{"id":2975,"date":"2020-04-26T14:51:15","date_gmt":"2020-04-26T05:51:15","guid":{"rendered":"https:\/\/naoya-ono.com\/blog\/?p=2975"},"modified":"2020-04-26T14:51:15","modified_gmt":"2020-04-26T05:51:15","slug":"js-math-round","status":"publish","type":"post","link":"https:\/\/naoya-ono.com\/blog\/js-math-round\/","title":{"rendered":"\u3010JavaScript\u3011\u56db\u6368\u4e94\u5165\u3059\u308b\u65b9\u6cd5\uff01\u6841\u6307\u5b9a\u306e\u3084\u308a\u65b9\u3082\u89e3\u8aac"},"content":{"rendered":"<p>\u3053\u306e\u30da\u30fc\u30b8\u3067\u306f\u3001JavaScript\u3092\u4f7f\u3063\u3066\u56db\u6368\u4e94\u5165\u3059\u308b\u65b9\u6cd5\u3084\u6841\u306e\u5207\u308a\u6368\u3066\u3001\u5207\u308a\u4e0a\u3052\u306e\u65b9\u6cd5\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<div id=\"toc_container\" class=\"no_bullets\"><p class=\"toc_title\">\u76ee\u6b21<\/p><ul class=\"toc_list\"><li><a href=\"#i\">\u56db\u6368\u4e94\u5165\u306e\u3084\u308a\u65b9\uff08\u6841\u6307\u5b9a\u306a\u3057\uff09<\/a><\/li><li><a href=\"#i-2\">\u56db\u6368\u4e94\u5165\u306e\u3084\u308a\u65b9\uff08\u6841\u6307\u5b9a\u3042\u308a\uff09<\/a><\/li><li><a href=\"#i-3\">\u6841\u3092\u5207\u308a\u6368\u3066\u305f\u3044\u5834\u5408\u306f\uff1f<\/a><\/li><\/ul><\/div>\n<h2 class=\"hh hh5 pastel-bc\" id=\"i-0\"><span id=\"i\">\u56db\u6368\u4e94\u5165\u306e\u3084\u308a\u65b9\uff08\u6841\u6307\u5b9a\u306a\u3057\uff09<\/span><\/h2>\n<p>\u56db\u6368\u4e94\u5165\u306e\u65b9\u6cd5\u306fJS\u5074\u306bMath.round()\u3068\u3044\u3046\u30e1\u30bd\u30c3\u30c9\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u3001\u3053\u308c\u3092\u4f7f\u3048\u3070\u7c21\u5358\u306b\u884c\u3048\u307e\u3059\u3002<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>\/\/ \u66f8\u304d\u65b9\nMath.round(\u6570\u5024); \n\n\/\/ \u4f8b \nMath.round(5.6); \u3000\u3000\/\/ \u7d50\u679c\uff1a6 \nMath.round(5.4); \u3000\u3000\/\/ \u7d50\u679c\uff1a5<\/code><\/pre>\n<\/div>\n<p>\u305f\u3060\u3057\u3001\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u304c\u3001\u5c0f\u6570\u70b9\u304c\u300c0.5\u4ee5\u4e0a\u300d\u304b\u300c0.5\u300d\u672a\u6e80\u304b\u3067\u5224\u65ad\u3059\u308b\u305f\u3081\u7d50\u679c\u306f\u5fc5\u305a\u6574\u6570\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u306a\u306e\u3067\u3001\u5c0f\u6570\u70b9\u7b2c\uff11\u4f4d\u307e\u3067\u6b8b\u3057\u305f\u3044\u3068\u3044\u3063\u305f\u3084\u308a\u65b9\u306f\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n<h2 class=\"hh hh5 pastel-bc\" id=\"i-1\"><span id=\"i-2\">\u56db\u6368\u4e94\u5165\u306e\u3084\u308a\u65b9\uff08\u6841\u6307\u5b9a\u3042\u308a\uff09<\/span><\/h2>\n<p>Math.round()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066\u3001\u6841\u3092\u6307\u5b9a\u3057\u305f\u3044\u5834\u5408\u306f\u6b21\u306e\u3088\u3046\u306b\u66f8\u304d\u307e\u3059\u3002<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>\/\/ \u5c0f\u6570\u70b9\u7b2c1\u4f4d\u307e\u3067\u6b8b\u3059\nMath.round(\u6570\u5024 * 10) \/ 10; \n\n\/\/ \u5c11\u6570\u70b9\u7b2c2\u4f4d\u307e\u3067\u6b8b\u3059 \nMath.round(\u6570\u5024 * 10) \/ 10; \n\n\/\/ \u4f8b \nMath.round(12.567 * 10) \/ 10;   \/\/ \u7d50\u679c\uff1a12.6 \nMath.round(12.567 * 100) \/ 100;   \/\/ \u7d50\u679c\uff1a12.57<\/code><\/pre>\n<\/div>\n<p>\u306a\u305c\u3001\u3053\u3046\u306a\u308b\u306e\u304b\u3067\u3059\u304c\u3001\u8a08\u7b97\u306e\u6d41\u308c\u3092\u8ffd\u3063\u3066\u307f\u308b\u3068\u308f\u304b\u308a\u3084\u3059\u3044\u3067\u3059\u3002<\/p>\n<p>Math.round(12.567 * 10) \/ 10\u306e\u5834\u5408\u3001\u307e\u305a\u300c12.567 * 10\u300d\u3067\u300c125.67\u300d\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u305d\u3057\u3066\u3001Math.round()\u30e1\u30bd\u30c3\u30c9\u306f\u6570\u5024\u304c0.5\u4ee5\u4e0a\u3067\u3042\u308c\u3070\u56db\u6368\u4e94\u5165\u3092\u884c\u3044\u307e\u3059\u304b\u3089\u3001\u300c126\u300d\u306b\u306a\u308a\u307e\u3059\u306d\u3002<\/p>\n<p>\u6700\u5f8c\u306b\u3053\u308c\u3092\u300c10\u300d\u3067\u5272\u308b\u3053\u3068\u3067\u3001\u300c12.6\u300d\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/naoya-ono.com\/blog\/wp-content\/uploads\/2020\/04\/\u56db\u6368\u4e94\u5165\u6d41\u308c-1024x682.jpg\" alt=\"\" width=\"880\" height=\"586\" class=\"wp-image-2977 size-large aligncenter img_border\" srcset=\"https:\/\/naoya-ono.com\/blog\/wp-content\/uploads\/2020\/04\/\u56db\u6368\u4e94\u5165\u6d41\u308c-1024x682.jpg 1024w, https:\/\/naoya-ono.com\/blog\/wp-content\/uploads\/2020\/04\/\u56db\u6368\u4e94\u5165\u6d41\u308c-300x200.jpg 300w, https:\/\/naoya-ono.com\/blog\/wp-content\/uploads\/2020\/04\/\u56db\u6368\u4e94\u5165\u6d41\u308c-768x512.jpg 768w, https:\/\/naoya-ono.com\/blog\/wp-content\/uploads\/2020\/04\/\u56db\u6368\u4e94\u5165\u6d41\u308c-940x626.jpg 940w, https:\/\/naoya-ono.com\/blog\/wp-content\/uploads\/2020\/04\/\u56db\u6368\u4e94\u5165\u6d41\u308c.jpg 1280w\" sizes=\"(max-width: 880px) 100vw, 880px\"><br \/>\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script><br \/>\n<ins class=\"adsbygoogle\" style=\"display: block; text-align: center;\" data-ad-layout=\"in-article\" data-ad-format=\"fluid\" data-ad-client=\"ca-pub-4166043434922569\" data-ad-slot=\"7750996733\"><\/ins><br \/>\n<script>\n     (adsbygoogle = window.adsbygoogle || []).push({});\n<\/script><\/p>\n<h2 class=\"hh hh5 pastel-bc\" id=\"i-2\"><span id=\"i-3\">\u6841\u3092\u5207\u308a\u6368\u3066\u305f\u3044\u5834\u5408\u306f\uff1f<\/span><\/h2>\n<p>\u56db\u6368\u4e94\u5165\u3067\u306f\u306a\u304f\u3001\u5c0f\u6570\u70b9\u3092\u5207\u308a\u6368\u3066\u305f\u3044\u5834\u5408\u306f\u3001Math.floor()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3044\u307e\u3059\u3002<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>\/\/ \u66f8\u304d\u65b9\nMath.floor(\u6570\u5024); \n\n\/\/ \u4f8b \nMath.floor(5.6);  \/\/ \u7d50\u679c\uff1a5 \nMath.floor(5.4);  \/\/ \u7d50\u679c\uff1a5<\/code><\/pre>\n<\/div>\n<p>\u6841\u3092\u5207\u308a\u4e0a\u3052\u305f\u3044\u5834\u5408\u306f\uff1f<\/p>\n<p>\u56db\u6368\u4e94\u5165\u3067\u306f\u306a\u304f\u3001\u5c0f\u6570\u70b9\u304c\u3042\u308b\u5834\u5408\u306b\u6841\u3092\u5207\u308a\u4e0a\u3052\u305f\u3044\u5834\u5408\u306f\u3001Math.ceil()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3044\u307e\u3059\u3002<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code><span>\/\/ \u66f8\u304d\u65b9\nMath.ceil(\u6570\u5024);<\/span>\n\n\/\/ \u4f8b\n<span>Math.ceil(5.6);  \/\/ \u7d50\u679c\uff1a6<\/span>\n<span>Math.ceil(5.4);  \/\/ \u7d50\u679c\uff1a6<\/span><\/code><\/pre>\n<\/div>\n<p><span class=\"labeltext accent-bc\">JavaScript\u306e\u304a\u3059\u3059\u3081\u66f8\u7c4d<\/span><\/p>\n<div id=\"rinkerid2978\" class=\"yyi-rinker-contents  yyi-rinker-postid-2978 yyi-rinker-img-m yyi-rinker-catid-18 yyi-rinker-catid-3 \">\n<div class=\"yyi-rinker-box\">\n<div class=\"yyi-rinker-image\">\n\t\t\t\t\t\t\t<a href=\"https:\/\/www.amazon.co.jp\/dp\/477418411X?tag=naoya-ono-22&amp;linkCode=ogi&amp;th=1&amp;psc=1\" rel=\"nofollow\" class=\"yyi-rinker-tracking\" data-click-tracking=\"amazon_img 2978 \u6539\u8a02\u65b0\u7248JavaScript\u672c\u683c\u5165\u9580 ~\u30e2\u30c0\u30f3\u30b9\u30bf\u30a4\u30eb\u306b\u3088\u308b\u57fa\u790e\u304b\u3089\u73fe\u5834\u3067\u306e\u5fdc\u7528\u307e\u3067\" data-vars-click-id=\"amazon_img 2978 \u6539\u8a02\u65b0\u7248JavaScript\u672c\u683c\u5165\u9580 ~\u30e2\u30c0\u30f3\u30b9\u30bf\u30a4\u30eb\u306b\u3088\u308b\u57fa\u790e\u304b\u3089\u73fe\u5834\u3067\u306e\u5fdc\u7528\u307e\u3067\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/m.media-amazon.com\/images\/I\/51AvRbVdAsL._SL160_.jpg\" width=\"126\" height=\"160\" class=\"yyi-rinker-main-img\" style=\"border: none;\"><\/a>\t\t\t\t\t<\/div>\n<div class=\"yyi-rinker-info\">\n<div class=\"yyi-rinker-title\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/www.amazon.co.jp\/dp\/477418411X?tag=naoya-ono-22&amp;linkCode=ogi&amp;th=1&amp;psc=1\" rel=\"nofollow\" class=\"yyi-rinker-tracking\" data-click-tracking=\"amazon_title 2978 \u6539\u8a02\u65b0\u7248JavaScript\u672c\u683c\u5165\u9580 ~\u30e2\u30c0\u30f3\u30b9\u30bf\u30a4\u30eb\u306b\u3088\u308b\u57fa\u790e\u304b\u3089\u73fe\u5834\u3067\u306e\u5fdc\u7528\u307e\u3067\" data-vars-amp-click-id=\"amazon_title 2978 \u6539\u8a02\u65b0\u7248JavaScript\u672c\u683c\u5165\u9580 ~\u30e2\u30c0\u30f3\u30b9\u30bf\u30a4\u30eb\u306b\u3088\u308b\u57fa\u790e\u304b\u3089\u73fe\u5834\u3067\u306e\u5fdc\u7528\u307e\u3067\">\u6539\u8a02\u65b0\u7248JavaScript\u672c\u683c\u5165\u9580 ~\u30e2\u30c0\u30f3\u30b9\u30bf\u30a4\u30eb\u306b\u3088\u308b\u57fa\u790e\u304b\u3089\u73fe\u5834\u3067\u306e\u5fdc\u7528\u307e\u3067<\/a>\t\t\t\t\t\t\t<\/div>\n<div class=\"yyi-rinker-detail\">\n<div class=\"credit-box\">created by&nbsp;<a href=\"https:\/\/oyakosodate.com\/rinker\/\" rel=\"nofollow noopener\" target=\"_blank\">Rinker<\/a><\/div>\n<div class=\"price-box\">\n\t\t\t\t\t\t\t<\/div>\n<\/p><\/div>\n<ul class=\"yyi-rinker-links\">\n<li class=\"amazonkindlelink\">\n\t\t\t\t\t\t<a href=\"https:\/\/www.amazon.co.jp\/gp\/product\/B01LYO6C1N\/ref=as_li_qf_asin_il_tl?ie=UTF8&amp;tag=naoya-ono-22&amp;creative=1211&amp;linkCode=as2&amp;creativeASIN=B01LYO6C1N&amp;linkId=33e7d02fb1f92c79b9155f056680d84b\" rel=\"nofollow\" class=\"yyi-rinker-link yyi-rinker-tracking\" data-click-tracking=\"amazon_kindle 2978 \u6539\u8a02\u65b0\u7248JavaScript\u672c\u683c\u5165\u9580 ~\u30e2\u30c0\u30f3\u30b9\u30bf\u30a4\u30eb\u306b\u3088\u308b\u57fa\u790e\u304b\u3089\u73fe\u5834\u3067\u306e\u5fdc\u7528\u307e\u3067\" data-vars-amp-click-id=\"amazon_kindle 2978 \u6539\u8a02\u65b0\u7248JavaScript\u672c\u683c\u5165\u9580 ~\u30e2\u30c0\u30f3\u30b9\u30bf\u30a4\u30eb\u306b\u3088\u308b\u57fa\u790e\u304b\u3089\u73fe\u5834\u3067\u306e\u5fdc\u7528\u307e\u3067\">Kindle<\/a>\t\t\t\t\t<\/li>\n<li class=\"amazonlink\">\n\t\t\t\t\t\t<a href=\"https:\/\/www.amazon.co.jp\/dp\/477418411X?tag=naoya-ono-22&amp;linkCode=ogi&amp;th=1&amp;psc=1\" rel=\"nofollow\" class=\"yyi-rinker-link yyi-rinker-tracking\" data-click-tracking=\"amazon 2978 \u6539\u8a02\u65b0\u7248JavaScript\u672c\u683c\u5165\u9580 ~\u30e2\u30c0\u30f3\u30b9\u30bf\u30a4\u30eb\u306b\u3088\u308b\u57fa\u790e\u304b\u3089\u73fe\u5834\u3067\u306e\u5fdc\u7528\u307e\u3067\" data-vars-amp-click-id=\"amazon 2978 \u6539\u8a02\u65b0\u7248JavaScript\u672c\u683c\u5165\u9580 ~\u30e2\u30c0\u30f3\u30b9\u30bf\u30a4\u30eb\u306b\u3088\u308b\u57fa\u790e\u304b\u3089\u73fe\u5834\u3067\u306e\u5fdc\u7528\u307e\u3067\">Amazon<\/a>\t\t\t\t\t<\/li>\n<li class=\"rakutenlink\">\n\t\t\t\t\t\t<a href=\"https:\/\/hb.afl.rakuten.co.jp\/hgc\/16781883.64066d33.16781884.4f333982\/Rinker_o_20200426144523?pc=https%3A%2F%2Fsearch.rakuten.co.jp%2Fsearch%2Fmall%2Fjavascript%2B%25E6%259C%25AC%25E6%25A0%25BC%25E5%2585%25A5%25E9%2596%2580%2F%3Ff%3D1%26grp%3Dproduct&amp;m=https%3A%2F%2Fsearch.rakuten.co.jp%2Fsearch%2Fmall%2Fjavascript%2B%25E6%259C%25AC%25E6%25A0%25BC%25E5%2585%25A5%25E9%2596%2580%2F%3Ff%3D1%26grp%3Dproduct\" rel=\"nofollow\" class=\"yyi-rinker-link yyi-rinker-tracking\" data-click-tracking=\"rakuten 2978 \u6539\u8a02\u65b0\u7248JavaScript\u672c\u683c\u5165\u9580 ~\u30e2\u30c0\u30f3\u30b9\u30bf\u30a4\u30eb\u306b\u3088\u308b\u57fa\u790e\u304b\u3089\u73fe\u5834\u3067\u306e\u5fdc\u7528\u307e\u3067\" data-vars-amp-click-id=\"rakuten 2978 \u6539\u8a02\u65b0\u7248JavaScript\u672c\u683c\u5165\u9580 ~\u30e2\u30c0\u30f3\u30b9\u30bf\u30a4\u30eb\u306b\u3088\u308b\u57fa\u790e\u304b\u3089\u73fe\u5834\u3067\u306e\u5fdc\u7528\u307e\u3067\">\u697d\u5929\u5e02\u5834<\/a>\t\t\t\t\t<\/li>\n<li class=\"yahoolink\">\n\t\t\t\t\t\t<a href=\"https:\/\/shopping.yahoo.co.jp\/search?p=javascript+%E6%9C%AC%E6%A0%BC%E5%85%A5%E9%96%80\" rel=\"nofollow\" class=\"yyi-rinker-link yyi-rinker-tracking\" data-click-tracking=\"yahoo 2978 \u6539\u8a02\u65b0\u7248JavaScript\u672c\u683c\u5165\u9580 ~\u30e2\u30c0\u30f3\u30b9\u30bf\u30a4\u30eb\u306b\u3088\u308b\u57fa\u790e\u304b\u3089\u73fe\u5834\u3067\u306e\u5fdc\u7528\u307e\u3067\" data-vars-amp-click-id=\"yahoo 2978 \u6539\u8a02\u65b0\u7248JavaScript\u672c\u683c\u5165\u9580 ~\u30e2\u30c0\u30f3\u30b9\u30bf\u30a4\u30eb\u306b\u3088\u308b\u57fa\u790e\u304b\u3089\u73fe\u5834\u3067\u306e\u5fdc\u7528\u307e\u3067\">Yahoo\u30b7\u30e7\u30c3\u30d4\u30f3\u30b0<\/a>\t\t\t\t\t<\/li>\n<\/ul><\/div>\n<\/p><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u3053\u306e\u30da\u30fc\u30b8\u3067\u306f\u3001JavaScript\u3092\u4f7f\u3063\u3066\u56db\u6368\u4e94\u5165\u3059\u308b\u65b9\u6cd5\u3084\u6841\u306e\u5207\u308a\u6368\u3066\u3001\u5207\u308a\u4e0a\u3052\u306e\u65b9\u6cd5\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002 \u76ee\u6b21\u56db\u6368\u4e94\u5165\u306e\u3084\u308a\u65b9\uff08\u6841\u6307\u5b9a\u306a\u3057\uff09\u56db\u6368\u4e94\u5165\u306e\u3084\u308a\u65b9\uff08\u6841\u6307\u5b9a\u3042\u308a\uff09\u6841\u3092\u5207\u308a\u6368\u3066\u305f\u3044\u5834\u5408\u306f\uff1f \u56db\u6368\u4e94\u5165\u306e\u3084\u308a &#8230; <\/p>\n","protected":false},"author":1,"featured_media":2976,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18,3],"tags":[],"_links":{"self":[{"href":"https:\/\/naoya-ono.com\/blog\/wp-json\/wp\/v2\/posts\/2975"}],"collection":[{"href":"https:\/\/naoya-ono.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/naoya-ono.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/naoya-ono.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/naoya-ono.com\/blog\/wp-json\/wp\/v2\/comments?post=2975"}],"version-history":[{"count":4,"href":"https:\/\/naoya-ono.com\/blog\/wp-json\/wp\/v2\/posts\/2975\/revisions"}],"predecessor-version":[{"id":2982,"href":"https:\/\/naoya-ono.com\/blog\/wp-json\/wp\/v2\/posts\/2975\/revisions\/2982"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/naoya-ono.com\/blog\/wp-json\/wp\/v2\/media\/2976"}],"wp:attachment":[{"href":"https:\/\/naoya-ono.com\/blog\/wp-json\/wp\/v2\/media?parent=2975"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/naoya-ono.com\/blog\/wp-json\/wp\/v2\/categories?post=2975"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/naoya-ono.com\/blog\/wp-json\/wp\/v2\/tags?post=2975"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}