假设你只需要在a > 10时执行doThis（）函数：因此，正如你所看到的，将if-else放在箭头函数中并没有...
let isWeekend = true; let isHoliday = false; if (isWeekend || isHoliday) { console.log("休息日"); } else { console.log("工作日"); } 在这个例子中,只要isWeekend或isHoliday中有一个为真,就会输出“休息日”。 使用逻辑非(!) 代码语言:txt 复制 let isLoggedIn = false; if (!isLoggedI...
R语言ifelse语句能否与dplyr包一起使用来筛选满足条件的列? JavaScript——快速判断数组对象的值是否全部满足条件 前言EasyBe主题开发中遇到一个问题,查看了下MDN文档找到了比较合适的方法,这里只做了简单的示例,详细的一些描述和原理建议访问MDN进行查看; every: every ArrayEvery:...ArrayEvery some: some ArraySome...
1.if else if(条件表达式1){ //执行语句 }else if(条件表达式2){ //执行语句 }else{ //执行语句 } 1. 2. 3. 4. 5. 6. 7. 2.三目运算符 表达式?表达式1:表达式2表达式为真返回表达式1,假返回表达式2 3.switch语句 switch(表达式){ case value1: //执行语句 break; case value2: //执行语句...
function is<T extends object>(v: any, k: string): v is T { return k in v;}interface A{ a:string}interface B{ b: string}interface C{ c: string }type ObjectType = A|B|Cfunction fun(test: ObjectType) { if (is<A>(test, 'a')) { console.log(test.a) } else if (is<B>...
This is the typical logic that guides conditional logic, and basically the if/else statement. However, we can always expand the way we work around the if/else statement with other Boolean operators such as not, and, etc.To negate code in JavaScript, we can make use of the JavaScript ...
In this example, the function returns true if the string contains any white space in it else it returns false Conclusion: So to detect any white space in a given string in Javascript we can use the regex test() method or the stringindexOf() method. Related Topics: How to check if Stri...
if (number > 0) { // Positive } else { // Negative } versusif (Math.sign(number) > 0) { // Positive } else { // Negative } Indeed, if you're just checking the boolean status, then I'd just use the comparative operator instead of using Math.sign. But where Math.sign ...
log('The number is in the range of 20 to 100.'); } else if (num != 20 && num % 2 == 0) { console.log('The number 20 is divisible by 2.') } else if ((num < 50) || (num == 5)) { console.log('The number is less than 50.') } }) 출력: The number is ...
方法1:自定义异常#-*- coding:utf-8 -*- """功能:python跳出循环""" #方法1:自定义异常 classGetoutofloop(Exception):passtry:for i in range(5):for j in range(5):if i == j == 2:raiseGetoutofloop()else:print i, '---', jexceptGe python...