<!DOCTYPE HTML><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>计时器</title></head><script type="text/javascript"> var num=0; function startCount() { document.getElementById('count').value=num; num=num+1; setTimeout(startCount,1000); } document.write(num);</script></head><body><form><input type="text" id="count" onclick=startCount()/></form></body></html>比如这个例子
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