?????? ??? ?
switch ?? ??? ??? ?? ??? ??? ???? ? ?????.
JavaScript ??? ?
??? ?? ???? ??? ?? ?? ?? ? ??? ?????.
Syntax
switch(n)
{
case 1:
執(zhí)行代碼塊 1
break;
case 2:
執(zhí)行代碼塊 2
break;
default:
n 與 case 1 和 case 2 不同時(shí)執(zhí)行的代碼
}?? ??: ?? ??? n(?? ??)? ?????. ?? ?? ???? ?? ??? ? ??? ?? ?????. ???? ??? ??? ?? ??? ??? ?? ??? ?????. ??? ?? ??? ?? ???? ?? ????? break? ??????.
Instance
??? ? ??? ?????. Sunday=0, Monday=1, Tuesday=2 ?? ?????:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>php中文網(wǎng)(php.cn)</title>
</head>
<body>
<p>點(diǎn)擊下面的按鈕來顯示今天是周幾：</p>
<button onclick="myFunction()">點(diǎn)擊這里</button>
<p id="demo"></p>
<script>
function myFunction(){
var x;
var d=new Date().getDay();
switch (d){
case 0:x="今天是星期日";
break;
case 1:x="今天是星期一";
break;
case 2:x="今天是星期二";
break;
case 3:x="今天是星期三";
break;
case 4:x="今天是星期四";
break;
case 5:x="今天是星期五";
break;
case 6:x="今天是星期六";
break;
}
document.getElementById("demo").innerHTML=x;
}
</script>
</body>
</html>????? ???? ??? ???
?? ???
?? ???? ???? ????? ??? ? ??? ??? ?????. ???? ??? ????.
Instance
??? ????? ???? ??? ?? ???? ?????.
<html>
<head>
<meta charset="utf-8">
<title>php中文網(wǎng)(php.cn)</title>
</head>
<body>
<p>點(diǎn)擊下面的按鈕，會顯示出基于今日日期的消息：</p>
<button onclick="myFunction()">點(diǎn)擊這里</button>
<p id="demo"></p>
<script>
function myFunction()
{
var x;
var d=new Date().getDay();
switch (d)
{
case 6:x="今天是星期六";
break;
case 0:x="今天是星期日";
break;
default:
x="期待周末";
}
document.getElementById("demo").innerHTML=x;
}
</script>
</body>
</html>????? ???? ??? ???
