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