假設您想要在今天早上9點執行代碼,現在是早上8點,您可以創建超時以匹配目標時間的分鐘數,然後創建1小時的間隔,並在每次執行時檢查時間早上九點,如果是,執行。
在這個小規模的例子
,我執行executeMe()
當時鍾劃分爲9秒時:
現場測試:http://jsbin.com/ikulok/4/edit
<body>
Last run: <span id="time"></span><br>
Next execution: <span id="target"></span>
<script type="text/javascript">
function executeMe(){
alert("9 seconds!");
}
var timeout = null;
var interval = null;
function timer(){
var now = new Date();
document.getElementById('time').innerHTML = now;
document.getElementById('target').innerHTML = new Date(now.getTime()+ 1000);
//console.log("timer()", now);
if(now.getSeconds() == 9)
setTimeout("executeMe();",1); // async
if(interval == null)
interval = setInterval("timer()",1000);
}
var now = new Date();
var target = new Date(now.getFullYear(),now.getMonth(),now.getDate(),now.getHours(),now.getMinutes(),now.getSeconds()+1,0);
//console.log("now", now);
//console.log("target", target);
//console.log("diff", target.getTime() - now.getTime());
document.getElementById('target').innerHTML = target;
timeout = setTimeout("timer()", target.getTime() - now.getTime());
</script>
如果你想運行timer()
每小時而不是每秒,只需調整target
和setInterval()
,當然你的條件
現場測試:http://jsbin.com/ikulok/3/edit
<body>
Last run: <span id="time"></span><br>
Next execution: <span id="target"></span>
<script type="text/javascript">
function executeMe(){
alert("1:20am!");
}
var timeout = null;
var interval = null;
function timer(){
var now = new Date();
document.getElementById('time').innerHTML = now;
document.getElementById('target').innerHTML = new Date(now.getTime()+ 1*60*60*1000);
//console.log("timer()", now);
if(now.getHour() == 1)
setTimeout("executeMe();", 20*60*1000); // !!!! this will execute at 1:20am
if(interval == null)
interval = setInterval("timer()",1*60*60*1000); // !!!! repeat every hour
}
var now = new Date();
// !!!! targeting next exact hour
var target = new Date(now.getFullYear(),now.getMonth(),now.getDate(),now.getHours(),now.getMinutes()+1,0,0);
//console.log("now", now);
//console.log("target", target);
//console.log("diff", target.getTime() - now.getTime());
document.getElementById('target').innerHTML = target;
timeout = setTimeout("timer()", target.getTime() - now.getTime());
</script>
</body>
如果你每天都在檢查,你爲什麼要使用7小時超時? –
更少發郵件? –
@ŠimeVidas從一天開始的7個小時。 – knownasilya