在JavaScript中,Switch Case语句能否使用正则表达式? JavaScript的Switch Case语句支持正则表达式匹配吗? 正则表达式是一种用于匹配字符串的模式,可以用于搜索、替换等操作。在JavaScript中,可以使用RegExp对象来创建正则表达式。 在JavaScript中,可以使用正则表达式作为switch case的条件,以下是一个示例代码: ...
JavaScript switch case语句在我们之前的文章中,我们已经学习了如何在JavaScript中使用if-else语句进行决策。我们已经看到,我们可以使用if-else语句基于特定条件执行某些任务,如果条件为真,执行任务A,如果条件为假,执行任务B。在JavaScript中,switch case语句也用于决策目的。在某些情况下,使用switch case语句比if-else语句...
Example 1: Simple Program Using switch...case Suppose we want to display a message based on the current day of the week. Let's look at the example below to see how we can achieve this usingswitch...case. letday =3;letactivity;switch(day) {case1:console.log("Sunday");break;case2:...
Switch case and if-else offer two different approaches to writing conditional statements in JavaScript. Here’s how to determine which one to use.
case 12: dayName = 'December'; break; default: monthName = 'Invalid month'; } console.log(monthName); When you run the above-written code, you will get the output as shown below: > March This is all about the Switch case in JavaScript. ...
JavaScript Switch Case Default Thedefaultstatement is executed if the switch expression output does not match with any of the given cases. In the below example we have shown this scenario: With this, we have covered the JavaScript switch statement. Althoughifelsestatements are popular and used in...
确保你不会忘记break块末尾的语句,如果你不放一个break结尾的声明case块,JavaScript 将失败到下一个case. consthero='Batman';letsidekick;switch(hero){case'Batman':sidekick='Robin';// Unless there's a `break`, JavaScript will execute the next// `case` block.// break;case'Aquaman':sidekick='Aqu...
The basic JavaScript switch syntax: switch(expression){ case value: expression; break; case value: expression; break; default: Expression;} Following the logic of the example syntax, this sequence of events take place. The expression is evaluated ...
Example #3 When there is a missing break keyword in Case statements Code: public class VowelClass{ public static void main(String args[]) { char ch = 'a'; switch (ch) { case 'e': System.out.println("Value matched - e, a vowel\n"); break; ...
In the above example, switch statement includes an expression a/3, which will return 1 (because a = 3). So, case 1 will be executed in the above example. The switch can also contain string type expression.Example: switch with String Type Case Copy var str = "bill"; switch (str) {...