[JavaScript] JavaScript 9. Javascript switch statements

The condition statements in JavaScript are used to complete behaviors based on different conditions.

Instance

Switch statement

How to compile a switch statement.

Javascript switch statement

If you want to execute one of several code blocks, you can use the switch statement:

Syntax:

switch(n){case 1:Execution Code Block 1break   case 2:Execution Code Block 2break   default:If n is neither 1 nor 2, execute this code}

Working Principle: (N) after the switch can be an expression or (and usually) a variable. Then, the value in the expression is compared with the number in case. If it matches a case, the subsequent code is executed.BreakTo prevent the code from being automatically executed to the next line.

Instance:

<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>