if(nowTime <0 ){break;}为何导致代码无法运行？

发布于
2016-10-03

<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？

javascript

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