<!--不使用parseInt()函數-->
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>switch</title>
<script type="text/JavaScript">
function f(){
var myweek=document.getElementById("a").value; //myweek表示星期幾變量
document.write("結果:"+myweek);
document.write("類型:"+typeof(myweek));
switch(myweek)
{
case "1":
case "2":
document.write("學習理念知識");
break;
case "3":
case "4":
document.write("到企業實踐");
break;
case "5":
document.write("總結經驗");
break;
case "6":
case "7":
document.write("周六、日休息和娛樂");
break;
default:
alert("輸入錯誤，不在1~7之間");
}
}
</script>
</head>
<body>
<h3>請輸入工作日</h3>
<input type="text" id="a">
<input type="button" value="提交日期" onclick=f()>
</body>
</html>
<!--使用parseInt()函數-->
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>switch</title>
<script type="text/JavaScript">
function f(){
var myweek=parseInt(document.getElementById("a").value); //myweek表示星期幾變量
document.write("結果:"+myweek);
document.write("類型:"+typeof(myweek));
switch(myweek)
{
case 1:
case 2:
document.write("學習理念知識");
break;
case 3:
case 4:
document.write("到企業實踐");
break;
case 5:
document.write("總結經驗");
break;
case 6:
case 7:
document.write("周六、日休息和娛樂");
break;
default:
alert("輸入錯誤，不在1~7之間");
}
}
</script>
</head>
<body>
<h3>請輸入工作日</h3>
<input type="text" id="a">
<input type="button" value="提交日期" onclick=f()>
</body>
</html>
var myweek=document.getElementById("a").value 此時得到的id為a的text框的值是一個string變量，那么case的判斷條件也該是字符串變量需要加“”！因為應該是text框的輸入之后就是以字符串變量存儲的.
2017/10/21 發現一個可以將字符串轉化成整數的函數parseInt()