{"id":1990,"date":"2021-08-25T16:30:17","date_gmt":"2021-08-25T07:30:17","guid":{"rendered":"https:\/\/suzutukiblog.com\/?p=1990"},"modified":"2023-01-06T01:32:41","modified_gmt":"2023-01-05T16:32:41","slug":"javascript4","status":"publish","type":"post","link":"https:\/\/suzutukiblog.com\/index.php\/2021\/08\/25\/javascript4\/","title":{"rendered":"JavaScript\u5b66\u7fd2\u306e\u307e\u3068\u30814(DOM\u57fa\u790e)"},"content":{"rendered":"

3\u304b\u3089\u7d9a\u304d\u307e\u3059<\/a><\/p>\n

1:DOM(Document Object Model)\u3068\u306f\uff1f<\/h3>\n

1:HTML\u3092JavaScript<\/strong>\u304b\u3089\u64cd\u4f5c\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u305f\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9<\/p>\n

2:JavaScript\u304b\u3089\u306fDOM API\u3092\u901a\u3058\u3066HTML\u306e\u60c5\u5831\u3092\u53d6\u5f97\u30fb\u5909\u66f4\u3057\u307e\u3059\u3002<\/strong><\/p>\n

document.querySelector\u3092\u4f7f\u3046\u5834\u5408\u304c\u591a\u3044\u3089\u3057\u3044<\/strong><\/p>\n

3:\u60c5\u5831\u306e\u53d6\u5f97\u30fb\u5909\u66f4\u30fb\u30a4\u30d9\u30f3\u30c8\u306e\u767b\u9332<\/strong>\u306a\u3069\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n

\u4f8b1<\/h3>\n
\n
const ul = document.querySelector('ul')\r\nundefined ul.style.color = 'red' \"red\"\r\nconst firstLi = ul.querySelector('li')\r\nundefined firstLi.style.color = 'black' \"black\"<\/code><\/pre>\n<\/div>\n
<\/h2>\n
1: ul\u8981\u7d20\u3092\u53d6\u5f97<\/h2>\n
2: ul\u306e\u6587\u5b57\u8272\u3092\u3059\u3079\u3066\u8d64\u306b\u3057\u3066<\/h2>\n
3: ul.querySelector(‘li’)\u3067\u521d\u3081\u306eli\u8981\u7d20\u3092\u4ee3\u5165<\/h2>\n
4: \u521d\u3081\u306eli\u8981\u7d20\u306e\u8272\u3092\u9ed2\u306b\u3057\u3066\u3044\u308b<\/h2>\n
\n
const li = document.querySelectorAll('li')\r\n li[0].style.color = 'purple'\r\n li\r\nNodeList(3)\r\n [li.item.item-1, li.item.item-2, li.item.item-3]\r\n li.forEach(node => node.style.color = 'purple');<\/code><\/pre>\n<\/div>\n
1: li\u8981\u7d20\u3092\u3059\u3079\u3066\u53d6\u5f97\u3057\u3066<\/h2>\n
2:\u521d\u3081\u306e\u8981\u7d20\u3092\u30d1\u30fc\u30d7\u30eb\u306b\u3057\u3066<\/h2>\n
3:forEach\u3092\u4f7f\u3063\u3066\u30eb\u30fc\u30d7\u3055\u305b\u3066\u5168\u3066\u306b\u9069\u7528\u3055\u305b\u3066\u3044\u308b\u3002<\/h2>\n
2:\u30dc\u30bf\u30f3\u304c\u62bc\u3055\u308c\u305f\u3068\u304dhello\u3068\u51fa\u529b\u3059\u308b<\/h3>\n
HTML(body\u304b\u3089)\u306e\u8a18\u8ff0<\/h3>\n
\n
<body>\r\n <h1 id=\"main-title\">JavaScript\u306e\u57fa\u790e<\/h1>\r\n <h2 class=\"sub-title\">DOM(Document Object Model)\u306b\r\n\u30a4\u30d9\u30f3\u30c8\u30ea\u30b9\u30ca\u30fc\u3092\u767b\u9332\u3057\u3066\u307f\u3088\u3046\u3002<\/h2>\r\n <button id=\"btn\">Change Title Color<\/button>\r\n <script src=\"main.js\"><\/script>\r\n<\/body><\/code><\/pre>\n<\/div>\n
\n
JavaScript\u306e\u8a18\u8ff0<\/h3>\n
\n
\/\/ \u30dc\u30bf\u30f3\u306e\u8981\u7d20\u3092\u53d6\u5f97\r\nconst btn = document.querySelector('#btn')\r\n; \/\/ \u30dc\u30bf\u30f3\u304c\u62bc\u3055\u308c\u305f\u3068\u304dhello\u3068\u51fa\u529b\u3059\u308b\r\nbtn.addEventListener('click', function() {\r\n\u00a0alert('hello');\r\n\u00a0});\r\n\/\/ \u3053\u3063\u3061\u306e\u66f8\u304d\u65b9\u306e\u307b\u3046\u304cbetter\r\nconst hello = function() { \r\n\u00a0alert('hello');\r\n};\r\n\/\/ \u30af\u30ea\u30c3\u30af\u3057\u305f\u3068\u304d\u306b\u767a\u706b\r\nbtn.addEventListener('click',hello);\r\n\/\/ \u3053\u3061\u3089\u306e\u66f8\u304d\u65b9\u3067\u3082OK\r\n\u00a0function hello() {\r\n\u00a0alert('hello');\r\n};<\/code><\/pre>\n<\/div>\n
\n
\u30dc\u30bf\u30f3\u304c\u62bc\u3055\u308c\u305f\u3068\u304d\u8272\u3092\u5909\u66f4\u3059\u308b<\/h3>\n<\/div>\n
\n
\/\/ \u30dc\u30bf\u30f3\u306e\u8981\u7d20\u3092\u53d6\u5f97\r\nconst btn = document.querySelector('#btn');\r\n  btn.addEventListener('click',hello);\r\nfunctionhello() { \r\n this.style.color = 'red';\r\n console.log(this); \r\n};\r\n\/\/ \u30af\u30ea\u30c3\u30af\u3057\u305f\u3068\u304d\u306b\u767a\u706b\r\nbtn.addEventListener('click', hello);\r\n\/\/ \u30de\u30a6\u30b9\u30aa\u30fc\u30d0\u30fc\u3057\u305f\u3068\u304d\u306b\u767a\u706b\u3059\u308b\u8a18\u8ff0\r\n\/\/ btn.addEventListener('mouseenter',hello);\r\nconst h1 = document.querySelector('h1');\r\n  function changeColor() {\r\n  h1.style.color = 'red';\r\n}\r\nfunction changeBgColor() {\r\n  h1.style.backgroundColor = 'green';\r\n}\r\nfunction helloWorld(){\r\n  alert('HelloWorld'); \r\n}\r\n\/\/ addEventListener\u3092\u4f7f\u3046\u3053\u3068\u3067\u8907\u6570\u306e\u30a4\u30d9\u30f3\u30c8\u3092\u8ffd\u52a0\u3067\u304d\u308b\u3088 \r\nbtn.addEventListener('click', changeColor); \r\nbtn.addEventListener('click', changeBgColor); \r\n\/\/ \u30a4\u30d9\u30f3\u30c8\u30ea\u30b9\u30ca\u30fc\u3092\u524a\u9664\u3059\u308b(\u4e0a\u3092\u6253\u3061\u6d88\u3059) \r\n\/\/ btn.removeEventListener('click', changeBgColor);<\/code><\/pre>\n<\/div>\n<\/div>\n
\n
\n
\u30dc\u30bf\u30f3\u3092\u62bc\u3059\u524d<\/h3>\n
\"\"<\/p>\n
\u30dc\u30bf\u30f3\u3092\u62bc\u3057\u305f\u5f8c<\/h3>\n
\"\"\u00a0<\/strong><\/p>\n<\/div>\n
\u30c6\u30ad\u30b9\u30c8\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u306b\u7d9a\u304f<\/a><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
3\u304b\u3089\u7d9a\u304d\u307e\u3059 1:DOM(Document Object Model)\u3068\u306f\uff1f 1:HTML\u3092JavaScript\u304b\u3089\u64cd\u4f5c\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u305f\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9 2:JavaScript\u304b\u3089\u306fDOM API\u3092\u901a\u3058\u3066HTML\u306e\u60c5 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[17,27],"tags":[],"class_list":["post-1990","post","type-post","status-publish","format-standard","hentry","category-javascript","category-programming-note"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/suzutukiblog.com\/index.php\/wp-json\/wp\/v2\/posts\/1990","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/suzutukiblog.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/suzutukiblog.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/suzutukiblog.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/suzutukiblog.com\/index.php\/wp-json\/wp\/v2\/comments?post=1990"}],"version-history":[{"count":31,"href":"https:\/\/suzutukiblog.com\/index.php\/wp-json\/wp\/v2\/posts\/1990\/revisions"}],"predecessor-version":[{"id":7279,"href":"https:\/\/suzutukiblog.com\/index.php\/wp-json\/wp\/v2\/posts\/1990\/revisions\/7279"}],"wp:attachment":[{"href":"https:\/\/suzutukiblog.com\/index.php\/wp-json\/wp\/v2\/media?parent=1990"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/suzutukiblog.com\/index.php\/wp-json\/wp\/v2\/categories?post=1990"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/suzutukiblog.com\/index.php\/wp-json\/wp\/v2\/tags?post=1990"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}