How can JSX code be transformed into regular JavaScript code?

2023-10-04 / 资讯 / 139 阅读

  JSX code can be transformed into regular JavaScript code using a transpiler like Babel. JSX is a syntax extension for JavaScript that allows developers to write HTML-like code within JavaScript. Although modern browsers do not understand JSX directly, transpilers like Babel can convert JSX code into regular JavaScript code that browsers can understand.

  Babel, for example, converts JSX code into function calls. It transforms JSX elements into JavaScript createElement calls, which create and return a virtual representation of the corresponding DOM elements. Babel also converts JSX attributes into JavaScript object properties.

  Here's an example to illustrate the transformation. Consider the following JSX code:

  jsx

  const element =

Hello, JSX!

;

  Babel can transform this JSX code into regular JavaScript code like this:

  javascript

  const element = React.createElement("h1", { className: "title" }, "Hello, JSX!");

  In the transformed code, the `React.createElement` function is used to create an object representation of the HTML element. The first argument specifies the element type, the second argument contains the attributes (such as className), and the third argument contains the content of the element.

  It's important to note that in order to use JSX, you need to have a build process that includes Babel and its JSX preset. Babel will then transpile the JSX code into regular JavaScript before it gets executed by the browser.

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