如何在JavaScript中使用if...else if...else结构? if 语句是使用最频繁的语句之一,switch 语句是与 if 语句紧密相关的一种流控制语句。 1 if 语句 代码语言:javascript 代码运行次数:0 运行 AI代码解释 if(条件){ // 执行语句1 }else{ // 执行语句2 } ...
switch 语句是 JavaScript 的"条件"语句的一部分,用于根据不同的条件执行不同的操作。使用 switch 选择要执行的许多代码块之一。这是长的嵌套 if/else 语句的完美解决方案。switch 语句计算表达式。然后将表达式的值与结构中每个 case 的值进行比较。如果匹配,则执行关联的代码块。
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。")...
代码语言:javascript 代码运行次数:0 运行 AI代码解释 switch (str) { case "test3": case "test4": console.log("test1,test2"); break; default: console.log("default"); break; } 注意,如果我们想使用js的switch并且想实现或的时候,就需要上面的写法了,如果采用||,则不会进入进去。 本文参与 腾讯云...
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) {...
However,beware overlogic abuse in your code. The fact you can do it doesn’t imply that you should. Keep a critical mind over what you’re doing: is it really necessary or is there another simpler way? Can I work on a clearer design to express the logic intent?
This is all about the Switch case in JavaScript. Learn JavaScript By Building Tetris!! Check out our articles on JavaScript onCodedamn. Sharing is caring Did you like whatAgam singh,Aman Ahmed Siddiqui,Aman Chopra,Aman,Amol Shelke,Anas Khan,Anirudh Panda,Ankur Balwada,Anshul Soni,Arif Shaikh,...
JavaScript 还支持另外一种循环模式,即 for...in 循环。这一种类型的循环将对象属性作为参数变量来实现循环。 代码: 123//遍历 对象4varobject = [{name:"张三", age:20}, {name:"李四", age:30}, {name:"王五", age:40}];56//开始遍历7//var --> 一个‘小名’ --> in --> 对象8for(...
JavaScript中简单的if语句和switch语句(逆战班) 1、简单if语句和三元运算符 简单的if语句,指的是没有嵌套的if语句,只是就简单的if...else语句,实际中if语句往往是可以嵌套的。 例:var int = 55; if(int % 2 != 0){ if(int >= 60 && int <= 80 ){...
Switch statement multiple cases in JavaScript (Stack Overflow) Multi-case - single operation This method takes advantage of the fact that if there is no break below a case statement it will continue to execute the next case statement regardless if the case meets the criteria. See the section ...