<!DOCTYPE?html>
<html?lang="en">
<head>
????<meta?charset="UTF-8">
????<title>if_else多重判斷</title>
</head>
<body>
<script?type="text/javascript">
????var?score;
???score?=?prompt("請(qǐng)輸入你的成績(jī)");
???if?(score>=60);
????{
????????alert("您的成績(jī)及格了！?。?);
????}
????else?if(score>=80?&&?score<90);
????{
????????alert("你的成績(jī)很優(yōu)秀")
??????}
????else?if(score>=70?&&?score<80);
????{
????????alert("你的成績(jī)良好，請(qǐng)繼續(xù)保持！")
??????}
????else?if(score>=60?&&?score<70);
????{
????????alert("你的成績(jī)及格了?。?)
??????}
????else
????{
????????alert("你的成績(jī)未及格，請(qǐng)努力學(xué)習(xí)?。?！");
????}
?</script>
</body>
</html>
prompt的對(duì)話框沒有彈出
冷食不宜多吃但冰激凌除外
2018-11-20 17:27:00
