<form name="display1">   

    <input type="text" id="box1" name="box1" value="0" size="4" />   

    <input type="button" value="停止计时" onclick="clearTimeout(meter1)" />   

    <input type="button" value="继续计时" onclick="count1() " />   

</form>   

<p></p>  

<form name="display2">   

    <input type="text" id="box2" name="box2" value="0" size="4" />   

    <input type="button" value="停止计时" onclick="clearTimeout(meter2) " />   

    <input type="button" value="继续计时" onclick="count2( ) " />   

</form>

x = 0  

y = 0  

function count1( )  

{　

    x = x+ 1  

    document.getElementById("box1").value= x  

    meter1=setTimeout("count1()", 1000)  

}

function count2( )

{　

    y = y+ 1  

    document.getElementById("box2").value= y  

    meter2=setTimeout("count2()", 1000)  

}  

// 执行函数

count1( )  

count2( )