switch 语句是逐行执行的,当 switch 语句找到一个与之匹配的 case 子句时,不仅会执行该子句对应的代码,还会继续向后执行,直至 switch 语句结束。为了防止这种情况产生,需要在每个 case 子句的末尾使用 break 来跳出 switch 语句。 break 除了可以用来跳出 switch 语句外,还可以用来跳出循环语句(for、for in、while、...
switch语句分析一个表达式,将结果与case的值进行比较,然后执行与正确case值对应的语句。语法:switch (expression) { case value1: statement1; break; case value2: statement2; break; . . case valueN: statementN; break; default: statementDefault; } JavaScript Copy...
}console.log("Code after switch statement")// Output: Code after switch statement Run Code We haven't used adefaultcase in the program above. Moreover, the value of thecountryvariable doesn't match any of the cases in theswitchstatement. In such cases, theswitchstatement is skipped entirely...
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...
It is not necessary to break the last case in a switch block. The block breaks (ends) there anyway. Note:If you omit the break statement, the next case will be executed even if the evaluation does not match the case. The default Keyword ...
case valueN: statementsN // 当表达式的结果等于 valueN 时,则执行该代码 break; default : statements // 如果没有与表达式相同的值,则执行该代码 } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. switch 语句根据表达式的值,依次与 case 子句中的值进行比较: ...
The switch statement is used to perform different actions based on different conditions.The JavaScript Switch StatementUse the switch statement to select one of many blocks of code to be executed.Syntaxswitch(expression) { case n: code block break; case n: code block break; default: default ...
The syntax for the switch statement in JavaScript is: switch(expr){casevalue1:// statements to execute when expr matches value1break;casevalue2:// statements to execute when expr matches value2break;casevalue_n:// statements to execute when expr matches value_nbreak;default:// statements to...
The switch case statement may trip up even the most seasoned JavaScript developer. I use this statement often, especially in my nodejs AWS Lambdas, where my business heavy logic resides. Like other curly braced, C based languages, your JavaScript can benefit from a switch statement. ...
There might be an occasion in which you will need to evaluate a range of values in aswitchblock, as opposed to a single value as in our example above. We can do this by setting our expression totrueand doing an operation within eachcasestatement. ...