{"id":1069,"date":"2011-07-06T00:54:07","date_gmt":"2011-07-05T15:54:07","guid":{"rendered":"http:\/\/www.webcyou.com\/?p=1069"},"modified":"2012-02-10T02:27:06","modified_gmt":"2012-02-09T17:27:06","slug":"%e5%9e%8b","status":"publish","type":"post","link":"https:\/\/www.webcyou.com\/?p=1069","title":{"rendered":"JavaScript \u578b"},"content":{"rendered":"

\u578b\u3068\u306f\u6570\u5024\u3084\u6587\u5b57\u5217\u306e\u30c7\u30fc\u30bf\u306e\u7a2e\u985e\u306e\u3053\u3068\u3092\u793a\u3059\u3002<\/p>\n

\u578b\u306e\u7a2e\u985e<\/span><\/strong><\/p>\n\n\n\n\n\n\n\n\n\n
\u540d\u524d<\/strong><\/td>\n\u66f8\u304d\u65b9\uff08\u30ea\u30c6\u30e9\u30eb\uff09<\/strong><\/td>\ntypeof\u6f14\u7b97\u5b50\u306e\u7d50\u679c<\/strong><\/td>\n<\/tr>\n
\u6570\u5024\u578b<\/strong><\/td>\n1\u30842 10\u30843.14<\/td>\nnumber<\/td>\n<\/tr>\n
\u6587\u5b57\u5217\u578b<\/strong><\/td>\n‘\u3053\u3093\u306b\u3061\u306f’\u3084”\u30dd\u30c1”\u306a\u3069<\/td>\nstring<\/td>\n<\/tr>\n
\u8ad6\u7406\u5024\u578b<\/strong><\/td>\ntrue\u307e\u305f\u306ffalse<\/td>\nboolean<\/td>\n<\/tr>\n
\u672a\u5b9a\u7fa9\u578b<\/strong><\/td>\nundefined<\/td>\nundefined<\/td>\n<\/tr>\n
\u30cc\u30eb\u578b<\/strong><\/td>\nnull<\/td>\nobject<\/td>\n<\/tr>\n
\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u578b<\/td>\n<\/td>\nobject<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

typeof\u6f14\u7b97\u5b50\u3067\u578b\u3092\u8abf\u3079\u308b\u3068\u304d\u306e\u4f8b<\/strong><\/p>\n

\r\n<script type="text\/javascript">\r\nvar cat = "\u30bf\u30de";\r\ndocument.write("cat\u306e\u578b\u306f" + (typeof cat));\r\n<\/script>\r\n<\/pre>\n<\/p>\n
under fined<\/span><\/strong><\/p>\n
underfined\uff1a\u672a\u5b9a\u7fa9\u306f\u300c\u5909\u6570\u306b\u4f55\u3082\u5165\u3063\u3066\u3044\u306a\u3044\u300d\u3053\u3068\u3092\u8868\u3059\u3002<\/p>\n
var cat;<\/div>\n
document.write(“cat\u306f” + cat);<\/div>\n
\u8fd4\u308a\u5024\u3000underfined<\/div>\n
null<\/span><\/strong><\/div>\n
\u30cc\u30eb\u578b\u306f\u300c\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u306a\u3044\u300d<\/div>\n
cat = document.getElementById(“tama”);<\/div>\n
document.write(“cat\u306f” + cat);<\/div>\n
\u8fd4\u308a\u5024\u3000null<\/div>\n
\u6587\u5b57\u5217\u3084\u6570\u5024\u3078\u306e\u5909\u63db<\/strong><\/div>\n
<script type="text\/javascript">\r\nprice = window.prompt("\u5546\u54c1\u4fa1\u683c\u3092\u5165\u529b\u3057\u3066\u304f\u3060\u3055\u3044\u3002","");\r\ntotal =\u3000price* 1.05;\r\ndocument.write("\u5546\u54c1\u306e\u7a0e\u8fbc\u4fa1\u683c\u306f" + total + "\u3067\u3059\u3002");\r\n<\/script><\/pre>\n<\/p>\n
JavaScript\u3067\u306f\u81ea\u52d5\u3067\u6587\u5b57\u5217\u3084\u6570\u5024\u3078\u306e\u5909\u63db\u304c\u884c\u308f\u308c\u308b\u3002<\/span><\/strong><\/div>\n
\u305d\u306e\u4ed6\u306e\u578b\u306e\u5909\u63db<\/strong><\/div>\n\n\n\n\n\n\n\n
\u540d\u524d<\/strong><\/td>\n\u6587\u5b57\u5217\u306b\u5909\u63db<\/strong><\/td>\n\u6570\u5024\u306b\u5909\u63db<\/strong><\/td>\n<\/tr>\n
\u8ad6\u7406\u5024\u578b<\/td>\ntrue \u307e\u305f\u306f false<\/td>\n1\u307e\u305f\u306f0<\/td>\n<\/tr>\n
\u672a\u5b9a\u7fa9\u578b<\/td>\nunderfined<\/td>\nNaN<\/td>\n<\/tr>\n
\u30cc\u30eb\u578b<\/td>\nnull<\/td>\n0<\/td>\n<\/tr>\n
\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u578b<\/td>\n\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u3088\u308b<\/td>\n\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u3088\u308b<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"
\u578b\u3068\u306f\u6570\u5024\u3084\u6587\u5b57\u5217\u306e\u30c7\u30fc\u30bf\u306e\u7a2e\u985e\u306e\u3053\u3068\u3092\u793a\u3059\u3002 \u578b\u306e\u7a2e\u985e \u540d\u524d \u66f8\u304d\u65b9\uff08\u30ea\u30c6\u30e9\u30eb\uff09 typeof\u6f14\u7b97\u5b50\u306e\u7d50\u679c \u6570\u5024\u578b 1\u30842 10\u30843.14 number \u6587\u5b57\u5217\u578b ‘\u3053\u3093\u306b\u3061\u306f’\u3084” […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12],"tags":[47,46],"class_list":["post-1069","post","type-post","status-publish","format-standard","hentry","category-javascript","tag-javascript-2","tag-js"],"_links":{"self":[{"href":"https:\/\/www.webcyou.com\/index.php?rest_route=\/wp\/v2\/posts\/1069","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.webcyou.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.webcyou.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.webcyou.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.webcyou.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1069"}],"version-history":[{"count":12,"href":"https:\/\/www.webcyou.com\/index.php?rest_route=\/wp\/v2\/posts\/1069\/revisions"}],"predecessor-version":[{"id":2943,"href":"https:\/\/www.webcyou.com\/index.php?rest_route=\/wp\/v2\/posts\/1069\/revisions\/2943"}],"wp:attachment":[{"href":"https:\/\/www.webcyou.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1069"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.webcyou.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1069"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.webcyou.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1069"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}