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The JavaScript if…else statement is used to execute/skip a block of code based on a condition. In this tutorial, we will learn about the JavaScript if…else statement with examples.
The if StatementUse the if statement to specify a block of JavaScript code to be executed if a condition is true.Syntaxif (condition) { block of code to be executed if the condition is true } Note that if is in lowercase letters. Uppercase letters (If or IF) will generate a ...
The else if statement Random link Switch statement Conditionals explained JavaScript Loops For loop Looping through HTML headers While loop Do While loop Break a loop Break and continue a loop Use a for...in statement to loop through the elements of an object ...
Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML and more.
We can return a value from a JavaScript function using the return statement.// function to find square of a number function findSquare(num) { // return square return num * num; } // call the function and store the result let square = findSquare(3); console.log(`Square: ${square...
Forcontrol flow statements, the body is a single statement. Here are two examples: if(obj!==null)obj.foo();while(x>0)x--; However, any statement canalways be replaced by ablock, curly bracescontaining zero or more statements. Thus, you can also write: ...
JavaScript 入门指南(全) 原文:Beginning JavaScript 协议:CC BY-NC-SA 4.0 一、JavaScript 简介 这些年来,avaScript 发生了很大变化。我们目前正处于一个 JavaScript 库的时代,你可以构建任何你想构建的东西。JavaScri
Roughly, a statement performs an action. Loops andifstatements are examples of statements. A program is basically a sequence of statements (we’re ignoring declarations here). Wherever JavaScript expects a statement, you can also write an expression. Such a statement is called anexpression statement...
QuickJS 是在 MIT 许可下发的一个轻量 js 引擎包含 js 的编译器和解释器,支持最新 TC39 的 ECMA-262 标准。QuickJS 和其它 js 引擎的性能对比,可以参看 QuickJS 的 benchmark 对比结果页,从结果看,JerryScript 内存和体积小于 QuickJS,但各项性能均低于 QuickJS,Hermes 体积和内存大于 QuickJS,性能和 QuickJS 差...