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...
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: ArraySome 内容 every every() 方法测试一个数组内的所有...
在编程中,else 语句通常与 if 语句一起使用,以处理不满足任何 if 条件的情况。当有多个 if 语句时,可以使用 else if 来链式判断,或者将多个 if 语句放在一个 if-else 结构中。以下是两种常见的用法: 1. 使用 else if 链式判断 代码语言:txt 复制...
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...
JavaScript Author:Olorunfemi Akinlua Reviewer:Deepak Prasad Introduction There are different ways to phrase conditional logic. If we have a certain condition, let’s do this, else, let’s do that. This is the typical logic that guides conditional logic, and basically theif/elsestatement. However...
The number is less than 50.The number is less than 50.The number is in the range of 20 to 100.The number is in the range of 20 to 100.The number is less than 50.The number is in the range of 20 to 100. 在這裡,我們新增了if和各種else if語句,每個語句都包含多個條件。現在,根據陣...
if(number>0){// Positive}else{// Negative} versus if(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 usingMath.sign. But whereMath.signshines is it returns a number value. ...
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...
consta=null;if(a==null){// 👇️ this runsconsole.log('a is null or undefined');}else{console.log('a is not null and undefined');}if(a!=null){console.log('a is not null and undefined');} The code for this article is available onGitHub ...
MDN: Primitive is data type that is not an object and has no methods. All primitives are immutable (ie. they can't be altered). They are stored by value In JavaScript, there are 6 data types that are primitives. string number