var s=数学下限(remTime/1000);
var m=数学楼层(s/60);
var h=数学楼层(m/60);
var d=数学楼层(h/24);
h%=24;
m%=60;
s%=60;
h=(h<10)-“0”+h:h;
m=(m<10)-“0”+m:m;
s=(s<10)?“0”+s:s;
document.getElementById(“天”).textContent=d;
document.getElementById(“天”).innerText=d;
document.getElementById(“小时”).textContent=h;
document.getElementById(“分钟”).textContent=m;
document.getElementById(“秒”).textContent=s;
设置超时(倒计时,1000);
}
倒计时();
您的PHP仅在页面刷新时更新,因此每次调用倒计时函数时,其值都完全相同:
function countdown(){
var now = new Date("<?php echo $start;?>"); <--- this never changes
var eventDate = new Date("<?php echo $end;?>"); <--- this never changes
var currentTiime = now.getTime(); <--- this result is always the same
var eventTime = eventDate.getTime(); <--- so is this one
var remTime = eventTime - currentTiime; < --- obviously this one too
函数倒计时(){
var now=new Date(“”);基本上java脚本是在客户端运行的,php就像您所知道的服务器端一样,因此javascript无法看到php,这就是它不工作的原因,您可以通过将php变量传递到html(输入)来解决此问题,隐藏类型,如下所示,将php变量传递给html标记,现在javascript可以读取它们。@Laith我按照您的建议做了,但现在不是倒计时:).mhm,让我再检查一下这行给了您值吗?