为什么无法输出

源自：4-8 退出循环break

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<head>

<title>break</title>

var mynum =new Array(70,80,66,90,50,100,89);//定义数组mynum并赋值

var i=0;

while(i<mynum.lenght)

{

if(mynum[i]<60){

document.write("成绩"+mynum[i]+"不及格，不用循环了"+"<br>");

break;

}

document.write("成绩:"+mynum[i]+"及格，继续循环"+"<br>");

i=i+1;

}

</script>

</head>

<body>

</body>

</html>

提问者：桀仔 2016-11-06 02:19