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关于setInterval的用法

2005-03-04 10:21 579 查看

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">

<HTML>

<HEAD>

<TITLE>setInterval Method</TITLE>

<META HTTP-EQUIV="Content-Type" CONTENT="text/html; CHARSET=iso-8859-1">

<META NAME="AUTHOR" CONTENT="InetSDK">

<META NAME="MS.LOCALE" CONTENT="EN-US">

<META NAME="ROBOTS" CONTENT="noindex">

<SCRIPT>

var oInterval="";

function fnStartInterval(){

if(oInterval==""){

  oTimer.innerHTML="Interval Started";

  oInterval=window.setInterval("fnRecycle()",1000);

}

else{

  fnStopInterval();

}

}

function fnStopInterval(){

if(oInterval!=""){

  window.clearInterval(oInterval);

  oInterval="";

  oTimer.innerHTML="Interval Stopped";

}

}

function fnRecycle(){

var oDate=new Date();

var sSwitch="am";

var iHours=oDate.getHours();

if(iHours>12){

  iHours-=12;

  sSwitch="pm";

}

var sMinutes=oDate.getMinutes() + "";

if(sMinutes.length==1){

  sMinutes="0" + sMinutes;

}

var sSeconds=oDate.getSeconds() + "";

if(sSeconds.length==1){

  sSeconds="0" + sSeconds;

}

oTimer.innerHTML=iHours + ":" + sMinutes + ":" + sSeconds + " " + sSwitch;

}

</SCRIPT>



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<BLOCKQUOTE CLASS="body">

<H1>setInterval Method</H1>

<P>The <b>setInterval</b> method invokes a function or line of code every time the specified amount of time passes.

In this sample, a function is called to update the <b>innerHTML</b> property of a <b>SPAN</b> with the current time every 1000 milliseconds, or every second.

Click Start Interval to invoke the <b>setInterval</b> method.

Click Stop Interval to remove the interval with the <b>clearInterval</b> method.

</P>

<SPAN ID=oTimer STYLE="font-size: 16pt; font-weight: bold; font-family: Times; color: #0000FF;">Interval Stopped</SPAN>

<P>

<INPUT TYPE=button VALUE="Start Interval" onclick="fnStartInterval()">

<INPUT TYPE=button VALUE="Stop Interval" onclick="fnStopInterval()">



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© <A CLASS="clsIncCpyRt" HREF="http://www.microsoft.com/isapi/gomscom.asp?TARGET=/info/cpyright.htm" TARGET="_top"> 2002 Microsoft Corporation. All rights reserved. Terms of use</A>.



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