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JS 参考手册
Window setTimeout() 方法
tryjsref_win_settimeout_clock
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<!DOCTYPE html> <html> <body onload="startTime()"> <div id="txt"></div> <script> function startTime() { var today = new Date(); var h = today.getHours(); var m = today.getMinutes(); var s = today.getSeconds(); // add a zero in front of numbers<10 m = checkTime(m); s = checkTime(s); document.getElementById("txt").innerHTML = h + ":" + m + ":" + s; var t = setTimeout(function(){ startTime() }, 500); } function checkTime(i) { if (i < 10) { i = "0" + i; } return i; } </script> </body> </html>