{"id":6639,"date":"2024-01-26T19:13:04","date_gmt":"2024-01-26T10:13:04","guid":{"rendered":"https:\/\/techmania.jp\/blog\/?p=6639"},"modified":"2024-01-29T11:26:05","modified_gmt":"2024-01-29T02:26:05","slug":"vue-js-composition-api","status":"publish","type":"post","link":"https:\/\/techmania.jp\/blog\/vue-js-composition-api\/","title":{"rendered":"Composition API\u3068\u306f\uff1fOptions API\u3068\u306e\u9055\u3044\u3084\u66f8\u304d\u65b9\u3092\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u89e3\u8aac"},"content":{"rendered":"\n

Composition API\u3068\u306f\uff1f<\/h2>\n\n\n

Composition API\u3068\u306f\u3001Vue3\u304b\u3089\u5c0e\u5165\u3055\u308c\u305f\u65b0\u6a5f\u80fd\u3067\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u5b9f\u88c5\u3059\u308bAPI\u3092\u6307\u3057\u307e\u3059\u3002\u300c\u30ea\u30a2\u30af\u30c6\u30a3\u30d6\u306a\u5024\u3084\u305d\u308c\u306b\u95a2\u9023\u3057\u305f\u95a2\u6570\u3092\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304b\u3089\u5207\u308a\u96e2\u3057\u3066\u6271\u3048\u308b\u300d\u3068\u3044\u3046\u7279\u5fb4\u3092\u6301\u3064\u3053\u3068\u304b\u3089\u3001\u30b3\u30fc\u30c9\u306e\u518d\u5229\u7528\u6027\u3084\u4fdd\u5b88\u6027\u306e\u5411\u4e0a<\/strong>\u304c\u671f\u5f85\u3055\u308c\u3066\u3044\u307e\u3059\u3002
Vue2\u306e\u30b5\u30dd\u30fc\u30c8\u304c2023\u5e7412\u670831\u65e5\u3092\u3082\u3063\u3066\u7d42\u4e86\u3057\u305f\u305f\u3081\u3001Vue2\u304b\u3089Vue3\u3078\u306e\u79fb\u884c\u3092\u691c\u8a0e\u3057\u3066\u3044\u308b\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3082\u5897\u3048\u3066\u3044\u308b\u3068\u601d\u3044\u307e\u3059\u3002Vue3\u3078\u306e\u79fb\u884c\u306b\u4f34\u3044\u3001Composition API\u3082\u307e\u3059\u307e\u3059\u5e83\u307e\u308b\u3053\u3068\u304c\u4e88\u6e2c\u3055\u308c\u308b\u305f\u3081\u3001\u672c\u8a18\u4e8b\u304c\u5c11\u3057\u3067\u3082Composition API \u3092\u77e5\u308b\u3068\u3063\u304b\u304b\u308a\u306b\u306a\u308c\u3070\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n

\n

Vue2\u3068Composition API<\/strong><\/p>\n

Composition API \u306f Vue3\u304b\u3089\u5c0e\u5165\u3055\u308c\u305f\u6a5f\u80fd\u3067\u3059\u304c\u3001\u5b9f\u306f Vue2 \u3067\u3082\u6271\u3046\u4e8b\u304c\u3067\u304d\u307e\u3059\u3002
\u5f53\u8a18\u4e8b\u3067\u306fVue3\u3068\u3057\u3066\u306eComposition API\u3092\u7d39\u4ecb\u3057\u3066\u3044\u308b\u306e\u3067\u7701\u304d\u307e\u3059\u304c\u3001\u8208\u5473\u306e\u3042\u308b\u65b9\u306f\u5c0e\u5165\u65b9\u6cd5\u306b\u3064\u3044\u3066\u305c\u3072\u8abf\u3079\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<\/div>\n\n\n

\n<\/a>

\u3042\u306a\u305f\u306e\u3054\u5e0c\u671b\u306b\u6cbf\u3063\u305f\u6848\u4ef6\u304c\u5fc5\u305a<\/span>\u898b\u3064\u304b\u308a\u307e\u3059
\u3010\u30d5\u30ea\u30fc\u30e9\u30f3\u30b9\u5411\u3051\u3011\u9ad8\u53ce\u5165<\/span>\u30fb\u597d\u5f85\u9047<\/span>\u306e\u6848\u4ef6\u3092\u3054\u7d39\u4ecb<\/p><\/a>\n<\/div>\n

\"TECH<\/a><\/div>\n
\n<\/a>

\u226b\u307e\u305a\u306f\u7c21\u535830<\/span>\u79d2\u3067\u7121\u6599\u304a\u554f\u3044\u5408\u308f\u305b<\/span>\u304b\u3089\u226a<\/p><\/a>\n<\/div>\n\n\n\n

Options API\u3068\u306e\u6bd4\u8f03<\/h2>\n\n\n

Options API\u306f\u3001\u524d\u30d0\u30fc\u30b8\u30e7\u30f3\u3067\u3042\u308b Vue2 \u3067\u4e00\u822c\u7684\u306b\u4f7f\u7528\u3055\u308c\u3066\u3044\u305fAPI\u3067\u3042\u308a\u3001data\u3084method\u306a\u3069\u306e\u5404\u30aa\u30d7\u30b7\u30e7\u30f3\u3054\u3068\u306b\u30ed\u30b8\u30c3\u30af\u3092\u5b9a\u7fa9\u3057\u3066\u3044\u304f\u8a18\u6cd5\u304c\u7279\u5fb4\u3067\u3059\u3002
\u5f93\u6765\u306e Options API \u306e\u554f\u984c\u70b9\u3068\u3057\u3066\u3001\u300c\u30ea\u30a2\u30af\u30c6\u30a3\u30d6\u306a\u5024\u3092 View \u304b\u3089\u5207\u308a\u96e2\u305b\u306a\u3044\u305f\u3081\u3001\u30ed\u30b8\u30c3\u30af\u3082\u5206\u96e2\u3067\u304d\u306a\u3044\u300d\u3068\u3044\u3046\u70b9\u304c\u3088\u304f\u6319\u3052\u3089\u308c\u307e\u3059\u3002
\u4e00\u65b9\u3001Composition API \u3067\u306f\u3053\u308c\u3089\u306e\u554f\u984c\u304c\u89e3\u6d88\u3055\u308c\u3001View\u3068\u30ed\u30b8\u30c3\u30af\u3092\u5206\u96e2\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002\u305d\u306e\u7d50\u679c\u3001\u53ef\u8aad\u6027\u304c\u9ad8\u307e\u308a\u30b9\u30c3\u30ad\u30ea\u3068\u3057\u305f\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n

\n

Options API\u3068Composition API\u306e\u3069\u3061\u3089\u3092\u4f7f\u3048\u3070\u3044\u3044\u306e\u304b\uff1f<\/strong><\/p>\n

\u516c\u5f0f\u306e\u6587\u7ae0\u3092\u565b\u307f\u7815\u3044\u3066\u8f09\u305b\u308b\u3068\u300cComposition API \u306f\u5927\u898f\u6a21\u306a\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306b\u304a\u3044\u3066\u5229\u70b9\u3092\u6d3b\u304b\u3057\u3084\u3059\u3044\u304c\u3001\u5c0f\u301c\u4e2d\u898f\u6a21\u306e\u958b\u767a\u3067\u3042\u308c\u3070 Options API \u3067\u3082\u554f\u984c\u306a\u3044\u300d\u3068\u306e\u3053\u3068\u3067\u3059\u3002
Options API \u304c\u5ec3\u6b62\u3055\u308c\u308b\u4e88\u5b9a\u306f\u4eca\u306e\u3068\u3053\u308d\u306a\u3044\u3088\u3046\u306a\u306e\u3067\u3001\u500b\u4eba\u958b\u767a\u3067\u3069\u3061\u3089\u3092\u4f7f\u3046\u304b\u8ff7\u3063\u305f\u969b\u306b\u306f\u3001\u597d\u307f\u3067\u9078\u3093\u3067\u307f\u3066\u3082\u826f\u3044\u3068\u601d\u3044\u307e\u3059\u3002
\u53c2\u8003\uff1ahttps:\/\/vuejs.org\/guide\/extras\/composition-api-faq.html<\/a><\/p>\n<\/div>\n\n\n

Composition API\u306e\u8a18\u8ff0\u65b9\u6cd5<\/h2>\n\n\n\n

script setup<\/h3>\n\n\n

Composition API\u3067\u306f\u3001\u901a\u5e38\u306e<script><\/code>\u3067\u306f\u306a\u304f<script setup><\/code>\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002 \u3053\u306e<script setup><\/code>\u3068\u306f\u3001Vue3.2\u3067\u6b63\u5f0f\u30ea\u30ea\u30fc\u30b9\u3055\u308c\u305fComposition API\u306e\u30b7\u30f3\u30bf\u30c3\u30af\u30b9\u30b7\u30e5\u30ac\u30fc\uff08\u7cd6\u8863\u69cb\u6587\uff09\u3067\u3059\u3002<\/p>\n

<script><\/code>\u30d6\u30ed\u30c3\u30af\u306f\u3001\u30c7\u30fc\u30bf\u3084\u30e1\u30bd\u30c3\u30c9\u3092export default<\/code>\u3067\u660e\u793a\u7684\u306b\u6307\u5b9a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u304c\u3001<script setup><\/code>\u3092\u4f7f\u3046\u3068\u3001\u3053\u308c\u3089\u306e\u5b9a\u7fa9\u304c\u7c21\u6f54\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n

<\/p>\n\n\n

<template>\n <div>{{ count }}<\/div>\n <button @click=\"increment\">click\uff01<\/button>\n<\/template>\n\n<script setup>\nlet count = 0;\nconst increment = () => count++;\n<\/script><\/code><\/pre>\n\n\n
\n
SFC( Single File Component)\u306b\u3064\u3044\u3066<\/strong><\/p>\n
\u4e0a\u8a18\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u306e\u3088\u3046\u306btemplate\u3001script\u3001style\u3092\u4e00\u3064\u306e\u30d5\u30a1\u30a4\u30eb\u3067\u7ba1\u7406\u3057\u3066\u3044\u308b\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u3053\u3068\u3092SFC\uff08\u5358\u4e00\u30d5\u30a1\u30a4\u30eb\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\uff09<\/strong>\u3068\u8a00\u3044\u3001Vue.js\u72ec\u81ea\u306e\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306b\u306a\u308a\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u3053\u306e\u307e\u307e\u3060\u3068\u5909\u6570<\/span>count<\/code>\u306fDOM\u306b\u306f\u53cd\u6620\u3055\u308c\u305a\u3001\u30dc\u30bf\u30f3\u3092\u62bc\u3057\u3066\u3082\u6570\u5b57\u304c\u5897\u3048\u308b\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u3064\u307e\u308a<\/span>count<\/code>\u306f<\/span>\u30ea\u30a2\u30af\u30c6\u30a3\u30d6\u306a\u5024<\/strong>\u3068\u306f\u8a00\u3048\u306a\u3044\u306e\u3067\u3059\u3002<\/span>\u5909\u6570\u3092\u30ea\u30a2\u30af\u30c6\u30a3\u30d6\u306b\u3059\u308b\u305f\u3081\u306b\u306f\u6b21\u306b\u8aac\u660e\u3059\u308b<\/span>ref<\/code>\u3068<\/span>reactive<\/code>\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/span><\/p>\n<\/div>\n
<\/p>\n
\n
\u30ea\u30a2\u30af\u30c6\u30a3\u30d6\u306a\u5024\u3068\u306f<\/strong><\/p>\n
\u5909\u6570\u306e\u5024\u3092\u5909\u66f4\u3059\u308b\u3068DOM\u3078\u306e\u53cd\u6620\u64cd\u4f5c\u3092JS\u3067\u8a18\u8ff0\u3057\u306a\u304f\u3068\u3082DOM\u3078\u81ea\u52d5\u53cd\u6620\u3055\u308c\u308b\u5c5e\u6027\u3092\u6301\u3064\u5909\u6570\u306e\u3053\u3068\u3092\u8a00\u3044\u307e\u3059\u3002<\/p>\n<\/div>\n\n\n
ref\/reactive<\/h3>\n\n\n
\u3067\u306f\u307e\u305a\u3001ref<\/code>\u3092vue<\/code>\u304b\u3089\u30a4\u30f3\u30dd\u30fc\u30c8\u3057\u3066\u4f7f\u7528\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002
<\/p>\n\n\n
import { ref } from 'vue';\nconst count = ref(0);\nconst increment = () => count.value++;<\/code><\/pre>\n\n\n
ref<\/code>\u3067\u5b9a\u7fa9\u3057\u305f\u5909\u6570\u306e\u5024\u306f\u3001value<\/code>\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u3088\u3063\u3066\u30a2\u30af\u30bb\u30b9\u304c\u53ef\u80fd\u3067\u3059\u3002\u305d\u306e\u305f\u3081\u3001const increment = () => count++;<\/code>\u306e\u307e\u307e\u3067\u306f\u5909\u6570count<\/code>\u306b\u76f4\u63a5\u30a2\u30af\u30bb\u30b9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u305b\u3093\u3002\u3057\u304b\u3057\u3001<template><\/code>\u5185\u3067\u306fvalue<\/code>\u306e\u8a18\u8ff0\u306f\u4e0d\u8981\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n
<template>\n <div>{{ count }}<\/div>\n<\/template><\/code><\/pre>\n\n\n
\u5909\u6570count<\/code>\u306f\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u306a\u5024\u3067\u3057\u305f\u304c\u3001\u540c\u69d8\u306e\u65b9\u6cd5\u3067\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u30ea\u30a2\u30af\u30c6\u30a3\u30d6\u306b\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n
import { ref } from 'vue';\n\nconst obj = ref({ a: 0, b: 0 });\nconst increment = () => obj.value.a++;\nconst reset = () => obj.value = { a: 0, b: 0 };<\/code><\/pre>\n\n\n
\u3067\u3059\u304c\u3001obj.value.a<\/code>\u3068\u3059\u308b\u306e\u306f\u5c11\u3057\u5197\u9577\u7684\u306b\u601d\u3048\u306a\u304f\u3082\u306a\u3044\u3067\u3059\u3002 
\u305d\u3053\u3067\u767b\u5834\u3059\u308b\u306e\u304creactive<\/code>\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n
import { reactive } from \"vue\";\n\nconst obj = reactive({ a: 0, b: 0 });\nconst increment = () => obj.a++;\nconst reset = () => Object.assign(obj, { a: 0, b: 0 });<\/code><\/pre>\n\n\n
reactive<\/code>\u3067\u3042\u308c\u3070value<\/code>\u3092\u4ed8\u3051\u305a\u306b\u30d7\u30ed\u30d1\u30c6\u30a3\u3078\u306e\u30a2\u30af\u30bb\u30b9\u304c\u53ef\u80fd\u306a\u306e\u3067\u3001\u3088\u308a\u76f4\u611f\u7684\u306b\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u4e8b\u304c\u3067\u304d\u307e\u3059\u3002\u3057\u304b\u3057reactive<\/code>\u306e\u5834\u5408\u306f\u76f4\u63a5\u4ee3\u5165\u304c\u4e0d\u53ef\u80fd\u306a\u306e\u3067\u3001Object.assign()<\/code>\u3092\u4f7f\u7528\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
\u4e00\u822c\u7684\u306a\u4f7f\u3044\u5206\u3051\u3068\u3057\u3066\u3001\u300c\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u306a\u5024\u306fref<\/code>\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306freactive<\/code>\u300d\u3068\u3044\u3046\u5370\u8c61\u304c\u3042\u308a\u307e\u3059\u304c\u3001ref<\/code>\u306fvalue<\/code>\u3092\u3064\u3051\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u4e00\u65b9\u3067\u3001\u4e00\u76ee\u898b\u3066\u30ea\u30a2\u30af\u30c6\u30a3\u30d6\u306a\u5024\u3060\u3068\u5224\u65ad\u3057\u3084\u3059\u3044\u306e\u3067\u3001\u597d\u307f\u306a\u3069\u304c\u306a\u3051\u308c\u3070\u57fa\u672c\u7684\u306b\u306fref<\/code>\u3092\u4f7f\u3046\u3067\u554f\u984c\u306a\u3044\u304b\u3068\u601d\u308f\u308c\u307e\u3059\u3002<\/p>\n\n\n
computed\uff08\u7b97\u51fa\u30d7\u30ed\u30d1\u30c6\u30a3\uff09<\/h3>\n\n\n
computed<\/code><\/span>\u306f\u5024\u306e\u5909\u66f4\u304c\u3042\u308b\u305f\u3073\u306b\u81ea\u52d5\u3067\u51e6\u7406\u3092\u5b9f\u884c\u3057\u3001\u305d\u306e\u7d50\u679c\u30921\u3064\u3060\u3051\u8fd4\u3059\u3068\u3044\u3046\u3082\u306e\u3067\u3059\u3002Options API\u3067\u306fcomputed<\/code><\/span>\u30d7\u30ed\u30d1\u30c6\u30a3\u3068\u3057\u3066\u5b9a\u7fa9\u3057\u3066\u3044\u307e\u3057\u305f\u304c\u3001Composition API\u3067\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n
import { ref, computed } from 'vue';\n\nconst number = ref(1);\nconst doubleNumber = computed(() => number.value * 2);\n\nconst displaNumber = () => {\n  console.log(number.value, doubleNumber.value);\n}<\/code><\/pre>\n\n\n
\u4e0a\u8a18\u306e\u4f8b\u3067\u306f\u3001\u5909\u6570number<\/code>\u3092\u4e8c\u500d\u306b\u3057\u305fdoubleNumber<\/code>\u3092computed<\/code><\/span>\u3067\u5b9a\u7fa9\u3057\u3066\u3044\u307e\u3059\u3002 computed<\/code><\/span>\u306e\u5024\u306fref<\/code>\u3068\u540c\u69d8value<\/code>\u30d7\u30ed\u30d1\u30c6\u30a3\u7d4c\u7531\u3067\u30a2\u30af\u30bb\u30b9\u3057\u307e\u3059\u3002<\/p>\n
\u307e\u305f\u3001computed<\/code><\/span>\u306f\u30c7\u30d5\u30a9\u30eb\u30c8\u3067Getter\u3068\u3057\u3066\u52d5\u4f5c\u3057\u307e\u3059\u304c\u3001Setter\u3082\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u304a\u308a\u3001\u66f8\u304d\u8fbc\u307f\u304c\u53ef\u80fd\u306acomputed<\/code><\/span>\u306e\u3053\u3068\u3092Writable Computed<\/code><\/span>\u3068\u3044\u3044\u307e\u3059\u3002<\/p>\n\n\n
<template>\n  <input type=\"number\" v-model=\"doubleNumber\" \/>\n<\/template>\n\n<script setup>\nimport  { ref, computed } from 'vue'\nconst number = ref(1)\nconst doubleNumber= computed({\n get: () => number.value * 2,\n set: (val) => {\n    number.value = val\n  }\n})\n<\/script><\/code><\/pre>\n\n\n
Writable Computed<\/code><\/span>\u306fv-model<\/code><\/span>\u3092\u4f7f\u7528\u3059\u308b\u969b\u306a\u3069\u306b\u3068\u3066\u3082\u4fbf\u5229\u3067\u3059\u3002\u4e0a\u8a18\u306e\u4f8b\u3067\u306f\u3001input<\/code><\/span>\u306b\u5165\u529b\u3055\u308c\u305f\u6570\u5024\u3092\u81ea\u52d5\u7684\u306b2\u500d\u306b\u3057\u3066\u8fd4\u3059\u51e6\u7406\u3092\u884c\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n
props<\/h3>\n\n\n
props<\/code><\/span>\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u89aa\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304b\u3089\u5b50\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3078\u30c7\u30fc\u30bf\u3092\u6e21\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059<\/span>\u3002\u89aa\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304b\u3089\u30c7\u30fc\u30bf\u3092\u53d7\u3051\u53d6\u308b\u305f\u3081\u306b\u306f\u3001\u5b50\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u5074\u3067defineProps<\/code><\/span>\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n
const props = defineProps<{\n  message: string\n}>();<\/code><\/pre>\n\n\n
\u4e0a\u8a18\u306e\u4f8b\u3067\u306f\u3001message<\/code>\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u30c7\u30fc\u30bf\u578b\u3092string<\/code>\u3068\u3057\u3066\u6307\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002\u53d7\u3051\u53d6\u3063\u305f\u5024\u306fprops.message<\/code>\u306e\u3088\u3046\u306b\u30a2\u30af\u30bb\u30b9\u3057\u307e\u3059\u304c\u3001<template><\/code>\u5185\u3067\u306fprops<\/code><\/span>\u306f\u4e0d\u8981\u3067\u3059\u3002<\/p>\n\n\n
<template>\n <div>{{ message }}<\/div>\n<\/template><\/code><\/pre>\n\n\n
\u7d9a\u3044\u3066\u3001\u89aa\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304b\u3089props<\/code><\/span>\u3092\u6e21\u3059\u306b\u306f\u3001\u5b50\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u547c\u3073\u51fa\u3059\u969b\u306b\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u8a2d\u5b9a\u3057\u307e\u3059\u3002<\/p>\n\n\n
<template>\n  <div>\n    <ChildComponent message=\"Hello world!\" \/>\n  <\/div>\n<\/template>\n\n<script setup>\nimport ChildComponent from '.\/ChildComponent.vue';\n<\/script><\/code><\/pre>\n\n\n
\u3053\u308c\u306b\u3088\u308a\u3001message<\/code>\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\"Hello world!\"<\/code>\u3068\u3044\u3046\u5024\u304c\u6e21\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n
emit<\/h3>\n\n\n
emit<\/code>\u3067\u306f\u3001\u30a4\u30d9\u30f3\u30c8\u3092\u5229\u7528\u3057\u3066\u5b50\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304b\u3089\u89aa\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3078\u901a\u77e5\u3092\u884c\u3044\u3001\u30a4\u30d9\u30f3\u30c8\u3068\u4e00\u7dd2\u306b\u89aa\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306b\u30c7\u30fc\u30bf\u3092\u6e21\u3059\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002\u89aa\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3078\u30a4\u30d9\u30f3\u30c8\u3092\u901a\u77e5\u3059\u308b\u306b\u306f\u3001\u5b50\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u5074\u3067defineEmits<\/code>\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n
<template>\n  <div>\n    <button @click=\"sendMessage\">Send Message!<\/button>\n  <\/div>\n<\/template>\n\n<script setup>\nimport { ref } from 'vue';\n\nconst emit = defineEmits<{\n  (e: 'sendMessage', message: string): void\n}>();\n\nconst message = ref('Hello world!');\nconst sendMessage = () => {\n  emit('sendMessage', message);\n};\n<\/script><\/code><\/pre>\n\n\n
emit<\/code>\u306f2\u3064\u4ee5\u4e0a\u306e\u5f15\u6570\u3092\u53d6\u308b\u305f\u3081\u3001emit<\/code>\u306e\u7b2c\u4e00\u5f15\u6570\u306b\u306f\u30c8\u30ea\u30ac\u30fc\u3057\u305f\u3044\u30a4\u30d9\u30f3\u30c8\u306e\u540d\u524d\u3092\u3001\u7b2c\u4e8c\u5f15\u6570\u4ee5\u964d\u306b\u306f\u89aa\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306b\u6e21\u3057\u305f\u3044\u30c7\u30fc\u30bf\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n
\u307e\u305f\u3001\u89aa\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067\u30c7\u30fc\u30bf\u3092\u53d7\u3051\u53d6\u308b\u969b\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n\n\n
<template>\n  <ChildComponent @sendMessage=\"sendMessage\" \/>\n<\/template>\n\n<script setup>\nimport ChildComponent from '.\/ChildComponent.vue';\n\nconst sendMessage = (message: string) => {\n  console.log(message);\n}\n<\/script><\/code><\/pre>\n\n\n
\u3053\u308c\u306b\u3088\u308a\u3001\u30dc\u30bf\u30f3\u30af\u30ea\u30c3\u30af\u3067sendMessage<\/code>\u3068\u3044\u3046\u30a4\u30d9\u30f3\u30c8\u306e\u901a\u77e5\u3068\u5171\u306bmessage<\/code>\u306e\u5024\u3092\u89aa\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306b\u9001\u4fe1\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n
\u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\u30d5\u30c3\u30af<\/h3>\n\n\n
\u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\u30d5\u30c3\u30af\u3068\u306f\u3001Vue\u3067\u4f5c\u6210\u3057\u305f\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304c\u751f\u6210\u3055\u308c\u3066\u3001\u6d88\u3048\u308b\u307e\u3067\u306e\u72b6\u614b\u9077\u79fb\u306e\u3053\u3068\u3092\u8a00\u3044\u3001Options API\u3068Composition API\u3067\u95a2\u6570\u540d\u304c\u82e5\u5e72\u7570\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n
Options API (vue2)<\/strong><\/td>Composition API (vue3)<\/strong><\/td><\/tr>
beforeCreate<\/td>–<\/td><\/tr>
created<\/td>–<\/td><\/tr>
beforeMount<\/td>onBeforeMount()<\/td><\/tr>
mounted<\/td>onMounted()<\/td><\/tr>
beforeUpdate<\/td>onBeforeUpdate()<\/td><\/tr>
updated<\/td>onUpdated()<\/td><\/tr>
beforeDestroy<\/td>onBeforeUnount()<\/td><\/tr>
destroyed<\/td>onUnmounted()<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n
Composition API\u3067\u306f\u3001<script setup><\/code>\u5185\u306b\u5b9a\u7fa9\u3057\u305f\u3059\u3079\u3066\u306e\u51e6\u7406\u304cbeforeCreate<\/code>\u3068created<\/span><\/code>\u306b\u8a72\u5f53\u3057\u307e\u3059\u3002 \u305d\u306e\u305f\u3081\u3001\u3053\u306e2\u3064\u306f\u95a2\u6570\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u3002<\/p>\n
\u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\u30d5\u30c3\u30af\u3092\u4f7f\u7528\u3059\u308b\u969b\u306fvue<\/code>\u304b\u3089import<\/span><\/code>\u3057\u3066\u4f7f\u3044\u307e\u3059\u3002<\/p>\n\n\n
\u6700\u5f8c\u306b<\/h2>\n\n\n
Composition API\u306e\u57fa\u672c\u306b\u3064\u3044\u3066\u7d39\u4ecb\u3057\u3066\u3044\u304d\u307e\u3057\u305f\u304c\u3001Composition API\u72ec\u81ea\u306e\u6a5f\u80fd\u306f\u307e\u3060\u3044\u304f\u3064\u304b\u3042\u308a\u307e\u3059\u3002\u5404\u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\u30d5\u30c3\u30af\u306e\u8a73\u7d30\u306a\u8aac\u660e\u306a\u3069\u3001\u7701\u7565\u3057\u3066\u3044\u308b\u90e8\u5206\u3082\u7d50\u69cb\u3042\u308b\u306e\u3067\u3001Vue3\u3082\u3068\u3044Composition API\u306b\u8208\u5473\u306e\u3042\u308b\u65b9\u3084\u696d\u52d9\u3067\u4f7f\u7528\u3057\u3066\u3044\u308b\u65b9\u306f\u3001\u305c\u3072\u8272\u3005\u8abf\u3079\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n
Vue.js\u3068\u306f\u3010\u5165\u9580\u3011\u30e1\u30ea\u30c3\u30c8\u30fb\u7279\u5fb4\u6bd4\u8f03\u3067\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac<\/a><\/blockquote>