JS 定时器 (setInterval 和 setTimeout 函数)

setInterval 和 setTimeout 均为在指定时间过后执行指定的表达式

 

iTimerID = window.setTimeout(vCode, iMilliSeconds [, sLanguage])

iTimerID = window.setInterval(vCode, iMilliSeconds [, sLanguage])

 

不同的是setTimeout()是一次性作用,而setInterval()是每隔iMilliSeconds就执行一次vCode

<html>

<head>

<script language="JavaScript">
<!--

function Refresh()
{
 var newDateObj = new Date();
 document.form1.txt_Time.value=newDateObj.toLocaleString();//使用当前区域设置并已被转换为字符串
}

var MyInterval=setInterval("Refresh()",1000);

function Stop()
{
 if(event.srcElement.value=="STOP")
 //if(document.form1.btn_Stop.value=="STOP")
 {
  clearInterval(MyInterval);
  document.form1.btn_Stop.value="START";
 }
 else if(event.srcElement.value=="START")
 //else if(document.form1.btn_Stop.value=="START")
 {
  MyInterval=setInterval("Refresh()",1000);
  document.form1.btn_Stop.value="STOP";
 }
}

function Clear()
{
 if(event.keyCode==8)//退格键
 {
  event.srcElement.value="";
 }
}
//-->
</script>
</head>


<body>

<form name="form1">
当前时间:<input type=text name="txt_Time" size=30 onkeydown="Clear()">
<input type="button" name="btn_Stop" value="STOP" onClick="Stop()">


</form>

</body>

</html>

 

 

<html>

<head>

<script language="JavaScript">
<!--

function Refresh()
{
 Time.innerHTML=new Date().toLocaleString()+' 星期'+'日一二三四五六'.charAt(new Date().getDay());
 setTimeout("Refresh()",1000);
}

var timer=setTimeout("Refresh()",1000);

function Stop()
{
 if(event.srcElement.value=="STOP")
 {
  clearTimeout(timer);
  document.all.btn_Stop.value="START";
 }
 else if(event.srcElement.value=="START")
 {
  timer=setTimeout("Refresh()",1000);
  document.all.btn_Stop.value="STOP";
 }
}
//-->
</script>
</head>


<body>
<div style="background-color:#eeeeee" id="Time"></div>
<input type="button" name="btn_Stop" value="STOP" onClick="Stop()">

<button name='btnTest' onclick="javascript:alert(this.name)">测试</button>
</body>

</html>

 

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