计时的清处写消除
<html><head><script type="text/javascript">var c=0var tfunction timedCount(){document.getElementById('txt').value=cc=c+1t=setTimeout("timedCount()",1000)}function stopCount(){clearTimeout(t)}</script></head><body><form><input type="button" value="开始计时！" ><input type="text" id="txt"><input type="button" value="停止计时！" ></form><p>请点击上面的“开始计时”按钮来启动计时器。输入框会一直进行计时，从 0 开始。点击“停止计时”按钮可以终止计时。</p></body></html>
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