第一步：把如下代码加入<body>区域中
<SCRIPT LANGUAGE="JavaScript">
<!-- Begin
var ms = 0;
var state = 0;
function startstop() {
if (state == 0) {
state = 1;
then = new Date();
then.setTime(then.getTime() - ms);
} else {
state = 0;
now = new Date();
ms = now.getTime() - then.getTime();
document.stpw.time.value = ms;
}
}
function swreset() {
state = 0;
ms = 0;
document.stpw.time.value = ms;
}
function display() {
setTimeout("display();", 50);
if (state == 1) {now = new Date();
ms = now.getTime() - then.getTime();
document.stpw.time.value = ms;
}
}
// End -->
</SCRIPT>
<FORM NAME="stpw">
本例的时间可以准确到百分之一秒<br>
计时:
<INPUT TYPE="text" Name="time"><br>
<INPUT TYPE="BUTTON" Name="ssbutton"
VALUE="开始/停止" onClick="startstop()">
<INPUT TYPE="BUTTON" NAME="reset" VALUE="重置"
onClick="swreset()">
</FORM>
第二步：把<body>区域中的内容为
<body bgColor=#fef4d9 onLoad="display()">
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