{"id":106695,"date":"2019-08-20T16:42:11","date_gmt":"2019-08-20T07:42:11","guid":{"rendered":"https:\/\/www.sejuku.net\/blog\/?p=106695"},"modified":"2024-05-06T11:55:49","modified_gmt":"2024-05-06T02:55:49","slug":"%e5%88%9d%e5%bf%83%e8%80%85%e3%81%8c%e7%9f%a5%e3%81%a3%e3%81%a6%e3%81%8a%e3%81%8f%e3%81%b9%e3%81%8djavascript%e3%83%86%e3%82%af%e3%83%8b%e3%83%83%e3%82%af%e5%8e%b3%e9%81%b8%e3%83%af%e3%82%b6","status":"publish","type":"post","link":"https:\/\/www.sejuku.net\/blog\/106695","title":{"rendered":"\u521d\u5fc3\u8005\u304c\u77e5\u3063\u3066\u304a\u304f\u3079\u304dJavaScript\u30c6\u30af\u30cb\u30c3\u30af\u53b3\u9078\u30ef\u30b6"},"content":{"rendered":"


\n\u3082\u3063\u3068JavaScript\u3092\u52b9\u7387\u3088\u304f\u8a18\u8ff0\u3067\u304d\u306a\u3044\u304b\u306a\u2026
\n\u7c21\u6f54\u30fb\u7c21\u7565\u7684\u306b\u30d7\u30ed\u30b0\u30e9\u30e0\u3059\u308b\u624b\u6cd5\u304c\u77e5\u308a\u305f\u3044
\n\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3092\u5206\u304b\u308a\u3084\u3059\u304f\u66f8\u304f\u65b9\u6cd5\u304c\u3088\u304f\u5206\u304b\u3089\u306a\u3044
\n<\/b><\/div><\/p>\n

JavaScript\u306f\u3001\u4ed6\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3068\u6bd4\u8f03\u3057\u3066\u3082\u304b\u306a\u308a\u81ea\u7531\u5ea6\u304c\u9ad8\u304f\u3001\u4eba\u306b\u3088\u3063\u3066\u66f8\u304d\u65b9\u304c\u7570\u306a\u308b\u3053\u3068\u304c\u591a\u3044\u306e\u3082\u7279\u5fb4\u3067\u3057\u3087\u3046\u3002<\/p>\n

\u3053\u306e\u3088\u3046\u306a\u80cc\u666f\u304b\u3089\u3001JavaScript\u306b\u306f\u3055\u307e\u3056\u307e\u306a\u66f8\u304d\u65b9\u304c\u5b58\u5728\u3057\u3066\u3044\u307e\u3059\u3002\u306a\u304b\u3067\u3082\u3001\u77e5\u3089\u306a\u3044\u3068\u640d\u3059\u308b\u30ec\u30d9\u30eb\u306e\u52b9\u7387\u7684\u306a\u66f8\u304d\u65b9\u304b\u3089\u3001\u8ab0\u304c\u898b\u3066\u3082\u5206\u304b\u308a\u3084\u3059\u3044\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u624b\u6cd5\u3082\u304b\u306a\u308a\u5b58\u5728\u3057\u307e\u3059\u3002<\/p>\n

\u3053\u306e\u3088\u3046\u306a\u77e5\u8b58\u306f\u66f8\u7c4d\u304b\u3089\u3067\u306f\u306a\u304b\u306a\u304b\u5b66\u7fd2\u3057\u306b\u304f\u3044\u3068\u3044\u3046\u306e\u304c\u5927\u304d\u306a\u7279\u5fb4\u3067\u3059\u3002<\/p>\n

\u305d\u3053\u3067\u3001\u3053\u306e\u8a18\u4e8b\u3067\u306f\u521d\u5fc3\u8005\u3067\u3082\u4eca\u65e5\u304b\u3089JavaScript\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u30c6\u30af\u30cb\u30c3\u30af\u3092\u5b66\u7fd2\u3059\u308b\u305f\u3081\u306e\u65b9\u6cd5\u306b\u3064\u3044\u3066\u5206\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u306e\u3067\u3001\u305c\u3072\u6700\u5f8c\u307e\u3067\u8aad\u3093\u3067\u7406\u89e3\u3092\u6df1\u3081\u3066\u9802\u3051\u308c\u3070\u5e78\u3044\u3067\u3059\u3002<\/p>\n

\u4e00\u4eba\u3067\u3082\u591a\u304f\u306e\u65b9\u304cJavaScript\u306e\u4e0d\u5b89\u3092\u89e3\u6d88\u3067\u304d\u308c\u3070\u5e78\u3044\u3067\u3059\u3002<\/p>\n

\u57fa\u672c\u30c6\u30af\u30cb\u30c3\u30af<\/h2>\n

\u3053\u306e\u7ae0\u3067\u306f\u3001\u57fa\u672c\u7684\u306a\u69cb\u6587\u3092\u4f7f\u3063\u305f\u52b9\u7387\u306e\u826f\u3044\u66f8\u304d\u65b9\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002\u4e3b\u306b\u3001\u6570\u5024\u3092\u4f7f\u3063\u305f\u8a08\u7b97\u51e6\u7406\u3068\u914d\u5217\u306b\u95a2\u3059\u308b\u5185\u5bb9\u3092\u5b66\u3093\u3067\u3044\u304d\u307e\u3059\u3002<\/p>\n

\u6570\u5024\u6f14\u7b97\u306e\u52b9\u7387\u5316<\/h3>\n

JavaScript\u3067\u6570\u5024\u3092\u6271\u3046\u6642\u306b\u3001\u899a\u3048\u3066\u304a\u304f\u3068\u4fbf\u5229\u306a\u66f8\u304d\u65b9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u306a\u304b\u3067\u3082\u7279\u306b\u4fbf\u5229\u306a\u3010\u6307\u6570\u3011\u3068\u3010\u30d3\u30c3\u30c8\u6f14\u7b97\u3011\u306b\u3064\u3044\u3066\u3054\u7d39\u4ecb\u3057\u3066\u304a\u304d\u307e\u3059\uff01<\/p>\n

\u307e\u305a\u6307\u6570\u3067\u3059\u304c\u3001\u3053\u308c\u306f\u6570\u5b66\u3067\u52c9\u5f37\u3057\u305f\u5185\u5bb9\u3068\u540c\u3058\u30670\u306e\u6570<\/b>\u3092\u8a18\u8ff0\u3057\u307e\u3059\u3002\u4f8b\u3048\u3070\u30011000\u3068\u3044\u3046\u6570\u5024\u304c\u3042\u308c\u30700\u306f3\u3064\u306a\u306e\u3067\u30101e3\u3011\u3068\u8868\u73fe\u3059\u308b\u308f\u3051\u3067\u3059\u3002\u3053\u308c\u3092JavaScript\u3067\u30d7\u30ed\u30b0\u30e9\u30e0\u3059\u308b\u3068\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n

\r\nconst num1 = 100000;\r\nconst num2 = 1e5;\r\n  \r\nconsole.log(num1);\r\nconsole.log(num2);\r\n<\/pre>\n
\u5b9f\u884c\u7d50\u679c<\/p>\n
\r\n100000\r\n\r\n100000\r\n<\/pre>\n
\u5909\u6570num2\u304c\u6307\u6570\u3092\u5229\u7528\u3057\u305f\u6570\u5024\u306b\u306a\u308a\u307e\u3059\u3002\u5b9f\u884c\u7d50\u679c\u3092\u898b\u308b\u3068\u6307\u6570\u3092\u4f7f\u3063\u3066\u3044\u306a\u3044\u5909\u6570\u3068\u540c\u3058\u6570\u5024\u306b\u306a\u3063\u3066\u3044\u308b\u3053\u3068\u304c\u78ba\u8a8d\u3067\u304d\u307e\u3059\u306d\u3002<\/p>\n
\u6307\u6570\u306f\u5c11\u6570\u5024\u3092\u8868\u73fe\u3057\u305f\u308a\u3001\u305d\u306e\u307e\u307e\u8a08\u7b97\u51e6\u7406\u306b\u5229\u7528\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n
\r\nconst num = 1e-3;\r\n  \r\nconsole.log(num);\r\nconsole.log(num * 5);\r\n<\/pre>\n
\u5b9f\u884c\u7d50\u679c<\/p>\n
\r\n0.001\r\n\r\n0.005\r\n<\/pre>\n
\u5909\u6570num\u306f\u30101e-3\u3011\u3068\u8a18\u8ff0\u3057\u3066\u3044\u308b\u306e\u3067\u3001\u3053\u308c\u306f\u5c0f\u6570\u70b9\u4ee5\u4e0b3\u6841\u3092\u610f\u5473\u3057\u3066\u3044\u308b\u308f\u3051\u3067\u3059\u3002<\/p>\n
\u6b21\u306b\u3010\u30d3\u30c3\u30c8\u6f14\u7b97\u3011\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
\u3053\u308c\u306f\u4e3b\u306b\u5c0f\u6570\u70b9\u4ee5\u4e0b\u3092\u5207\u308a\u6368\u3066\u308b\u3088\u3046\u306a\u30b1\u30fc\u30b9\u3067\u4fbf\u5229\u306b\u5229\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u4e00\u822c\u7684\u306a\u5c0f\u6570\u70b9\u5207\u308a\u6368\u3066\u306fMath.floor()\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u304c\u591a\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n
\r\nconst num = 1.2345;\r\n\r\nconsole.log(Math.floor(num));\r\n<\/pre>\n
\u5b9f\u884c\u7d50\u679c<\/p>\n
\r\n1\r\n<\/pre>\n
\u30d3\u30c3\u30c8\u6f14\u7b97\u306f\u3010| , >> , ~~\u3011\u306a\u3069\u3092\u5229\u7528\u3057\u3066\u7c21\u5358\u306b\u5c0f\u6570\u70b9\u306e\u5207\u308a\u6368\u3066\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\r\nconst num = 1.2345;\r\n\r\nconsole.log(num|0);\r\nconsole.log(num>>0);\r\nconsole.log(~~num);\r\n<\/pre>\n
\u5b9f\u884c\u7d50\u679c<\/p>\n
\r\n1\r\n1\r\n1\r\n<\/pre>\n
\u3010~~\u3011\u306f\u5909\u6570\u306e\u524d\u306b\u4ed8\u4e0e\u3059\u308b\u3053\u3068\u3067\u30d3\u30c3\u30c8\u30b7\u30d5\u30c8\u3092\u5b9f\u884c\u3067\u304d\u308b\u306e\u3067\u3059\u304c\u3001\u3053\u308c\u30922\u56de\u884c\u3046\u3053\u3068\u3067\u6570\u5024\u306b\u5909\u5316\u306f\u3042\u308a\u307e\u305b\u3093\u304c32\u30d3\u30c3\u30c8\u578b\u306b\u5909\u63db\u3055\u308c\u308b<\/b>\u306e\u3067\u81ea\u52d5\u7684\u306b\u5c0f\u6570\u70b9\u306f\u6392\u9664\u3055\u308c\u308b\u3068\u3044\u3046\u4ed5\u69d8\u3092\u3046\u307e\u304f\u5229\u7528\u3057\u305f\u65b9\u6cd5\u3068\u8a00\u3048\u307e\u3059\u3002<\/p>\n
\u3010|, >>\u3011\u3082\u540c\u69d8\u306b32\u30d3\u30c3\u30c8\u578b\u306b\u5909\u63db\u3055\u308c\u308b\u306e\u3067\u3059\u304c\u3001\u3053\u3061\u3089\u306f0\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3067\u6570\u5024\u306b\u5909\u5316\u304c\u8d77\u304d\u306a\u3044\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u914d\u5217\u30e1\u30bd\u30c3\u30c9\u306e\u6d3b\u7528<\/h3>\n
JavaScript\u3067\u914d\u5217\u3092\u6271\u3046\u6642\u306bforEach\u306f\u3082\u3063\u3068\u3082\u3088\u304f\u4f7f\u308f\u308c\u308b\u30e1\u30bd\u30c3\u30c9\u3067\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n
forEach\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u5229\u7528\u3059\u308c\u3070\u3001\u305f\u3044\u3066\u3044\u306e\u914d\u5217\u51e6\u7406\u306f\u884c\u3048\u308b\u306e\u3067\u3059\u304c\u591a\u7528\u306f\u7981\u7269\u3067\u3059\u3002\u30dd\u30a4\u30f3\u30c8\u306f\u7528\u9014\u306b\u5408\u308f\u305b\u3066\u6700\u9069\u306a\u914d\u5217\u30e1\u30bd\u30c3\u30c9\u3092\u5229\u7528\u3059\u308b\u3068\u3044\u3046\u70b9\u306b\u3042\u308a\u307e\u3059\u3002<\/p>\n
\u4f8b\u3048\u3070\u3001\u6b21\u306e\u4f8b\u306f\u914d\u5217\u306e\u4e2d\u8eab\u3092\u3059\u3079\u3066\u30b3\u30f3\u30bd\u30fc\u30eb\u30ed\u30b0\u3078\u51fa\u529b\u3059\u308b\u3068\u3044\u3046\u3082\u306e\u3067\u3059\u3002<\/p>\n
\r\nconst list = [5,45,255,500];\r\n  \r\nlist.forEach(data => {\r\n    console.log(data);\r\n})\r\n<\/pre>\n
\u5b9f\u884c\u7d50\u679c<\/p>\n
\r\n5\r\n45\r\n255\r\n500\r\n<\/pre>\n
\u3053\u308c\u3060\u3051\u306e\u51e6\u7406\u3067\u3042\u308c\u3070forEach\u3092\u5229\u7528\u3057\u3066\u3082\u554f\u984c\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n
\u6b21\u306b\u3001\u914d\u5217\u306e\u8981\u7d20\u304b\u3089\u6761\u4ef6\u306b\u5408\u3063\u305f\u3082\u306e\u3060\u3051\u3092\u62bd\u51fa\u3059\u308b<\/b>\u3088\u3046\u306a\u30b1\u30fc\u30b9\u3067\u306ffilter\u30e1\u30bd\u30c3\u30c9\u3092\u5229\u7528\u3057\u307e\u3059\u3002<\/p>\n
\r\nconst list = [5,45,255,500];\r\n  \r\nconst result = list.filter(data => {\r\n  if(data>300) return true;\r\n})\r\n  \r\nconsole.log(result);\r\n<\/pre>\n
\u5b9f\u884c\u7d50\u679c<\/p>\n
\r\n[500]\r\n<\/pre>\n
\u3053\u306e\u4f8b\u3067\u306f\u3001\u914d\u5217\u306b\u683c\u7d0d\u3055\u308c\u3066\u3044\u308b\u6570\u5024\u304c300\u4ee5\u4e0a\u306e\u3082\u306e\u3060\u3051\u3092\u62bd\u51fa\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u3082\u3061\u308d\u3093forEach\u3067\u3082\u540c\u3058\u3088\u3046\u306a\u51e6\u7406\u306f\u53ef\u80fd\u3067\u3059\u304c\u3001\u30b3\u30fc\u30c9\u3092\u898b\u305f\u3068\u304d\u306b\u306f\u3063\u304d\u308a\u3068\u6761\u4ef6\u62bd\u51fa\u3057\u3066\u3044\u308b\u51e6\u7406\u3060\u3068\u5206\u304b\u308b\u306e\u306ffilter\u30e1\u30bd\u30c3\u30c9\u3092\u5229\u7528\u3057\u3066\u3044\u308b\u30e1\u30ea\u30c3\u30c8\u3067\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n
\u305d\u308c\u3067\u306f\u3001\u6b21\u306e\u30b5\u30f3\u30d7\u30eb\u4f8b\u3067\u306f\u3069\u3046\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n
\r\nconst list = [5,45,255,500];\r\n  \r\nconst result = list.map(data => {\r\n  return data * 2;\r\n})\r\n  \r\nconsole.log(result);\r\n<\/pre>\n
\u5b9f\u884c\u7d50\u679c<\/p>\n
\r\n[10, 90, 510, 1000]\r\n<\/pre>\n
\u3053\u306e\u4f8b\u3067\u306f\u3001\u914d\u5217\u8981\u7d20\u3092\u305d\u308c\u305e\u308c2\u500d\u306b\u3057\u305f\u65b0\u3057\u3044\u914d\u5217<\/b>\u3092\u751f\u6210\u3057\u3066\u3044\u307e\u3059\u3002map\u3092\u4f7f\u3046\u3053\u3068\u3067\u4f55\u304b\u65b0\u3057\u3044\u914d\u5217\u3092\u751f\u6210\u3057\u3066\u3044\u308b\u3053\u3068\u304c\u660e\u78ba\u306b\u306a\u308b\u308f\u3051\u3067\u3059\u3002<\/p>\n
\u3053\u306e\u3088\u3046\u306b\u3059\u3079\u3066forEach\u3067\u51e6\u7406\u3092\u884c\u3046\u3088\u308a\u3082\u3001\u7528\u9014\u306b\u3042\u3063\u305f\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3044\u5206\u3051\u308b\u65b9\u304c\u3042\u3068\u304b\u3089\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3092\u8aad\u3080\u3068\u304d\u306b\u7406\u89e3\u3057\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n
DOM\u64cd\u4f5c<\/h2>\n
\u3053\u306e\u7ae0\u3067\u306f\u3001JavaScript\u3067DOM\u64cd\u4f5c\u3092\u884c\u3046\u6642\u306b\u77e5\u3063\u3066\u304a\u304f\u3068\u826f\u3044\u30dd\u30a4\u30f3\u30c8\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002\u4e3b\u306b\u3001ID\u5c5e\u6027\u5024\u306e\u53d6\u5f97\u6cd5\u3068window\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u3064\u3044\u3066\u5b66\u3093\u3067\u3044\u304d\u307e\u3059\u3002<\/p>\n
ID\u5c5e\u6027\u5024\u306e\u53d6\u5f97\u65b9\u6cd5\u306b\u3064\u3044\u3066<\/h3>\n
JavaScript\u3067HTML\u8981\u7d20\u3092\u53d6\u5f97\u3059\u308b\u6642\u306e\u7c21\u7565\u7684\u306a\u66f8\u304d\u65b9\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n
\u4f8b\u3048\u3070\u3001\u6b21\u306e\u3088\u3046\u306aHTML\u8981\u7d20\u304c\u3042\u308b\u3068\u3057\u307e\u3059\u3002<\/p>\n
\r\n
\u30b5\u30f3\u30d7\u30eb\u30c6\u30ad\u30b9\u30c8<\/h1>\r\n<\/pre>\n
\u666e\u901a\u306a\u3089getElementById()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066\u3001HTML\u8981\u7d20\u306b\u4ed8\u4e0e\u3055\u308c\u3066\u3044\u308bID\u5c5e\u6027\u5024\u304b\u3089\u53d6\u5f97\u3057\u307e\u3059\u3002<\/p>\n
\r\nconst h1 = document.getElementById('text');\r\n  \r\nh1.textContent = '\u3053\u3093\u306b\u3061\u306f';\r\n<\/pre>\n
\u3053\u306e\u4f8b\u3067\u306f\u3001ID\u5c5e\u6027\u5024text\u3092\u5229\u7528\u3057\u3066HTML\u8981\u7d20\u3092\u53d6\u5f97\u3057\u3001\u30c6\u30ad\u30b9\u30c8\u3092\u4efb\u610f\u306e\u6587\u5b57\u5217\u306b\u66f4\u65b0\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u3057\u304b\u3057\u3001ID\u5c5e\u6027\u5024\u3068\u3044\u3046\u306e\u306f1\u3064\u306eHTML\u30d5\u30a1\u30a4\u30eb\u306b1\u3064\u3060\u3051\u306e\u56fa\u6709\u540d\u79f0\u3067\u3042\u308b\u306e\u3068\u3001\u30b0\u30ed\u30fc\u30d0\u30eb\u306a\u6271\u3044\u306b\u306a\u308b\u305f\u3081\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u76f4\u63a5\u6307\u5b9a\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n
\r\ntext.textContent = '\u3053\u3093\u306b\u3061\u306f';\r\n<\/pre>\n
\u3053\u306e\u4f8b\u3067\u306f\u3001ID\u5c5e\u6027\u5024text\u3092\u305d\u306e\u307e\u307e\u6307\u5b9a\u3057\u3066textContent()\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u884c\u3057\u3066\u3044\u307e\u3059\u304c\u3001\u7279\u306b\u30a8\u30e9\u30fc\u3082\u306a\u304f\u52d5\u4f5c\u3057\u307e\u3059<\/p>\n
\u305f\u3060\u3057\u3001\u30d6\u30e9\u30a6\u30b6\u306b\u3088\u3063\u3066\u306f\uff08\u53e4\u3044IE\u306a\u3069\uff09\u6319\u52d5\u304c\u7570\u306a\u308b\u5834\u5408\u3082\u3042\u308b\u306e\u3067\u3001\u672c\u756a\u904b\u7528\u306a\u3069\u306b\u306f\u5411\u3044\u3066\u3044\u306a\u3044\u70b9\u306f\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
Window\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u6d3b\u7528<\/h3>\n
JavaScript\u3067\u306f\u3001\u30d6\u30e9\u30a6\u30b6\u306e\u6a19\u6e96\u3067\u63d0\u4f9b\u3055\u308c\u3066\u3044\u308bwindow\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u76f4\u63a5\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b\u3068\u3044\u3046\u5229\u70b9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
\u3053\u306ewindow\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u306f\u3055\u307e\u3056\u307e\u306a\u30d7\u30ed\u30d1\u30c6\u30a3\u3084\u30e1\u30bd\u30c3\u30c9\u304c\u63d0\u4f9b\u3055\u308c\u3066\u304a\u308a\u3001\u4e00\u822c\u7684\u306b\u3088\u304f\u4f7f\u308f\u308c\u308b\u3082\u306e\u3092\u4ee5\u4e0b\u306b\u63b2\u8f09\u3057\u3066\u304a\u304d\u307e\u3059\u3002<\/p>\n
\u3010\u30d7\u30ed\u30d1\u30c6\u30a3\u3011
\n\n\n\n\n\t\n\n\t\n\t\n\t\n\t\n\t\n\t\n\t
\u30d7\u30ed\u30d1\u30c6\u30a3<\/th>\u5185\u5bb9<\/th>\n<\/tr>\n<\/thead>\n
console<\/td>\u30c7\u30d0\u30c3\u30b0\u306a\u3069\u306b\u4fbf\u5229\u306aConsole\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3078\u306e\u30a2\u30af\u30bb\u30b9<\/td>\n<\/tr>\n
history<\/td>\u30d6\u30e9\u30a6\u30b6\u5c65\u6b74\u60c5\u5831\u3078\u306e\u30a2\u30af\u30bb\u30b9<\/td>\n<\/tr>\n
innerHeight<\/td>\u30d6\u30e9\u30a6\u30b6\u30a6\u30a3\u30f3\u30c9\u30a6\u306e\u9ad8\u3055\u3092\u53d6\u5f97<\/td>\n<\/tr>\n
innerWidth<\/td>\u30d6\u30e9\u30a6\u30b6\u30a6\u30a3\u30f3\u30c9\u30a6\u306e\u5e45\u3092\u53d6\u5f97<\/td>\n<\/tr>\n
location<\/td>\u8868\u793a\u3055\u308c\u3066\u3044\u308bWeb\u30da\u30fc\u30b8\u306eURL\u60c5\u5831\u3092\u53d6\u5f97<\/td>\n<\/tr>\n
localStorage<\/td>\u30d6\u30e9\u30a6\u30b6\u306e\u30ed\u30fc\u30ab\u30eb\u30b9\u30c8\u30ec\u30fc\u30b8\u3078\u306e\u30a2\u30af\u30bb\u30b9<\/td>\n<\/tr>\n
navigator<\/td>\u30d6\u30e9\u30a6\u30b6\u74b0\u5883\u306e\u60c5\u5831\u306b\u30a2\u30af\u30bb\u30b9<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/p>\n
\u3010\u30e1\u30bd\u30c3\u30c9\u3011
\n\n\n\n\n\t\n\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t
\u30e1\u30bd\u30c3\u30c9\u540d<\/th>\u5185\u5bb9<\/th>\n<\/tr>\n<\/thead>\n
alert()<\/td>\u8b66\u544a\u30c0\u30a4\u30a2\u30ed\u30b0\u3092\u8868\u793a<\/td>\n<\/tr>\n
back()<\/td>\u30d6\u30e9\u30a6\u30b6\u306e\u5c65\u6b74\u30921\u3064\u524d\u306b\u623b\u308b<\/td>\n<\/tr>\n
close()<\/td>\u73fe\u5728\u306e\u30d6\u30e9\u30a6\u30b6\u30a6\u30a3\u30f3\u30c9\u30a6\u3092\u9589\u3058\u308b<\/td>\n<\/tr>\n
getSelection()<\/td>\u9078\u629e\u3055\u308c\u305f\u8981\u7d20\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u8fd4\u3059<\/td>\n<\/tr>\n
open()<\/td>\u65b0\u3057\u3044\u30d6\u30e9\u30a6\u30b6\u30a6\u30a3\u30f3\u30c9\u30a6\u3092\u958b\u304f<\/td>\n<\/tr>\n
requestAnimationFrame()<\/td>\u30d6\u30e9\u30a6\u30b6\u306e\u74b0\u5883\u306b\u5fdc\u3058\u305f\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u63cf\u753b\u3092\u5b9f\u884c<\/td>\n<\/tr>\n
scroll()<\/td>\u4efb\u610f\u306e\u8981\u7d20\u306b\u30b9\u30af\u30ed\u30fc\u30eb\u3059\u308b<\/td>\n<\/tr>\n
scrollBy()<\/td>\u4efb\u610f\u306e\u8ddd\u96e2\u3060\u3051\u30b9\u30af\u30ed\u30fc\u30eb\u3059\u308b<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/p>\n
\u4f8b\u3048\u3070\u3001\u73fe\u5728\u306e\u30d6\u30e9\u30a6\u30b6\u30a6\u30a3\u30f3\u30c9\u30a6\u306e\u5e45\u3068\u9ad8\u3055\u3092\u53d6\u5f97\u3057\u305f\u3044\u5834\u5408\u306f\u6b21\u306e\u3088\u3046\u306b\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n
\r\nconst w = window.innerWidth;\r\nconst h = window.innerHeight;\r\n<\/pre>\n
\u307e\u305f\u3001\u4efb\u610f\u306e\u30c6\u30ad\u30b9\u30c8\u90e8\u5206\u3092\u30de\u30a6\u30b9\u3067\u30c9\u30e9\u30c3\u30b0\u3057\u305f\u7b87\u6240\u3092\u53d6\u5f97\u3059\u308b\u306b\u306f\u6b21\u306e\u3088\u3046\u306b\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n
\r\nbtn.addEventListener('click', () => {\r\n\r\n    console.log(window.getSelection().toString());\r\n\r\n});\r\n<\/pre>\n
getSelection()\u30e1\u30bd\u30c3\u30c9\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u9078\u629e\u7bc4\u56f2\u3057\u305f\u6587\u5b57\u5217\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u308f\u3051\u3067\u3059\u3002<\/p>\n
\u3053\u306e\u3088\u3046\u306a\u4fbf\u5229\u306a\u30d7\u30ed\u30d1\u30c6\u30a3\u3084\u30e1\u30bd\u30c3\u30c9\u304c\u6a19\u6e96\u3067\u63d0\u4f9b\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u3001window\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u305c\u3072\u6d3b\u7528\u3059\u308b\u3053\u3068\u3092\u30aa\u30b9\u30b9\u30e1\u3057\u307e\u3059\u3002<\/p>\n
\u5909\u6570\u30fb\u95a2\u6570\u306e\u6d3b\u7528<\/h2>\n
\u3053\u306e\u7ae0\u3067\u306f\u3001\u5909\u6570\u3084\u95a2\u6570\u3092\u5229\u7528\u3057\u3066\u30b3\u30fc\u30c9\u3092\u5206\u304b\u308a\u3084\u3059\u304f\u3059\u308b\u624b\u6cd5\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002\u4e3b\u306b\u3001\u8907\u6570\u30e1\u30bd\u30c3\u30c9\u3084\u8a08\u7b97\u5f0f\u306a\u3069\u3092\u5206\u304b\u308a\u3084\u3059\u304f\u3059\u308b\u3053\u3068\u3092\u5b66\u3093\u3067\u3044\u304d\u307e\u3059\u3002<\/p>\n
\u8907\u6570\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u5909\u6570\u306b\u7f6e\u304d\u63db\u3048\u308b<\/h3>\n
IF\u6587\u306a\u3069\u3067\u6761\u4ef6\u5f0f\u3092\u8a18\u8ff0\u3059\u308b\u3068\u304d\u306b\u3001\u3064\u3044\u8907\u6570\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u5229\u7528\u3057\u3066\u5224\u65ad\u3055\u305b\u3088\u3046\u3068\u3044\u3046\u30b1\u30fc\u30b9\u304c\u5c11\u306a\u304f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n
\u4f8b\u3048\u3070\u3001\u6b21\u306e\u3088\u3046\u306a\u30b1\u30fc\u30b9\u3092\u898b\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
\r\nconst arr1 = [2,5,3,7];\r\nconst arr2 = [2,6,4,3];\r\n  \r\nif(arr1.indexOf(3) !== -1 && arr2.indexOf(3) !== -1) {\r\n  console.log(true);\r\n} else {\r\n  console.log(false);\r\n}\r\n<\/pre>\n
\u3053\u306e\u4f8b\u3067\u306f\u3001\u8907\u6570\u306e\u914d\u5217\u8981\u7d20\u306e\u4e2d\u306b\u76ee\u7684\u306e\u5024\u304c\u5b58\u5728\u3059\u308b\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
indexOf()\u3092\u5229\u7528\u3057\u3066true \/ false\u3092\u5224\u5b9a\u3057\u3066\u3044\u308b\u308f\u3051\u3067\u3059\u304c\u3001\u5224\u5b9a\u3059\u308b\u914d\u5217\u304c\u3055\u3089\u306b\u5897\u3048\u308b\u3068\u6761\u4ef6\u5f0f\u306f\u3055\u3089\u306b\u9577\u304f\u306a\u3063\u3066\u3057\u307e\u3063\u3066\u7406\u89e3\u3057\u3065\u3089\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u3053\u306e\u3088\u3046\u306a\u5834\u5408\u306f\u3001\u4e8b\u524d\u306b\u5909\u6570\u3078\u6761\u4ef6\u3092\u683c\u7d0d\u3057\u3066\u3057\u307e\u3046<\/b>\u306e\u304c\u30d9\u30b9\u30c8\u3067\u3057\u3087\u3046\u3002<\/p>\n
\u6b21\u306e\u30b5\u30f3\u30d7\u30eb\u4f8b\u3092\u898b\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
\r\nconst exists = arr1.indexOf(3) !== -1 && arr2.indexOf(3) !== -1;\r\n\r\nif(exists) {\r\n  console.log(true);\r\n} else {\r\n  console.log(false);\r\n}\r\n<\/pre>\n
\u3053\u306e\u4f8b\u3067\u306f\u3001\u5909\u6570exists\u306b\u914d\u5217\u8981\u7d20\u306e\u5b58\u5728\u30c1\u30a7\u30c3\u30af\u3092\u683c\u7d0d\u3057\u3066\u3044\u307e\u3059\u3002\u305d\u3057\u3066\u3001\u3053\u306e\u5909\u6570\u3092IF\u6587\u306e\u6761\u4ef6\u5f0f\u306b\u5229\u7528\u3059\u308b\u3053\u3068\u3067\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u304c\u5168\u4f53\u7684\u306b\u7406\u89e3\u3057\u3084\u3059\u304f\u306a\u308b\u308f\u3051\u3067\u3059\u3002<\/p>\n
\u3082\u3061\u308d\u3093\u3053\u306e\u6642\u306b\u4f5c\u6210\u3059\u308b\u5909\u6570\u540d\u306f\u5206\u304b\u308a\u3084\u3059\u3044\u540d\u79f0\u304c\u597d\u307e\u3057\u3044\u3067\u3057\u3087\u3046\u3002
\n\uff08exists = \u5b58\u5728\u30c1\u30a7\u30c3\u30af\uff09<\/p>\n
\u8a08\u7b97\u5f0f\u3092\u95a2\u6570\u306b\u7f6e\u304d\u63db\u3048\u308b<\/h3>\n
\u6b21\u306b\u8a08\u7b97\u5f0f\u3092\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u4e2d\u306b\u633f\u5165\u3059\u308b\u6642\u306e\u30dd\u30a4\u30f3\u30c8\u306b\u3064\u3044\u3066\u5b66\u3093\u3067\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n
\u4f8b\u3048\u3070\u3001\u6b21\u306e\u3088\u3046\u306a\u8a08\u7b97\u5f0f\u3092\u5909\u6570x\u306b\u683c\u7d0d\u3059\u308b\u5834\u5408\u3092\u898b\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
\r\nconst arr = [223,51,332,70];\r\n\r\nconst x = ( arr[0] * 10 ) \/ 100;\r\n<\/pre>\n
\u3053\u306e\u8a08\u7b97\u5f0f\u3092\u30d1\u30c3\u3068\u898b\u3066\u3001\u4f55\u3092\u3057\u3066\u3044\u308b\u306e\u304b\u3092\u5206\u304b\u308b\u4eba\u306f\u5c11\u306a\u3044\u306f\u305a\u3067\u3059\u3002<\/p>\n
\u3053\u306e\u3088\u3046\u306a\u5834\u5408\u306f\u3001\u5c11\u3057\u30b3\u30fc\u30c9\u304c\u5897\u3048\u307e\u3059\u304c\u95a2\u6570\u306b\u53ce\u3081\u308b\u3053\u3068<\/b>\u3067\u7406\u89e3\u3057\u3084\u3059\u3044\u30b3\u30fc\u30c9\u306b\u5909\u5316\u3057\u307e\u3059\u3002<\/p>\n
\r\nconst arr = [223,51,332,70];\r\n  \r\nconst x = elementWidth(arr[0]);\r\n  \r\n\r\nfunction elementWidth(value) {\r\n  return ( value * 5) \/ 100;\r\n}\r\n<\/pre>\n
\u5148\u307b\u3069\u306e\u8a08\u7b97\u5f0f\u3092\u95a2\u6570elementWidth()\u306b\u305d\u306e\u307e\u307e\u53ce\u3081\u3066\u3044\u307e\u3059\u306d\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u95a2\u6570\u540d\u3092\u8aad\u3080\u3060\u3051\u3067\u4f55\u3089\u304b\u306eHTML\u8981\u7d20\u306e\u5e45\u3092\u6c42\u3081\u3066\u3044\u308b\u306e\u304b\u306a\uff1f\u2026\u3068\u3044\u3046\u306e\u304c\u7406\u89e3\u3067\u304d\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n
\u5185\u5bb9\u306f\u540c\u3058\u306a\u306e\u3067\u3059\u304c\u3001\u3061\u3087\u3063\u3068\u3057\u305f\u5de5\u592b\u3092\u65bd\u3059\u3060\u3051\u3067\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u306f\u8ab0\u304c\u898b\u3066\u3082\u5206\u304b\u308a\u3084\u3059\u3044\u3082\u306e\u306b\u306a\u308b\u3068\u3044\u3046\u308f\u3051\u3067\u3059\u3002<\/p>\n
\u307e\u3068\u3081<\/h2>\n
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