Question

我正在尝试使用javascript制作一个倒数计时器，但有两件事我无法改变，这两个数字应该像这样显示“01:00” 但相反它看起来像这个“1：9”，并且显示除了计时器之外的一个框架是“这只适用于下一个”我试图删除它而我失败了。

 <html>
  <head>
 <title>Countdown</title>
 <script type="text/javascript">
 // set minutes
var mins = 20;

// calculate the seconds (don't change this! unless time progresses at a           different speed for you...)
var secs = mins * 60;
function countdown() {
setTimeout('Decrement()',1000);
}
 function Decrement() {
if (document.getElementById) {
    minutes = document.getElementById("minutes");
    seconds = document.getElementById("seconds");
    // if less than a minute remaining
    if (seconds < 59) {
        seconds.value = secs;
    } else {
        minutes.value = getminutes();
        seconds.value = getseconds();
    }
    secs--;
    setTimeout('Decrement()',1000);
}
}
function getminutes() {
// minutes is seconds divided by 60, rounded down
mins = Math.floor(secs / 60);
return mins;
}
function getseconds() {
// take mins remaining (as seconds) away from total seconds remaining
return secs-Math.round(mins *60);
}
</script>
</head>
<body>

<div id="timer">
This is only valid for the next <input id="minutes" type="text"    style="width: 60px; border: none; background-color:none; font-size: 50px; font-weight: bold;"> : <input id="seconds" type="text" style="width: 60px; border:    none; background-color:none; font-size: 50px; font-weight: bold;"> 
</div>
<script>
   countdown();

Answer 1

试试这个

function getminutes() {
    // minutes is seconds divided by 60, rounded down
    mins = Math.floor(secs / 60);
    return ("0" + mins).substr(-2);
}
function getseconds() {
    // take mins remaining (as seconds) away from total seconds remaining
    return ("0" + (secs-Math.round(mins *60))).substr(-2);
}

Answer 2

要填零，只需执行：

var renderedSecs;

renderedSecs = (secs < 10 ? "0" : "") + secs;

// now put renderedSecs into the HTML

不要对secs执行此操作，因为它是number，而renderedSecs是string。

保持计算的实际数字与渲染（作为字符串）不同。

如何在分钟和秒钟内显示2位数并删除计时器旁边的文本？

2 个答案: