<html><body onload="countTime()"><div id="text"></div><script type="text/javascript"> var start=Date.now(); var c=document.getElementById("text"); function showTime(){ var nowTime=60-Math.floor((Date.now()-start)/1000); if(nowTime <0 ){break;} c.innerHTML="left time is "+ nowTime +" seconds"; } function countTime(){ c.innerHTML="left time is 60 seconds"; setInterval(showTime,1000); }</script></body></html>上面的代码去掉if(nowTime <0 ){break;}，可以运行，为何加上它，无法正常运行？
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