JavaScript 计时器暂停 [英] JavaScript Timer Pause
本文介绍了JavaScript 计时器暂停的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
代码如下.您将如何设置按钮以在按下恢复时暂停计时器并恢复?下面的//标记是我放置暂停和恢复标签的地方.谢谢大家的帮助！！
The code is below. How would you set a button to pause the timer and resume when pressing resume? The // marks below are where I'm placing my pause and resume tags. Thank you for all of your help!!
<head>
<script type="text/javascript">
var d1 = new Date();
d1.setHours(1,0,0);
function f(){
var h= d1.getHours();
var m= d1.getMinutes();
var s=d1.getSeconds();
m= (m<10)?"0"+m: m;
s= (s<10)? "0"+s : s;
var el= document.getElementById("inputid");
el.value= h+":"+m+":"+s;
d1.setSeconds(d1.getSeconds()-1);
if( h==0 && m==0 && s==0 ) clearTimeout(t)
var t= setTimeout("f()",1000);
}
</script>
</head>
<body>
<form><input type="text" id="inputid"></form>
<script type="text/javascript">f()</script>
//pause and resume buttons would go here.
</body>
推荐答案
您可以使用 clearTimeout() 将超时从 setTimeout 传递给它，或者在您的case t.
You can stop a timeout with clearTimeout() passing it the return from setTimeout or, in your case t.
另一个指针:不要将字符串传递给setTimeout，而是传递一个函数引用，因此:
Another pointer: dont pass a string to setTimeout, instead pass a function reference, so:
var t = setTimeout(f,1000)
代替
var t = setTimeout("f()",1000);
如果您想知道为什么，请搜索 "eval is evil".
if you're wondering why, search for "eval is evil".
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