What are the different ways to write a switch statement in JavaScript?

The basic syntax of a switch statement in JavaScript is as follows:

switch(expression) {
  case value1:
    // 在expression等于value1时执行的代码块
    break;
  case value2:
    // 在expression等于value2时执行的代码块
    break;
  // 可以有多个case
  default:
    // 当expression不匹配任何case时执行的代码块
}

In a switch statement, the expression is the expression being compared, the value after the case is a possible value, and the corresponding code block is executed when the expression equals the value. The break is used to end the execution of the switch statement, and default is optional, representing the code block that is executed when the expression does not match any case.

Additionally, multiple values can be matched in one case, as shown below:

switch(expression) {
  case value1:
  case value2:
    // 在expression等于value1或value2时执行的代码块
    break;
  default:
    // 当expression不匹配任何case时执行的代码块
}

The above is the basic syntax of a switch statement, where different case and default statements can be combined based on specific needs.