Every programming language has it—the basic Hello, World! '. Add the below code. But that’s an advanced topic, we’ll talk about modules in another part of the tutorial. So Let’s start With a JavaScript Hello World first program. This attribute was meant to show the language of the script. The first way that we can write this program is by using the alert() method, which will display an alert box over your current window with a specified message (in this case, it will be “Hello, World!”) and an OK button that will allow the user to close the alert. Most common are: console.log() document.write() alert() Each of the above method have different ways of outputing the content. Don’t worry about all of the punctuation (the parentheses, quotes, and semicolon) just yet. To select an HTML element, JavaScript most often uses the document.getElementById() method. To write the “Hello, World!” program, first open up your preferred web browser’s JavaScript Console. const hello = "Hello"; // You can see on the right the result of the TypeScript compiler: this is vanilla JavaScript which can run on browsers, servers or anywhere really. with the name variable: This entire expression will be put within the parentheses of the console.log() method so that we will receive a greeting as output. You get paid; we donate to tech nonprofits. The example above can be split into two scripts to work: There is much more to learn about browser scripts and their interaction with the webpage. JavaScript 超入門(1) “Hello World” この記事は2016年5月17日に書かれたものです。 内容が古い可能性がありますのでご注意ください。 These comments hide JavaScript code from old browsers that didn’t know how to process the