Here, the computer would evaluate 2 == 1 - this is false, so we move on to the next statement - our else if, 2 < 1. This is again false, so we move on to the else and execute the code inside of that set of curly brackets: alert('2 is greater than 1'). You can havemulti...
代码语言:javascript 代码运行次数:0 运行 AI代码解释 if(condition)statement; 如果你想让多行代码块受if控制,记得加上大括号: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 if(condition){statement1;statement2;} 不完整的比较操作:在条件检查时,确保使用正确的比较运算符(==,!=,<,>等)。 短路逻辑...
注意:在 Javascript 中没有 elseif (一个单词)关键字。 do-while语句 语法 do statement while (condition); 1. 2. 3. do…while 语句创建一个执行指定语句的循环,直到condition值为 false。在执行statement 后检测condition,所以指定的statement至少执行一次。简而言之 先执行代码部分然后再判断 statement 执行至少...
The if Statement Use theifstatement to specify a block of JavaScript code to be executed if a condition is true. Syntax if(condition) { //block of code to be executed if the condition is true } Note thatifis in lowercase letters. Uppercase letters (If or IF) will generate a JavaScript...
(如果condition是truhy[这是js定义的一种状态]的,那么statement1会被执行,否则其他statemen会被执行) 示例代码如下: if(condition) statement1 [elsestatement2] 而关于truthy和falsy的定义在这个逻辑运算符的介绍页面(原文点这)。 If a value can be converted totrue, the value is so-calledtruthy. If a va...
If you want to negate a if statement, we can do so using the NOT operator which reverses the Boolean value, and so changes it from true to false or from false to true.ReferencesLogical NOT (!) - JavaScript | MDN (mozilla.org) How to negate code in "if" statement block in ...
If condition is true, the code inside if is executed. And, the code inside else is skipped. If condition is false, the code inside if is skipped. Instead, the code inside else is executed.Working of the if...else statement Example 2: JavaScript if…else Statement...
Using NOT in the if statement JavaScript also has another logical operator which can be used in the if statement. So far we have tested a condition to see if it is true. But JavaScript has a really simple way of toggling between true and false. By adding an ! to any condition you cha...
if 语句是基本的控制语句,它使JavaScript可以有条件地进行决策和执行语句。 基本if语句的语法如下: if(expression){Statement(s)to be executedifexpressionistrue} 在这里判断一个JavaScript表达式。如果输出值为true,则执行给定的语句。如果表达式为false,则不执行任何语句。
Javascript Programming: If Else + Switch Statement, 视频播放量 4、弹幕量 0、点赞数 0、投硬币枚数 0、收藏人数 0、转发人数 0, 视频作者 张伊不会写代码, 作者简介 ,相关视频:Javascript Programming: Variables,Facilitation Skills - Explain Every Exercise With