按下取消之后怎样才能不显示要努力了
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>prompt</title>
<script type="text/javascript">
function rec(){
var score; //score变量，用来存储用户输入的成绩值。
score = prompt() ;
if(score>=90)
{
document.write("你很棒!");
}
else if(score>=75)
{
document.write("不错吆!");
}
else if(score>=60)
{
document.write("要加油!");
}
else(score<60)
{
document.write("要努力了!");
else(score!=0&&score=null)
}
}
</script>
</head>
<body>
<input name="button" type="button" onClick="rec()" value="点击我，对成绩做评价!" />
</body>
</html>
