代码如下：
<script language="JavaScript"><!-- var enabled = 0; function TOfunc() { TO = window.setTimeout( "TOfunc()", 1000 ); var today = new Date(); document.clock.disp.value = today.toLocaleString();} --></script> <form name="clock"> <input type="text" name="disp" value="" size=20 onFocus="this.blur()"> <br> <input type="radio" name="rad" value="OFF" checked onClick=" if( enabled==1 ) {document.clock.disp.value=''; clearTimeout( TO ); enabled = 0;} "> 关 <input type="radio" name="rad" value="on" onClick=" if( enabled == 0 ) { var TO = setTimeout( 'TOfunc()', 1000 ); enabled = 1; }" > 开 </form>