var x=prompt("請輸入0-100的數字");
if(x>=60)
alert("及格");
else
alert("不及格");
<!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>無標題文件</title>
</head>
<body>
<script>
var x=prompt("請輸入0-100的數字","");
if(x>=90)
alert("優等！");
else if(x<90&&x>=80)
alert("甲等！");
else if(x<80&&x>=70)
...
"你是獵人還是獵物？"
