JS SWITCH语句

语法: 

 

switch(n){case 1:  execute code block 1  break    case 2:  execute code block 2  breakdefault:  code to be executed if n is  different from case 1 and 2} 

 

它是这样工作的:首先，有唯一的一个表达式 n (大多数为一个变量)，它是被赋过值的。 接下来表达式将与每个case(事件)进行比较。如果吻合就执行该事件内的代码块。使用break来防止代码执行后自动转向下一个事件。

 

例子：

<script type="text/javascript">//You will receive a different greeting based//on what day it is. Note that Sunday=0,//Monday=1, Tuesday=2, etc.var d=new Date()theDay=d.getDay()switch (theDay){case 5:  document.write("Finally Friday")  breakcase 6:  document.write("Super Saturday")  breakcase 0:  document.write("Sleepy Sunday")  breakdefault:  document.write("I'm looking forward to this weekend!")}</script>