{"id":2461,"date":"2016-11-24T02:54:17","date_gmt":"2016-11-23T17:54:17","guid":{"rendered":"http:\/\/stuffy.dip.jp\/wordpress\/?p=2461"},"modified":"2017-05-29T16:15:40","modified_gmt":"2017-05-29T07:15:40","slug":"value-conversion","status":"publish","type":"post","link":"https:\/\/www.stuffy.site\/wordpress\/?p=2461","title":{"rendered":"\u5024\u306e\u5909\u63db"},"content":{"rendered":"<p>JavaScript \u3067\u306f\u3001Number()\u3067\u6570\u5024\u4ee5\u5916\u306e\u6587\u5b57\u5217\u3092\u6570\u5024\u306b\u5909\u63db\u3057\u3088\u3046\u3068\u3059\u308b\u3068\u3001\u95a2\u6570\u306fNaN\u3092\u8fd4\u3057\u307e\u3059\u3002NaN\u3092typeof\u6f14\u7b97\u5b50\u3067\u5224\u5b9a\u3057\u3088\u3046\u3068\u3057\u3066\u3082&#8217;number&#8217;\u3068\u5224\u5b9a\u3055\u308c\u3066\u4e0a\u624b\u304f\u884c\u304d\u307e\u305b\u3093\u3002\u30c6\u30ad\u30b9\u30c8\u30dc\u30c3\u30af\u30b9\u304b\u3089\u5165\u529b\u3055\u308c\u305f\u5024\u3092getElementById\u3067\u53d7\u3051\u53d6\u308b\u3068\u304d\u306b\u3001\u6570\u5024\u304b\u6587\u5b57\u5217\u304b\u3092\u5224\u5b9a\u3059\u308b\u306b\u306f isFinite\u95a2\u6570\u3092\u4f7f\u3063\u3066<\/p>\n<pre class=\"brush: actionscript3; gutter: false; first-line: 1\">if (isFinite(arg)) {\r\n\u00a0 (\u51e6\u7406)\r\n}\r\nelse {\r\n  alert('\u534a\u89d2\u6570\u5024\u3092\u5165\u529b\u3057\u3066\u304f\u3060\u3055\u3044\uff01');\r\n  return false;\r\n}<\/pre>\n<p>\u3068\u4f8b\u5916\u51e6\u7406\u3057\u307e\u3059\u3002<\/p>\n<table style=\"font-size: 9pt;\">\n<tbody>\n<tr>\n<td nowrap=\"nowrap\">\u5024<\/td>\n<td colspan=\"4\">\u5909\u63db\u5148<\/td>\n<\/tr>\n<tr>\n<td nowrap=\"nowrap\"><\/td>\n<td>\u6587\u5b57\u5217<\/td>\n<td>\u6570\u5024<\/td>\n<td>\u8ad6\u7406\u5024<\/td>\n<td nowrap=\"nowrap\">\u30aa\u30d6\u30b8\u30a7\u30af\u30c8<\/td>\n<\/tr>\n<tr>\n<td>undifined<br \/>\nnull<\/td>\n<td>&#8220;undifined&#8221;<br \/>\n&#8220;null&#8221;<\/td>\n<td>NaN<br \/>\n0<\/td>\n<td>false<br \/>\nfalse<\/td>\n<td>TypeError \u4f8b\u5916<br \/>\nTypeError \u4f8b\u5916<\/td>\n<\/tr>\n<tr>\n<td>true<br \/>\nfalse<\/td>\n<td>&#8220;true&#8221;<br \/>\n&#8220;false&#8221;<\/td>\n<td>1<br \/>\n0<\/td>\n<td><\/td>\n<td>new Boolean(true)<br \/>\nnew Boolean(false)<\/td>\n<\/tr>\n<tr>\n<td>&#8220;&#8221;(\u7a7a\u6587\u5b57\u5217)<br \/>\n&#8220;1.2&#8221;(\u6570\u5024\u6587\u5b57\u5217)<br \/>\n&#8220;one&#8221;<br \/>\n(\u6570\u5024\u4ee5\u5916\u306e\u6587\u5b57\u5217)<\/td>\n<td><\/td>\n<td>0<br \/>\n1.2<br \/>\nNaN<\/td>\n<td>false<br \/>\ntrue<br \/>\ntrue<\/td>\n<td>new String(&#8220;&#8221;)<br \/>\nnew String(&#8220;1.2&#8221;)<br \/>\nnew String(&#8220;one&#8221;)<\/td>\n<\/tr>\n<tr>\n<td>0<br \/>\n-0<br \/>\nNaN<br \/>\nInfinity<br \/>\n-Infinity<br \/>\n1(\u6709\u9650\u5024, 0\u4ee5\u5916)<\/td>\n<td>&#8220;0&#8221;<br \/>\n&#8220;0&#8221;<br \/>\n&#8220;NaN&#8221;<br \/>\n&#8220;Infinity&#8221;<br \/>\n&#8220;-Infinity&#8221;<br \/>\n&#8220;1&#8221;<\/td>\n<td><\/td>\n<td>false<br \/>\nfalse<br \/>\nfalse<br \/>\ntrue<br \/>\ntrue<br \/>\ntrue<\/td>\n<td>new Number(0)<br \/>\nnew Number(-0)<br \/>\nnew Number(NaN)<br \/>\nnew Number(Infinity)<br \/>\nnew Number(-Infinity)<br \/>\nnew Number(1)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u8ffd\u8a18\uff09JavaScript Good Parts \u300c\u826f\u3044\u30d1\u30fc\u30c4\u306b\u3088\u308b\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u300d\u306b\u8208\u5473\u6df1\u3044\u8a18\u8ff0\u304c\u3042\u308a\u307e\u3057\u305f\u306e\u3067\u8ee2\u8f09\u3057\u307e\u3059\u3002<br \/>\n<em><span style=\"font-family: mincho; font-size: 11pt;\">JavaScript \u306f\u3001isNaN \u95a2\u6570\u3092\u63d0\u4f9b\u3057\u3066\u304a\u308a\u3001\u3053\u308c\u3092\u4f7f\u3048\u3070\u6570\u5024\u3068NaN \u3092\u533a\u5225\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/span><\/em><\/p>\n<p>isNaN(NaN)\u3000\u3000\/\/ true<br \/>\nisNaN(0)\u3000\u3000\u3000 \/\/ false<br \/>\nisNaN(&#8216;oops&#8217;)\u3000 \/\/ true<br \/>\nisNaN(&#8216;0&#8217;)\u3000\u3000\u3000\/\/ false<\/p>\n<p><em><span style=\"font-family: mincho; font-size: 11pt;\">isFinite \u95a2\u6570\u306f\u5024\u304c\u5229\u7528\u53ef\u80fd\u306a\u6570\u5024\u3067\u3042\u308b\u304b\u3092\u8abf\u3079\u308b\u3082\u3063\u3068\u3082\u3088\u3044\u65b9\u6cd5\u3060\u3002\u306a\u305c\u306a\u3089\u3053\u306e\u95a2\u6570\u306f\u3001NaN \u3068 Infinity \u3092\u3069\u3061\u3089\u3082 false \u3068\u5224\u65ad\u3057\u3066\u304f\u308c\u308b\u304b\u3089\u3067\u3042\u308b\u3002\u3057\u304b\u3057\u3001\u6b8b\u5ff5\u306a\u3053\u3068\u306b\u3001isFinite \u306f\u4e0e\u3048\u3089\u308c\u305f\u30aa\u30da\u30e9\u30f3\u30c9\u3092\u307e\u305a\u6570\u5024\u306b\u5909\u63db\u3057\u3088\u3046\u3068\u3057\u3066\u3057\u307e\u3046\u3002\u3057\u305f\u304c\u3063\u3066\u8abf\u3079\u305f\u3044\u5024\u304c\u6570\u5024\u578b\u3067\u306f\u306a\u304b\u3063\u305f\u5834\u5408\u306b\u306f\u3001\u3053\u308c\u306f\u826f\u3044\u30c6\u30b9\u30c8\u65b9\u6cd5\u3068\u306f\u8a00\u3048\u306a\u3044\u3002\u3082\u3057\u304b\u3057\u305f\u3089\u3042\u306a\u305f\u306f\u3001isNumber \u95a2\u6570\u3092\u81ea\u5206\u3067\u5b9a\u7fa9\u3057\u305f\u304f\u306a\u308b\u304b\u3082\u3057\u308c\u306a\u3044\u3002<\/span><\/em><\/p>\n<pre class=\"brush: actionscript3; gutter: false; first-line: 1\">var isNumber = function isNumber(value) {\r\n\u00a0 return typeof value === 'number' &amp;&amp; isFinite(value);\r\n};<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>JavaScript \u3067\u306f\u3001Number()\u3067\u6570\u5024\u4ee5\u5916\u306e\u6587\u5b57\u5217\u3092\u6570\u5024\u306b\u5909\u63db\u3057\u3088\u3046\u3068\u3059\u308b\u3068\u3001\u95a2\u6570\u306fNaN\u3092\u8fd4\u3057\u307e\u3059\u3002NaN\u3092typeof\u6f14\u7b97\u5b50\u3067\u5224\u5b9a\u3057\u3088\u3046\u3068\u3057\u3066\u3082&#8217;number&#8217;\u3068\u5224\u5b9a\u3055\u308c\u3066\u4e0a\u624b\u304f\u884c &hellip; <a href=\"https:\/\/www.stuffy.site\/wordpress\/?p=2461\" class=\"more-link\">\u7d9a\u304d\u3092\u8aad\u3080 <span class=\"screen-reader-text\">\u5024\u306e\u5909\u63db<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[87,5],"tags":[],"class_list":["post-2461","post","type-post","status-publish","format-standard","hentry","category-javascript","category-software"],"_links":{"self":[{"href":"https:\/\/www.stuffy.site\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/2461","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.stuffy.site\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.stuffy.site\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.stuffy.site\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.stuffy.site\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2461"}],"version-history":[{"count":18,"href":"https:\/\/www.stuffy.site\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/2461\/revisions"}],"predecessor-version":[{"id":2485,"href":"https:\/\/www.stuffy.site\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/2461\/revisions\/2485"}],"wp:attachment":[{"href":"https:\/\/www.stuffy.site\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2461"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.stuffy.site\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2461"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.stuffy.site\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2461"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}