為什么輸出的結果一直是長壽老年人，求大神指教?。?/h1>
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>if...else</title>
<script type="text/JavaScript">
function re(){
var myage =document.getElementById('aa');//趙紅的年齡為99
if(myage<=44)
? {document.getElementById("bb").innerHTML = "青年";}
else if(myage<=59)?
? {document.getElementById("bb").innerHTML = "中年人";}
else if (myage<=89)
? {document.getElementById("bb").innerHTML = "老年人";}
else? ? ?
? {document.getElementById("bb").innerHTML = "長壽老年人";}
}
</script>
</head>
<body>
? ? <div>
? ? <label>請輸入你的年齡：</label>
? ? <input id="aa" type="text" />
? ? <input type="submit" onclick="re()" value="Submit" />
? ? <p id="bb"></p>
? ? </div>
</body>
</html>
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>if...else</title>
<script type="text/JavaScript">
function re(){
var myage =document.getElementById('aa');//趙紅的年齡為99
if(myage<=44)
? {document.getElementById("bb").innerHTML = "青年";}
else if(myage<=59)?
? {document.getElementById("bb").innerHTML = "中年人";}
else if (myage<=89)
? {document.getElementById("bb").innerHTML = "老年人";}
else? ? ?
? {document.getElementById("bb").innerHTML = "長壽老年人";}
}
</script>
</head>
<body>
? ? <div>
? ? <label>請輸入你的年齡：</label>
? ? <input id="aa" type="text" />
? ? <input type="submit" onclick="re()" value="Submit" />
? ? <p id="bb"></p>
? ? </div>
</body>
</html>
2019-10-16
var?myage?=document.getElementById('aa').value;??//趙紅的年齡為99這樣才能獲取到文本輸入框的值。