当condition为真时执行的语句。可为任意语句,包括更深层的内部if语句。要执行多条语句,使用块语句({ … })将这些语句分组;若不想执行语句,则使用空语句。 statement2 如果condition为假且 else从句存在时执行的语句。可为任意语句,包括块语句和嵌套的if语句。 当指定条件为真,if 语句会执行一段语句。如果条件为...
In all the programming languages I’ve come across, the If statement is extensively used for this purpose.It’s actually quite simple to use the if statement and here is the format of an if statement. if (condition) { statements to execute } When JavaScript encounters an if statement, ...
When you write code, you will often need to use conditional statements, such as "if" statements. Here's an explanation of the JavaScript If statement.A conditional statement refers to a piece of code that does one thing based on one condition, and another based on another condition. In ...
Use theelse ifstatement to specify a new condition if the first condition is false. Syntax if(condition1) { //block of code to be executed if condition1 is true }elseif(condition2) { //block of code to be executed if the condition1 is false and condition2 is true ...
Javascript Statement if Javascript examples for Statement:if HOME Javascript Statement if
if语句是最基本的决策结构,它执行一个布尔表达式,并根据表达式的真或假来执行相应的代码块。 基本的if结构如下: if (condition) { // 如果条件为真,则执行这里的代码 } 你还可以添加一个else子句来处理条件为假的情况: if (condition) { // 如果条件为真,则执行这里的代码 } else { // 否则,执行这里...
In this tutorial, we will be showing you how to write the if, else, and else if conditional statements in JavaScript. In JavaScript, a conditional statement allows you to perform an action when a particular condition is considered truthy. These are a crucial part of JavaScript as it allows ...
1 JavaScript的组成和书写位置 Javascript:运行在客户端(浏览器)的脚本语言,JavaScript的解释器被称为JavaScript引擎,为浏览器的一部分,与java没有直接的关系。 Java:服务器端的编程语言。 API:Application Programming Inte
// A conditional statement if (x === 0) { // Is `x` equal to zero? x = 123; } // Defining function `baz` with parameters `a` and `b` function baz(a, b) { return a + b; } 注意等号的两种不同用法: 单个等号(=)用于将一个值赋给一个变量。
`x`foo(x,y);// calling function `foo` with parameters `x` and `y`obj.bar(3);// calling method `bar` of object `obj`// A conditional statementif(x===0){// Is `x` equal to zero?x=123;}// Defining function `baz` with parameters `a` and `b`functionbaz(a,b){returna+b...