代码语言:javascript 代码运行次数:0 运行 AI代码解释 switch (expression) { case value1: statement break; case value2: statement break; default: statement } 这里的每个 case 相当于:“如果表达式等于后面的值,则执行下面的语句。”break关键字会导致代码执行跳出 switch 语句。如果没有 break,则代码会继续...
switch(expression) { casex: // code block break; casey: // code block break; default: //code block } This is how it works: The switch expression is evaluated once. The value of the expression is compared with the values of each case. ...
我让template<typename K>作为函数代码的前缀,它被用作向量类型的占位符。我的主要问题是if语句中嵌套的switch语句,用于检查向量的类型。即使if语句检查失败,代码仍然会给出这个错误:aswitchexpression of type 'float' is not valid。例如,如果我在main中声明了一个float类型的向量,那么我使用...
js switch(true){caseisSquare(shape):console.log("该形状是一个正方形。");// 失败,因为正方形也是矩形的一种!caseisRectangle(shape):console.log("该形状是一个矩形。");caseisQuadrilateral(shape):console.log("该形状是一个四边形。");break;caseisCircle(shape):console.log("该形状是一个圆形。")...
In addition toif...else, JavaScript has a feature known as aswitchstatement.switchis a type of conditional statement that will evaluate an expression against multiple possible cases and execute one or more blocks of code based on matching cases. Theswitchstatement is closely related to a conditio...
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 code block } This is how it works:The switch expression is evaluated once. The value...
const content = () => Hello React ; return ( { content() } ); } codeSandBox {() => {//do stuff here }} vs { 1+ 2 // any expression} 不同的是,后一个将被立即调用,而前一个将创建一个函数,但不会调用它。
switch (expression) { case label_1: statements_1; [break;] case label_2: statements_2; [break;] ... default: statements_def; [break;] } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 可选的 break 语句与每个 case 语句相关联, 保证在匹配的语句被执行后程序可以跳出 switch 并且继...
Java folks are so fond of switch, and so are JavaScript developers. Let's be honest, we developers are lazy, and for people like me who lacks creativity it's easy to stick with the status quo. switch is convenient: given an expression we can check if it matches with something else in...
如果多个案例与switch语句匹配,则将使用与expression匹配的第一个case。 breakcase匹配时,语句将从switch中中断。如果不存在break语句,那么即使找到匹配项,计算机也会继续通过switch语句。 如果switch中存在return语句,那么您不需要break语句。 JavaScript中的switch语句示例 ...