JavaScript switch statement

switch statement is used to perform different actions based on different conditions.

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JavaScript switch statement

Use the switch statement to select one of multiple blocks of code to execute.

Syntax

switch(n) { case 1: 执行代码块 1 break; case 2: 执行代码块 2 break; default: n 与 case 1 和 case 2 不同时执行的代码 }

Working principle: First set the expression n (usually a variable). The value of the expression is then compared to the value of each case in the structure. If there is a match, the code block associated with the case is executed. Please use break to prevent the code from automatically running to the next case.

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Example

Displays today’s week name. Please note that Sunday=0, Monday=1, Tuesday=2, etc.:

     
  
点击下面的按钮来显示今天是周几：
 点击这里 
   

Run the program and try it

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default Keywords

Please use the default keyword to specify what to do when the match does not exist:

Example

If today If it is not Saturday or Sunday, the default message will be output:

    
  
点击下面的按钮，会显示出基于今日日期的消息：
 点击这里 
   

Run the program and try it