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for(初始條件;判斷條件;循環(huán)后條件值更新)
{  if(特殊情況)
  {break;}
  循環(huán)代碼
}

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<html>
<head>
    <script>
        var num;
        for(num=1;num<10;num++){
            if (num==5)
            {
                break;//如果num是5，退出循環(huán)。
            }
            document.write("數值"+num+"<br />");
        }
    </script>
</head>
<body>
</body>
</html>

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QQ截圖20161012134415.png

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||
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>break</title> <script type="text/JavaScript"> var mynum =new Array(70,80,66,90,50,100,89);//定義數組mynum并賦值 var i=0; while(i<mynum.length) { if(mynum[i]<60) { document.write("成績"+mynum[i]+"不及格，不用循環(huán)了"+"<br>"); break; } document.write("成績:"+mynum[i]+"及格，繼續(xù)循環(huán)"+"<br>"); i=i+1; } </script> </head> <body> </body> </html>