{"id":54,"date":"2015-07-11T13:28:49","date_gmt":"2015-07-11T04:28:49","guid":{"rendered":"http:\/\/ati.art.coocan.jp\/blog\/?p=54"},"modified":"2016-09-11T17:43:35","modified_gmt":"2016-09-11T08:43:35","slug":"__proto__%e3%81%b8%e3%81%ae%e5%8f%82%e7%85%a7%e3%83%86%e3%82%b9%e3%83%88","status":"publish","type":"post","link":"http:\/\/ati.art.coocan.jp\/blog\/?p=54","title":{"rendered":"__proto__\u3078\u306e\u53c2\u7167\u30c6\u30b9\u30c8"},"content":{"rendered":"<div id=\"toc_container\" class=\"no_bullets\"><p class=\"toc_title\">\u76ee\u6b21<\/p><ul class=\"toc_list\"><li><a href=\"#i\">\u6982\u8981<\/a><\/li><li><a href=\"#i-2\">\u691c\u8a3c<\/a><\/li><li><a href=\"#i-3\">\u30e1\u30e2<\/a><\/li><\/ul><\/div>\n<h2><span id=\"i\">\u6982\u8981<\/span><\/h2>\n<p>prototype\u306b\u8272\u3005\u5024\u3092\u5165\u308c\u3066\u307f\u3066\u306e\u691c\u8a3c<\/p>\n<h2><span id=\"i-2\">\u691c\u8a3c<\/span><\/h2>\n<pre class=\"brush: jscript; title: ; notranslate\" title=\"\">\/\/Define\r\nvar Class=function(){};\r\nClass.prototype.x=999;\r\n\/\/Exe\r\nonload=function(){\r\n    var tempClass=new Class();\r\n    console.log(tempClass.x);\/\/ 999\r\n    tempClass.x=2;\r\n    console.log(tempClass.x);\/\/ 2\r\n    tempClass.x=null;\r\n    console.log(tempClass.x);\/\/ null\r\n    tempClass.x=0;\r\n    console.log(tempClass.x);\/\/ 0\r\n    tempClass.x=false;\r\n    console.log(tempClass.x);\/\/ false\r\n    tempClass.x=undefined;\r\n    console.log(tempClass.x);\/\/ undefined\r\n    delete tempClass.x;\r\n    console.log(tempClass.x);\/\/ 999\r\n};<\/pre>\n<h2><span id=\"i-3\">\u30e1\u30e2<\/span><\/h2>\n<ul>\n<li>\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\u5f8c\u306b\u3001\u53c2\u7167\u3057\u305f\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u306a\u3044\u5834\u5408\u3001__proto__\u304b\u3089\u3072\u3063\u3071\u3063\u3066\u3053\u3088\u3046\u3068\u3059\u308b\u3002 -&gt;\u00a0999<\/li>\n<li>\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u5024\u304c\u4ee3\u5165\u3055\u308c\u308b\u3068\u512a\u5148\u7684\u306b\u305d\u3061\u3089\u3092\u53c2\u7167\u3059\u308b -&gt; 2\n<ul>\n<li>prototype\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u306f\u53c2\u7167\u4ee5\u5916\u3092\u5165\u308c\u3066\u3082\u4f7f\u3048\u308b\u3002<\/li>\n<li>\u5206\u304b\u3063\u3066\u305f\u4e8b\u3067\u306f\u3042\u308b\u304c\u3001\u3053\u3093\u306a\u4f7f\u3044\u65b9\u3092\u3059\u308b\u4eba\u304c\u3044\u308b\u304b\u306f\u4e0d\u660e\n<ul>\n<li>static\u7684\u306a\u4f7f\u3044\u65b9\u304c\u3067\u304d\u306a\u304f\u3082\u306a\u3055\u305d\u3046\u306a\u306e\u3067\u3001\u30af\u30ed\u30fc\u30b8\u30e3\u5acc\u3044\u306a\u4eba\u3068\u304b\u304c\u4f7f\u3046&#8230;?<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>__proto__\u304b\u3089\u5024\u3092\u53c2\u7167\u3059\u308b\u6761\u4ef6\u306f (\u30e1\u30f3\u30d0\u30fc==false) \u3067\u306f\u306a\u3044 -&gt; 0 null false undefined<\/li>\n<li><span style=\"color: #ff0000;\">\u65e2\u306b\u5024\u304c\u3042\u308b\u5834\u5408\u3001 delete \u6f14\u7b97\u5b50\u306b\u3088\u3063\u3066\u307e\u305f__proto__\u304b\u3089\u5024\u3092\u53c2\u7167\u3059\u308b\u3088\u3046\u306b\u306a\u308b\u3002<\/span> -&gt; 999<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u76ee\u6b21\u6982\u8981\u691c\u8a3c\u30e1\u30e2 \u6982\u8981 prototype\u306b\u8272\u3005\u5024\u3092\u5165\u308c\u3066\u307f\u3066\u306e\u691c\u8a3c \u691c\u8a3c \u30e1\u30e2 \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\u5f8c\u306b\u3001\u53c2\u7167\u3057\u305f\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u306a\u3044\u5834\u5408\u3001__proto__\u304b\u3089\u3072\u3063\u3071\u3063\u3066\u3053\u3088\u3046\u3068\u3059\u308b\u3002 -&gt;\u00a0999 \u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u5024\u304c\u4ee3\u5165 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[6],"tags":[16],"_links":{"self":[{"href":"http:\/\/ati.art.coocan.jp\/blog\/index.php?rest_route=\/wp\/v2\/posts\/54"}],"collection":[{"href":"http:\/\/ati.art.coocan.jp\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/ati.art.coocan.jp\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/ati.art.coocan.jp\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/ati.art.coocan.jp\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=54"}],"version-history":[{"count":2,"href":"http:\/\/ati.art.coocan.jp\/blog\/index.php?rest_route=\/wp\/v2\/posts\/54\/revisions"}],"predecessor-version":[{"id":1149,"href":"http:\/\/ati.art.coocan.jp\/blog\/index.php?rest_route=\/wp\/v2\/posts\/54\/revisions\/1149"}],"wp:attachment":[{"href":"http:\/\/ati.art.coocan.jp\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=54"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/ati.art.coocan.jp\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=54"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/ati.art.coocan.jp\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=54"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}