{"id":2997,"date":"2018-05-24T20:18:55","date_gmt":"2018-05-24T11:18:55","guid":{"rendered":"http:\/\/taitan916.info\/blog\/?p=2997"},"modified":"2024-03-13T23:07:35","modified_gmt":"2024-03-13T14:07:35","slug":"post-2997","status":"publish","type":"post","link":"https:\/\/taitan916.info\/blog\/archives\/2997","title":{"rendered":"JavaScript\u3067\u5c0f\u6570\u306e\u8a08\u7b97\u3092\u3059\u308b\u969b\u306b\u305a\u308c(\u8aa4\u5dee)\u3092\u7121\u304f\u3059\u65b9\u6cd5(decimal.js)"},"content":{"rendered":"<p>JavaScript\u3067\u5c0f\u6570\u306e\u8a08\u7b97\u3092\u3059\u308b\u3068\u5024\u304c\u305a\u308c\u308b(\u8aa4\u5dee\u304c\u767a\u751f\u3059\u308b)\u3053\u3068\u304c\u3042\u3063\u305f\u3002\u8abf\u3079\u3066\u307f\u308b\u3068JavaScript\u306f<a href=\"https:\/\/ja.wikipedia.org\/wiki\/IEEE_754\" target=\"_blank\" rel=\"noopener\">IEEE754<\/a>\u3068\u304b\u3044\u3046\u898f\u683c\u306b\u305d\u3063\u3066\u5b9f\u88c5\u3055\u308c\u3066\u304a\u308a\u3001\u305d\u306e\u305b\u3044\u3067\u8aa4\u5dee\u304c\u751f\u307e\u308c\u308b\u3089\u3057\u3044\u3002\u81ea\u4f5c\u95a2\u6570\u3068\u304b\u3067\u4f55\u3068\u304b\u3059\u308b\u65b9\u6cd5\u3068\u30e9\u30a4\u30d6\u30e9\u30ea\u3067\u5bfe\u5fdc\u3059\u308b\u65b9\u6cd5\u304c\u3042\u308a\u3001\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u65b9\u304c\u697d\u305d\u3046\u3060\u3063\u305f\u306e\u3067\u4f7f\u7528\u65b9\u6cd5\u306e\u30e1\u30e2\u3002<\/p>\n<p>&nbsp;<\/p>\n<h2>\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u7528\u610f<\/h2>\n<h3>\u81ea\u30b5\u30fc\u30d0\u306b\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3059\u308b\u5834\u5408<\/h3>\n<p>\u4ee5\u4e0b\u304b\u3089decimal.js\u3092\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3057\u3001\u9069\u5f53\u306a\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306b\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3059\u308b\u3002<\/p>\n<p><a href=\"https:\/\/github.com\/MikeMcl\/decimal.js\/\" target=\"_blank\" rel=\"noopener\">https:\/\/github.com\/MikeMcl\/decimal.js\/<\/a><\/p>\n<h3>CDN\u3067\u5229\u7528\u3059\u308b\u5834\u5408<\/h3>\n<p>\u4ee5\u4e0b\u3092\u8a18\u8ff0\u3059\u308b\u3002<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">&lt;script src=\"https:\/\/cdnjs.cloudflare.com\/ajax\/libs\/decimal.js\/9.0.0\/decimal.min.js\"&gt;&lt;\/script&gt;<\/pre>\n<p>\u30d0\u30fc\u30b8\u30e7\u30f3\u3092\u5909\u66f4\u3057\u305f\u3044\u5834\u5408\u306f\u4ee5\u4e0b\u304b\u3089\u63a2\u3059\u3002<\/p>\n<p><a href=\"https:\/\/cdnjs.com\/libraries\/decimal.js\/9.0.0\" target=\"_blank\" rel=\"noopener\">https:\/\/cdnjs.com\/libraries\/decimal.js\/9.0.0<\/a><\/p>\n<h3>\u30ea\u30d5\u30a1\u30ec\u30f3\u30b9<\/h3>\n<p><a href=\"https:\/\/mikemcl.github.io\/decimal.js\/\" target=\"_blank\" rel=\"noopener\">https:\/\/mikemcl.github.io\/decimal.js\/<\/a><\/p>\n<p>&nbsp;<\/p>\n<h2>\u4f7f\u3044\u65b9<\/h2>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">let dec = new Decimal(0.001);\r\n\r\n\/\/\u8db3\u3057\u7b97\r\ndec = dec.plus(0.001);\r\n\r\n\/\/\u5f15\u304d\u7b97\r\ndec = dec.minus(0.001);\r\n\r\n\/\/\u639b\u3051\u7b97\r\ndec = dec.times(0.001);\r\n\r\n\/\/\u5272\u308a\u7b97\r\ndec = dec.div(0.001);\r\n\r\n\/\/\u6570\u5024\u5316\r\nconst num = dec.toNumber();\r\n\r\n\/\/\u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u307f\u305f\u3044\u306b\u3082\u4f7f\u3048\u308b\r\nconsole.log(dec.times(0.01).toNumber());<\/pre>\n<p><strong>toNumber()\u3067\u6570\u5024\u5316\u3057\u306a\u3044\u3068\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u8fd4\u3063\u3066\u304f\u308b<\/strong>\u306e\u3067\u6ce8\u610f\u3059\u308b\u3002<\/p>\n<p>&nbsp;<\/p>\n<h2>\u30bd\u30fc\u30b9<\/h2>\n<h3>\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9<\/h3>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">&lt;script&gt;\r\nconst a = 0.01;\r\nconst b = 0.0001;\r\nconsole.log(a * b); \/\/0.0000010000000000000002\u304c\u8868\u793a\u3055\u308c\u308b\r\n\r\nconst dec = new Decimal(a);\r\nconsole.log(dec.times(b).toNumber()); \/\/0.000001\u304c\u8868\u793a\u3055\u308c\u308b\r\n&lt;\/script&gt;<\/pre>\n<h3>\u6d88\u8cbb\u7a0e\u306e\u8a08\u7b97\u30b5\u30f3\u30d7\u30eb<\/h3>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">&lt;script&gt;\r\nconst tax = 1.1;\r\nconst price = 1650;\r\nconst total_price = tax * price;\r\nconsole.log(total_price); \/\/1815.0000000000002\u304c\u8868\u793a\u3055\u308c\u308b\r\n\r\nconst tax = new Decimal(1.1);\r\nconst price = 1650;\r\nconst total_price = tax.times(price).toNumber();\r\nconsole.log(total_price); \/\/1815\u304c\u8868\u793a\u3055\u308c\u308b\r\n&lt;\/script&gt;<\/pre>\n<p>&nbsp;<\/p>\n<h2>\u53c2\u8003\u30b5\u30a4\u30c8<\/h2>\n<p><a href=\"http:\/\/laxmi759.blog.fc2.com\/blog-entry-92.html\" target=\"_blank\" rel=\"noopener\">http:\/\/laxmi759.blog.fc2.com\/blog-entry-92.html<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>JavaScript\u3067\u5c0f\u6570\u306e\u8a08\u7b97\u3092\u3059\u308b\u3068\u5024\u304c\u305a\u308c\u308b(\u8aa4\u5dee\u304c\u767a\u751f\u3059\u308b)\u3053\u3068\u304c\u3042\u3063\u305f ... <\/p>\n","protected":false},"author":1,"featured_media":1067,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[4],"tags":[100],"class_list":["post-2997","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-javascript","tag-library"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" 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