The switch statement of JavaScript

The struct of switch statement is as follows:

switch (expression) {
case value1:
//Statements executed when the result of expression matches value1
[break;]
case value2:
//Statements executed when the result of expression matches value2
[break;]
...
case valueN:
//Statements executed when the result of expression matches valueN
[break;]
default:
//Statements executed when none of the values match the value of the expression
[break;]
}

The function evaluate expression and get value from each case value or expression.When the result of expression matches one of them,Statements following this value executed.

**Attention!

The result of expression uses === to match value!

The result of expression uses === to match value!

The result of expression uses === to match value!

Important things need to repeat three times. :-)

For more information,see ECMA-262, 3rd edition.