範例

Timer-CountDown
設定時間

將以下程式拷貝回您的網頁

<script language="JavaScript">

<!-- Hide the script from old browsers --



// Michael P. Scholtis (mpscho@planetx.bloomu.edu)

// All rights reserved. March 15, 1996

// You may use this JavaScript example as you see fit, as long as the

// information within this comment above is included in your script.



var up,down;

var min1,sec1;

var cmin1,csec1,cmin2,csec2;

function Minutes(data) {

for(var i=0;i<data.length;i++) if(data.substring(i,i+1)==":") break;

return(data.substring(0,i)); }

function Seconds(data) {

for(var i=0;i<data.length;i++) if(data.substring(i,i+1)==":") break;

return(data.substring(i+1,data.length)); }

function Display(min,sec) {

var disp;

if(min<=9) disp=" 0";

else disp=" ";

disp+=min+":";

if(sec<=9) disp+="0"+sec;

else disp+=sec;

return(disp); }

function Up() {

cmin1=0;

csec1=0;

min1=0+Minutes(document.sw.beg1.value);

sec1=0+Seconds(document.sw.beg1.value);

UpRepeat(); }

function UpRepeat() {

csec1++;

if(csec1==60) { csec1=0; cmin1++; }

document.sw.disp1.value=Display(cmin1,csec1);

if((cmin1==min1)&&(csec1==sec1)) alert("時間到");

else up=setTimeout("UpRepeat()",1000); }

function Down() {

cmin2=1*Minutes(document.sw.beg2.value);

csec2=0+Seconds(document.sw.beg2.value);

DownRepeat(); }

function DownRepeat() {

csec2--;

if(csec2==-1) { csec2=59; cmin2--; }

document.sw.disp2.value=Display(cmin2,csec2);

if((cmin2==0)&&(csec2==0)) alert("時間到");

else down=setTimeout("DownRepeat()",1000); }



// --End Hiding Here -->

</SCRIPT>
</HEAD>
<BODY BGCOLOR="#FFFFFF">

<form name="sw">


<table border="3" width="100%">

<tr><th colspan="2">Timer-CountDown</th></tr>

<tr align="center"><td>設定時間<br><input type="text" name="beg2" size="7" value="0:10"></td>

<td><input type="button" value="開始" onclick="Down()"></td></tr>

<tr align="center"><td colspan="2"><input type="text" name="disp2" size="9"></td></tr>

</table>

</td></tr></table>

</form>