• 关于setInterval的用法


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     <TITLE>setInterval Method</TITLE>
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    <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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    <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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  • 原文地址:https://www.cnblogs.com/xiaotaoliang/p/112676.html
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