当前位置:网站首页 > 技术博客 > 正文

JS Switch

null

Examples
例子

Switch statement[开关语句]
How to write a switch statement.
怎样写switch(开关)语句


The JavaScript Switch Statement
JS 开关语句

Syntax
语法

switch(n)
{
case 1:
  execute code block 1
  break    
case 2:
  execute code block 2
  break
default:

  code to be executed if n is
  different from case 1 and 2
}

This is how it works: First we have a single expression n (most often a variable), that is evaluated once. The value of the expression is then compared with the values for each case in the structure. If there is a match, the block of code associated with that case is executed. Use break to prevent the code from running into the next case automatically.
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。

Example
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")
  break
case 6:
  document.write("Super Saturday")
  break
case 0:
  document.write("Sleepy Sunday")
  break
default:
  document.write("I'm looking forward to this weekend!")
}

</script>
 null

版权声明


相关文章:

  • Linux技术03-Netfilter、Iptables、Nftables、Firewalld2024-10-19 08:00:59
  • js switch分支语句与注意事项break2024-10-19 08:00:59
  • Nftables代替iptables2024-10-19 08:00:59
  • js switch 多个选择条件2024-10-19 08:00:59
  • iptables规则生成2024-10-19 08:00:59
  • JS中switch case,多个case对于同一操作的写法2024-10-19 08:00:59
  • js switch语句的使用2024-10-19 08:00:59
  • entos下rtorrent与rutorrent一键安装包2024-10-19 08:00:59
  • Linux 首次引入 nftables2024-10-19 08:00:59
  • 在Ubuntu下rtorrent编译安装笔记2024-10-19 08:00:59