{"id":45915,"date":"2023-05-24T19:45:31","date_gmt":"2023-05-24T10:45:31","guid":{"rendered":"https:\/\/kinqsta.com\/jp\/?p=45915&post_type=knowledgebase&preview_id=45915"},"modified":"2025-10-02T04:46:42","modified_gmt":"2025-10-01T19:46:42","slug":"what-is-jsx","status":"publish","type":"post","link":"https:\/\/kinqsta.com\/jp\/blog\/what-is-jsx\/","title":{"rendered":"React\u3067\u4f7f\u7528\u3059\u308bJSX\u306e\u57fa\u672c\u3092\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac"},"content":{"rendered":"

\u5f93\u6765\u3001\u958b\u767a\u8005<\/a>\u306f\u30de\u30fc\u30af\u30a2\u30c3\u30d7\u3068\u30ed\u30b8\u30c3\u30af\u3092\u5225\u3005\u306e\u30d5\u30a1\u30a4\u30eb\u306b\u5206\u3051\u3001\u69cb\u9020\u306b\u306fHTML<\/a>\u3001\u30b9\u30bf\u30a4\u30ea\u30f3\u30b0\u306b\u306fCSS<\/a>\u3092\u4f7f\u7528\u3057\u3001\u30a4\u30f3\u30bf\u30e9\u30af\u30b7\u30e7\u30f3\u3084\u30c7\u30fc\u30bf\u64cd\u4f5c\u306b\u306fJavaScript<\/a>\u3092\u8a18\u8ff0\u3057\u3066\u304d\u307e\u3057\u305f\u3002<\/p>\n

\u3057\u304b\u3057\u3001\u3053\u308c\u3089\u306e\u6280\u8853\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u958b\u767a\u30d7\u30ed\u30bb\u30b9\u3092\u7c21\u7d20\u5316\u3057\u3001\u8907\u96d1\u306a\u30e6\u30fc\u30b6\u30fc\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u7c21\u5358\u306b\u69cb\u7bc9\u3067\u304d\u308b\u65b9\u6cd5\u304c\u3042\u308b\u3068\u3057\u305f\u3089\u3069\u3046\u3067\u3057\u3087\u3046\u304b\u3002\u305d\u3053\u3067\u767b\u5834\u3059\u308b\u306e\u304cJSX\u3067\u3059\u3002<\/p>\n

\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001JSX\u3068\u306f\u4f55\u304b\u3001\u3069\u306e\u3088\u3046\u306b\u6a5f\u80fd\u3059\u308b\u306e\u304b\u3001\u305d\u3057\u3066\u306a\u305c\u30a6\u30a7\u30d6\u958b\u767a<\/a>\u306b\u304a\u3044\u3066\u3001\u3053\u308c\u304c\u52d5\u7684\u306a\u30e6\u30fc\u30b6\u30fc\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u69cb\u7bc9\u3059\u308b\u305f\u3081\u306b\u91cd\u8981\u306a\u306e\u304b\u3092\u5b66\u3073\u307e\u3059\u3002<\/p>\n

\u3053\u306e\u9769\u547d\u7684\u306a\u6280\u8853\u306b\u3064\u3044\u3066\u3001\u8a73\u3057\u304f\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n

<\/div><\/kinsta-auto-toc>\n

JSX\u3068\u306f<\/h2>\n

JSX\uff08JavaScript XML<\/a>\uff09\u306f\u3001JavaScript\u306e\u69cb\u6587\u62e1\u5f35\u3067\u3001JavaScript\u30d5\u30a1\u30a4\u30eb\u5185\u306bHTML\u306e\u3088\u3046\u306a\u30b3\u30fc\u30c9\u3092\u8a18\u8ff0\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b\u3082\u306e\u3067\u3059\u3002Meta\uff08\u65e7Facebook\uff09\u306b\u3088\u3063\u3066\u958b\u767a\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n

JSX\u306e\u69cb\u6587\u306fHTML\u306b\u4f3c\u3066\u304a\u308a\u3001\u958b\u9589\u30bf\u30b0\u3001\u5c5e\u6027\u3001\u5165\u308c\u5b50\u8981\u7d20\u306a\u3069\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

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const heading = <h1>Hello, JSX!<\/h1>;<\/code><\/pre>\n
\u3053\u306e\u30b3\u30fc\u30c9\u306fHTML\u306e\u3088\u3046\u306b\u898b\u3048\u307e\u3059\u304c\u3001JavaScript<\/a>\u3067\u3059\u3002const\u304cheading\u3068\u3044\u3046\u65b0\u3057\u3044\u5909\u6570\u3092\u4f5c\u308a\u3001\u305d\u306e\u5909\u6570\u306e\u5024\u304cJSX\u5f0f\u306e\u7d50\u679c\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n
JSX\u306e\u4ed5\u7d44\u307f<\/h2>\n
JSX\u306f\u3001\u30d6\u30e9\u30a6\u30b6<\/a>\u3067\u5b9f\u884c\u3055\u308c\u308b\u524d\u306b\u3001\u901a\u5e38\u306eJavaScript\u306b\u5909\u63db\u3055\u308c\u307e\u3059\u3002\u3053\u306e\u5909\u63db\u306f\u3001\u30c8\u30e9\u30f3\u30b9\u30d1\u30a4\u30e9\u3068\u547c\u3070\u308c\u308b\u30c4\u30fc\u30eb\u3092\u4f7f\u3063\u3066\u884c\u308f\u308c\u307e\u3059\u3002JSX\u306e\u6700\u3082\u4e00\u822c\u7684\u306a\u30c8\u30e9\u30f3\u30b9\u30d1\u30a4\u30e9\u306fBabel\u3067\u3059\u3002<\/p>\n
Babel\u306f\u3001JSX\u306e\u30b3\u30fc\u30c9\u3092\u4e00\u9023\u306e\u95a2\u6570\u547c\u3073\u51fa\u3057\u306b\u5909\u63db\u3057\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u95a2\u6570\u547c\u3073\u51fa\u3057\u306f\u3001JSX\u3067\u66f8\u304b\u308c\u305fHTML\u306e\u3088\u3046\u306a\u30b3\u30fc\u30c9\u3068\u540c\u7b49\u306b\u306a\u308a\u307e\u3059\u3002\u305d\u3057\u3066\u3001\u30d6\u30e9\u30a6\u30b6\u306f\u3001\u7d50\u679c\u3068\u3057\u3066\u5f97\u3089\u308c\u305fJavaScript\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u4f8b\u3048\u3070\u3001\u6b21\u306e\u3088\u3046\u306aJSX\u30b3\u30fc\u30c9\u3067\u3059\u3002<\/p>\n
const element = <h1>Hello, world!<\/h1>;<\/code><\/pre>\n
\u3053\u308c\u304c\u3001\u6b21\u306e\u3088\u3046\u306aJavaScript\u30b3\u30fc\u30c9\u306b\u5909\u63db\u3055\u308c\u307e\u3059\u3002<\/p>\n
const element = React.createElement(\"h1\", null, \"Hello, world!\");<\/code><\/pre>\n
\u3053\u306e\u5909\u63db\u306b\u3088\u308a\u3001\u958b\u767a\u8005\u306fJavaScript\u306e\u6027\u80fd\u3068\u67d4\u8edf\u6027\u3092\u751f\u304b\u3057\u306a\u304c\u3089\u3001\u6163\u308c\u89aa\u3057\u3093\u3060\u8aad\u307f\u3084\u3059\u3044\u69cb\u6587\u3067\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
JSX\u3068React<\/h2>\n
JSX\u306fReact<\/a>\u306b\u4e0d\u53ef\u6b20\u306a\u8981\u7d20\u3067\u3042\u308a\u3001\u3053\u308c\u306b\u3088\u308a\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u30de\u30fc\u30af\u30a2\u30c3\u30d7\u3068\u30ed\u30b8\u30c3\u30af\u30921\u3064\u306e\u30d5\u30a1\u30a4\u30eb\u306b\u8a18\u8ff0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u4ee5\u4e0b\u306f\u3001React\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8<\/a>\u306eJSX\u30b3\u30fc\u30c9\u306e\u7c21\u5358\u306a\u4f8b\u3067\u3059\u3002<\/p>\n
import React from 'react';\n\nfunction Greet() {\n  return <h1>Hello World!<\/h1>;\n}\n\nexport default Greeting;<\/code><\/pre>\n
\u3053\u306e\u4f8b\u3067\u306f\u3001Greet<\/code>\u3068\u3044\u3046\u540d\u524d\u306e\u95a2\u6570\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304c\u3042\u308a\u3001h1<\/code>\u8981\u7d20\u3092\u6328\u62f6\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\u3068\u3057\u3066\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
React\u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u3001\u3053\u306e\u30b3\u30fc\u30c9\u3092\u30d6\u30e9\u30a6\u30b6\u3067\u5b9f\u884c\u3067\u304d\u308b\u6700\u9069\u5316\u3055\u308c\u305fJavaScript\u30b3\u30fc\u30c9\u306b\u5909\u63db\u3057\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u753b\u9762\u4e0a\u306b\u8868\u793a\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n
\u4ee5\u4e0b\u306f\u3001React\u30b3\u30f3\u30d1\u30a4\u30e9\u304cGreet<\/code>\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u5909\u63db\u3057\u305f\u7d50\u679c\u3067\u3059\u3002<\/p>\n
import React from 'react'\n\nfunction Greet() {\n  return React.createElement(\"h1\", {}, \"Hello, World!\")\n}<\/code><\/pre>\n
\u3053\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001JSX\u30b3\u30fc\u30c9\u306f\u3001\u5143\u306eJSX\u30b3\u30fc\u30c9\u3068\u540c\u3058\u69cb\u9020\u3068\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u4f5c\u6210\u3059\u308bReact.createElement<\/code> \u306b\u5909\u63db\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
React\u304cJSX\u30b3\u30fc\u30c9\u3092\u30b3\u30f3\u30d1\u30a4\u30eb\u3059\u308b\u969b\u306b\u3001\u4e0a\u8a18\u306e\u3088\u3046\u306a\u5909\u63db\u304c\u821e\u53f0\u88cf\u3067\u8d77\u3053\u3063\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30d6\u30e9\u30a6\u30b6\u306b\u3088\u308b\u5b9f\u884c\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u5909\u63db\u3055\u308c\u305f\u30b3\u30fc\u30c9\u306f\u3001\u5143\u306eJSX\u30b3\u30fc\u30c9\u3088\u308a\u3082\u53ef\u8aad\u6027\u304c\u4f4e\u304f\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
React\u30d0\u30fc\u30b8\u30e7\u30f317\u3067\u306f\u3001\u65b0\u3057\u3044JSX\u5909\u63db<\/a>\u6a5f\u80fd\u304c\u5c0e\u5165\u3055\u308c\u3001React\u30d1\u30c3\u30b1\u30fc\u30b8\u306e\u65b0\u3057\u3044\u30a8\u30f3\u30c8\u30ea\u30dd\u30a4\u30f3\u30c8\u304b\u3089\u7279\u5225\u306a\u95a2\u6570\u3092\u81ea\u52d5\u7684\u306b\u30a4\u30f3\u30dd\u30fc\u30c8\u3059\u308b\u3053\u3068\u3067\u3001\u30d5\u30a1\u30a4\u30eb\u306e\u5148\u982d\u3067React\u3092\u30a4\u30f3\u30dd\u30fc\u30c8\u3057\u306a\u304f\u3066\u3082JSX\u3092\u4f7f\u7528\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n
\/\/ \u30b3\u30f3\u30d1\u30a4\u30e9\u304c\u633f\u5165\uff08\u81ea\u5206\u3067\u30a4\u30f3\u30dd\u30fc\u30c8\u3059\u308b\u5fc5\u8981\u306a\u3057\uff09\nimport {jsx as _jsx} from 'react\/jsx-runtime';\n\nfunction App() {\n  return _jsx('h1', { children: 'Hello world' });\n}<\/code><\/pre>\n
JSX\u3067JavaScript\u306e\u5f0f\u3092\u4f7f\u3046<\/h3>\n
JSX\u3067\u306f\u3001JavaScript\u306e\u5f0f\u3092\u30de\u30fc\u30af\u30a2\u30c3\u30d7\u5185\u306b\u76f4\u63a5\u57cb\u3081\u8fbc\u3093\u3067\u3001\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u52d5\u7684\u306b\u751f\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001JavaScript\u30b3\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001JSX\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u5185\u3067\u5024\u306e\u8a08\u7b97\u3001\u64cd\u4f5c\u3001\u304a\u3088\u3073\u6761\u4ef6\u4ed8\u304d\u3067\u30b3\u30f3\u30c6\u30f3\u30c4\u306e\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3092\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u4ee5\u4e0b\u306e\u4f8b\u3067\u306f\u3001JSX\u5185\u30672\u3064\u306eJavaScript\u306e\u5f0f\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
import React from 'react';\n\nconst MyComponent = () => {\n  const name = 'John';\n  const age = 30;\n\n  return (\n    <div>\n      <h1>Hello, {name}!<\/h1>\n      <p>You are {age} years old.<\/p>\n      <p>Next year, you will be {age + 1} years old.<\/p>\n      {age >= 18 && <p>You are an adult.<\/p>}\n    <\/div>\n  );\n};\n\nexport default MyComponent;<\/code><\/pre>\n
\u3053\u306e\u4f8b\u3067\u306f\u3001{name}<\/code>\u3001{age}<\/code>\u3001{age + 1}<\/code>\u3001{age >= 18 && <p>You are an adult.<\/p>}<\/code>\u306e\u3088\u3046\u306a JavaScript\u306e\u5f0f\u3092\u4f7f\u7528\u3057\u3066\u3001name\u3068age\u306e\u5909\u6570\u306e\u5024\u306b\u57fa\u3065\u304d\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u52d5\u7684\u306b\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
JSX\u3067CSS\u3092\u4f7f\u3046<\/h3>\n
CSS\u306f\u3001\u30a4\u30f3\u30e9\u30a4\u30f3\u30b9\u30bf\u30a4\u30eb\u3001\u500b\u5225\u306eCSS\u30d5\u30a1\u30a4\u30eb\u3001CSS in JS\u30e9\u30a4\u30d6\u30e9\u30ea\u306a\u3069\u3001\u3055\u307e\u3056\u307e\u306a\u65b9\u6cd5\u3067JSX\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306b\u9069\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u30a4\u30f3\u30e9\u30a4\u30f3\u30b9\u30bf\u30a4\u30eb\u306f\u3001JavaScript\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f7f\u7528\u3057\u3066JSX\u30de\u30fc\u30af\u30a2\u30c3\u30d7\u5185\u3067\u76f4\u63a5\u5b9a\u7fa9\u3055\u308c\u3001\u5916\u90e8CSS\u30d5\u30a1\u30a4\u30eb\u307e\u305f\u306fCSS in JS\u30e9\u30a4\u30d6\u30e9\u30ea\u3067\u306f\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u5916\u90e8\u304a\u3088\u3073\u30e2\u30b8\u30e5\u30fc\u30eb\u306b\u57fa\u3065\u3044\u305f\u30b9\u30bf\u30a4\u30eb\u8a2d\u5b9a\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u4ee5\u4e0b\u306e\u4f8b\u3067\u306f\u3001JavaScript\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f7f\u7528\u3057\u3066\u5b9a\u7fa9\u3055\u308c\u305f\u30a4\u30f3\u30e9\u30a4\u30f3\u30b9\u30bf\u30a4\u30eb\u3092\u3001JSX\u306estyle\u5c5e\u6027\u3092\u4f7f\u7528\u3057\u3066\u8981\u7d20\u306b\u9069\u7528\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
import React from 'react';\n\nconst MyComponent = () => {\n  const styles = {\n    backgroundColor: 'blue',\n    color: 'white',\n    padding: '10px'\n  };\n\n  return (\n    <div style={styles}>\n      <h1>Hello, World!<\/h1>\n      <p>This is a component with inline styles.<\/p>\n    <\/div>\n  );\n};\n\nexport default MyComponent;<\/code><\/pre>\n
\u3053\u306e\u4f8b\u3067\u306f\u3001backgroundColor<\/code>\u3001color<\/code>\u3001padding \u306a\u3069\u306eCSS\u30d7\u30ed\u30d1\u30c6\u30a3\u3092styles\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30ad\u30fc\u3068\u5024\u306e\u30da\u30a2\u3068\u3057\u3066\u8a2d\u5b9a\u3057\u3001\u305d\u306e\u5024\u3092CSS\u5024\u3092\u8868\u3059\u6587\u5b57\u5217\u3068\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u6ce8\uff09<\/strong>\u30a4\u30f3\u30e9\u30a4\u30f3\u30b9\u30bf\u30a4\u30eb\u306b\u306f\u67d4\u8edf\u6027\u3068\u7c21\u4fbf\u6027\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u3088\u308a\u8907\u96d1\u306a\u30b9\u30bf\u30a4\u30eb\u3084\u5927\u898f\u6a21\u306a\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u306f\u3001CSS\u30af\u30e9\u30b9\u307e\u305f\u306fCSS in JS\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u63a8\u5968\u3055\u308c\u307e\u3059\u3002<\/p>\n
\u91cd\u8981\u306aJSX\u306e\u30eb\u30fc\u30eb6\u9078<\/h2>\n
JSX\u306e\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3068\u304d\u306b\u306f\u3001\u59a5\u5f53\u3067\u8aad\u307f\u3084\u3059\u3044\u3082\u306e\u306b\u3059\u308b\u305f\u3081\u306b\u5b88\u308b\u3079\u304d\u30eb\u30fc\u30eb\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
1. \u5e38\u306b1\u3064\u306e\u30eb\u30fc\u30c8\u8981\u7d20\u3092\u8fd4\u3059<\/h3>\n
JSX\u3067\u306f\u3001\u5e38\u306b1\u3064\u306e\u30eb\u30fc\u30c8\u8981\u7d20\u3092\u8fd4\u3055\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002\u3064\u307e\u308a\u3001JSX\u306e\u30b3\u30fc\u30c9\u306f\u3059\u3079\u3066\u3001\u4e00\u756a\u5916\u5074\u306b\u3042\u308b1\u3064\u306e\u8981\u7d20\u306b\u53ce\u3081\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306f\u6709\u52b9\u306aJSX\u3067\u3059\u3002<\/p>\n
return (\n  <div>\n    <h1>Hello World!<\/h1>\n    <p>This is my first React component.<\/p>\n  <\/div>\n)<\/code><\/pre>\n
\u3057\u304b\u3057\u3001\u4ee5\u4e0b\u306f1\u3064\u306e\u8981\u7d20\u3067\u306f\u306a\u304f2\u3064\u306e\u8981\u7d20\u3092\u8fd4\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u6709\u52b9\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n
return (\n  <h1>Hello World!<\/h1>\n  <p>This is my first React component.<\/p>\n)<\/code><\/pre>\n
\u3053\u308c\u306f\u3001HTML\u30b3\u30fc\u30c9\u3092JSX\u306b\u5909\u63db\u3059\u308b\u969b\u306b\u6ce8\u610f\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u70b9\u3067\u3059\u3002<\/p>\n
2. class\u306e\u4ee3\u308f\u308a\u306bclassName\u3092\u4f7f\u3046<\/h3>\n
HTML\u3067\u306f\u3001\u8981\u7d20\u306eCSS\u30af\u30e9\u30b9\u3092\u6307\u5b9a\u3059\u308b\u305f\u3081\u306b\u3001class<\/code>\u5c5e\u6027\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u3057\u304b\u3057\u3001JSX\u3067\u306f\u3001\u4ee3\u308f\u308a\u306bclassName<\/code>\u5c5e\u6027\u3092\u4f7f\u7528\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\/\/ \u25cb\n<div className=\"my-class\">This element has a CSS class.<\/div>\n\n\/\/ X\n<div class=\"my-class\">This element has a CSS class.<\/div><\/code><\/pre>\n
class<\/code>\u306e\u4ee3\u308f\u308a\u306bclassName<\/code>\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002\u3053\u308c\u3067\u547d\u540d\u306e\u885d\u7a81\u3092\u907f\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
3. JavaScript\u306e\u5f0f\u306b\u306f\u4e2d\u62ec\u5f27\u3092\u4f7f\u7528\u3059\u308b<\/h3>\n
JSX\u30b3\u30fc\u30c9\u306e\u4e2d\u306bJavaScript\u306e\u5f0f\u3092\u542b\u3081\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u3001\u4e2d\u62ec\u5f27{}<\/strong>\u3067\u56f2\u3080\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u52d5\u7684\u306a\u30c7\u30fc\u30bf\u306e\u8868\u793a\u304b\u3089\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u6761\u4ef6\u4ed8\u304d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u307e\u3067\u3001\u3042\u3089\u3086\u308b\u7528\u9014\u306b\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306f\u305d\u306e\u4f8b\u3067\u3059\u3002<\/p>\n
\/\/ \u25cb\n<div>{myVariable}<\/div>\n\n\/\/ X\n<div>myVariable<\/div><\/code><\/pre>\n
\u4e2d\u62ec\u5f27\u306e\u4e2d\u3067\u306f\u3001\u6b21\u306e\u3088\u3046\u306a\u8a08\u7b97\u3092\u5b9f\u884c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
<p>The total cost is {25*10}<\/p><\/code><\/pre>\n
\u307e\u305f\u3001\u4e2d\u62ec\u5f27\u306e\u4e2d\u3067\u306f\u3001\u4e09\u9805\u6f14\u7b97\u5b50\u3092\u4f7f\u3063\u3066\u6761\u4ef6\u6587\u3092\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n
<h1>{(x) < 15 ? \"Welcome\" : \"Goodbye\"}<\/h1><\/code><\/pre>\n
\u4ee5\u4e0b\u306b\u3001React\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u4f7f\u3063\u305f\u3088\u308a\u826f\u3044\u4f8b\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n
function Greeting() {\n  const isLoggedIn = true;\n\n  return (\n    <div>\n      {isLoggedIn ? (\n        <h1>Welcome back!<\/h1>\n      ) : (\n        <h1>Please log in.<\/h1>\n      )}\n    <\/div>\n  );\n}<\/code><\/pre>\n
\u3053\u306e\u4f8b\u3067\u306f\u3001Greeting<\/strong>\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u5b9a\u7fa9\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306f\u3001\u4e09\u9805\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\u3057\u3066\u3001isLoggedIn<\/code>\u306e\u5024\u306b\u57fa\u3065\u3044\u3066\u6761\u4ef6\u4ed8\u304d\u3067\u6328\u62f6\u3092\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3057\u307e\u3059\u3002isLoggedIn<\/code>\u304ctrue<\/code>\u306e\u5834\u5408\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306f\u30c6\u30ad\u30b9\u30c8”Welcome back!”\u3092\u542b\u3080h1<\/code> \u8981\u7d20\u3092\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3057\u307e\u3059\u3002isLoggedIn<\/code>\u304cfalse<\/code>\u306e\u5834\u5408\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306f”Please log in.”\u3068\u3044\u3046\u30c6\u30ad\u30b9\u30c8\u3092\u542b\u3080h1<\/code>\u8981\u7d20\u3092\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3057\u307e\u3059\u3002<\/p>\n
4. \u307b\u3068\u3093\u3069\u306e\u3082\u306e\u306bcamelCase\u3092\u4f7f\u7528\u3059\u308b<\/h3>\n
JSX\u3067\u306f\u3001\u5c5e\u6027\u3001\u30a4\u30d9\u30f3\u30c8\u30cf\u30f3\u30c9\u30e9\u3001\u5909\u6570\u540d\u306a\u3069\u3001\u307b\u3068\u3093\u3069\u306e\u3082\u306e\u306bcamelCase\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u3053\u306e\u898f\u5247\u306f\u3001JavaScript\u306e\u547d\u540d\u898f\u5247\u3068\u4e00\u81f4\u3057\u3066\u304a\u308a\u3001\u53ef\u8aad\u6027\u3092\u7dad\u6301\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/p>\n
\u4f8b\u3048\u3070\u3001onclick<\/code>\u306e\u4ee3\u308f\u308a\u306bonClick<\/code>\u3092\u3001class<\/code>\u306e\u4ee3\u308f\u308a\u306bclassName<\/code>\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n
\/\/ \u25cb\n<button onClick={handleClick} className=\"btn\">Click me!<\/button>\n\n\/\/ X\n<button onclick={handle_click} class=\"btn\">Click me!<\/button><\/code><\/pre>\n
5. \u30bf\u30b0\u3092\u5e38\u306b\u9589\u3058\u308b<\/h3>\n
JSX\u3067\u306f\u3001\u305f\u3068\u3048\u30bf\u30b0\u306b\u4e2d\u8eab\u304c\u306a\u304f\u3066\u3082\u3001\u5e38\u306b\u9589\u3058\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\/\/ \u25cb\n<div><\/div>\n\n\/\/ X\n<div\/><\/code><\/pre>\n
6. \u7a7a\u306e\u8981\u7d20\u306f\u30bf\u30b0\u5358\u4f53\u3067\u5b8c\u7d50<\/h3>\n
\u672c\u8cea\u7684\u306b\u4e2d\u8eab\u3092\u6301\u305f\u306a\u3044\u8981\u7d20\u3067\u3042\u308c\u3070\u3001\u958b\u59cb\/\u7d42\u4e86\u30bf\u30b0\u306e\u4ee3\u308f\u308a\u306b\u30bf\u30b0\u5358\u4f53\u3067\u5b8c\u7d50\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\/\/ \u25cb\n<img src=\"my-image.jpg\" alt=\"My Image\"\/>\n\n\/\/ X\n<img src=\"my-image.jpg\" alt=\"My Image\"><\/img><\/code><\/pre>\n
\u306a\u305cJSX\u304c\u30a6\u30a7\u30d6\u958b\u767a\u306b\u91cd\u8981\u306a\u306e\u304b<\/h2>\n
JSX\u304c\u30a6\u30a7\u30d6\u958b\u767a\u306b\u3068\u3063\u3066\u91cd\u8981\u306a\u306e\u306f\u3001\u6b21\u306e\u3088\u3046\u306a\u7406\u7531\u304b\u3089\u3067\u3059\u3002<\/p>\n
    \n
  1. \u76f4\u611f\u7684\u3067\u306a\u3058\u307f\u3084\u3059\u3044\u65b9\u6cd5\u3067\u30e6\u30fc\u30b6\u30fc\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u69cb\u7bc9\u3067\u304d\u308b\u3002<\/li>\n<\/ol>\n
      \n
    1. DOM\u3092\u76f4\u63a5\u64cd\u4f5c\u3059\u308b\u4ee3\u308f\u308a\u306b\u3001JSX\u3092\u4f7f\u3063\u3066\u3001HTML\u3092\u66f8\u304f\u306e\u3068\u540c\u3058\u3088\u3046\u306a\u65b9\u6cd5\u3067\u30e6\u30fc\u30b6\u30fc\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u69cb\u9020\u3092\u8a18\u8ff0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/li>\n<\/ol>\n
        \n
      1. \u52b9\u7387\u7684\u3067\u67d4\u8edf\u306a\u958b\u767a\u304c\u53ef\u80fd\u306b\u306a\u308b\u3002JSX\u306fJavaScript\u306a\u306e\u3067\u3001\u958b\u767a\u8005\u306fJavaScript\u306e\u3042\u3089\u3086\u308b\u6a5f\u80fd\u3092\u6d3b\u7528\u3057\u3001\u3088\u308a\u8907\u96d1\u3067\u30c0\u30a4\u30ca\u30df\u30c3\u30af\u306a\u30e6\u30fc\u30b6\u30fc\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u4f5c\u308b\u3053\u3068\u304c\u53ef\u80fd\u3002<\/li>\n<\/ol>\n
          \n
        1. \u73fe\u4ee3\u306e\u30a6\u30a7\u30d6\u958b\u767a\u3067\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u69cb\u7bc9\u3059\u308b\u4e0a\u3067\u4eba\u6c17\u306e\u9078\u629e\u80a2\u3067\u3042\u308bReact\u30e9\u30a4\u30d6\u30e9\u30ea<\/a>\u306e\u91cd\u8981\u306a\u69cb\u6210\u8981\u7d20\u3002React\u3092\u4f7f\u3044\u305f\u3044\u306a\u3089\u3001JSX\u3092\u5b66\u3076\u5fc5\u8981\u304c\u3042\u308b\u3002<\/li>\n<\/ol>\n\n
          \u307e\u3068\u3081<\/h2>\n
          JSX\u306fJavaScript\u306e\u69cb\u6587\u62e1\u5f35\u3067\u3001JavaScript\u30d5\u30a1\u30a4\u30eb\u5185\u306bHTML\u306e\u3088\u3046\u306a\u30de\u30fc\u30af\u30a2\u30c3\u30d7\u3092\u8a18\u8ff0\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30a6\u30a7\u30d6\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u52d5\u7684\u3067\u30a4\u30f3\u30bf\u30e9\u30af\u30c6\u30a3\u30d6\u306a\u30e6\u30fc\u30b6\u30fc\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u4f5c\u6210\u304c\u5bb9\u6613\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
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