{"id":3692,"date":"2024-01-30T19:00:00","date_gmt":"2024-01-30T10:00:00","guid":{"rendered":"https:\/\/zeoninc.com\/blog\/?p=3692"},"modified":"2024-01-30T11:37:32","modified_gmt":"2024-01-30T02:37:32","slug":"january%ef%bc%95","status":"publish","type":"post","link":"https:\/\/zeoninc.com\/blog\/2024\/01\/30\/january%ef%bc%95\/","title":{"rendered":"\u6700\u8fd1\u77e5\u3063\u305fjavascript\u306e\u66f8\u304d\u65b9"},"content":{"rendered":"\n<p>\u30b9\u30bf\u30c3\u30d5A\u3067\u3059\u3002<br><br><\/p>\n\n\n\n<p>\u5909\u6570\u306e\u5f8c\u306b\u300c\uff1f\u300d\u3092\u3064\u3051\u308b\u66f8\u304d\u65b9\u3092\u898b\u3064\u3051\u307e\u3057\u3066<br>\u521d\u898b\u306f\u610f\u5473\u304c\u308f\u304b\u3089\u306a\u304b\u3063\u305f\u306e\u3067\u3059\u304c\u8abf\u3079\u3066\u307f\u308b\u3068<br>obj\u304c\u5b9a\u7fa9\u3055\u308c\u3066\u308b\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3066\u304f\u308c\u308b\u66f8\u304d\u65b9\u306e\u3088\u3046\u3067<\/p>\n\n\n\n<p>let num = obj?.num;<br>console.log(num);<\/p>\n\n\n\n<p>\u4e0a\u8a18\u306e\u7d50\u679c\u306f\u30a8\u30e9\u30fc\u306b\u306a\u308b<\/p>\n\n\n\n<p>const obj = {<br>num : 1<br>}<\/p>\n\n\n\n<p>let num = obj?.num;<br>console.log(num);<\/p>\n\n\n\n<p>\u4e0a\u8a18\u3060\u30681\u3068\u8868\u793a\u3055\u308c\u308b<\/p>\n\n\n\n<p>\u77e5\u3089\u306a\u304b\u3063\u305f\u305d\u3093\u306a\u306e<br>\u4fbf\u5229\u304b\u3069\u3046\u304b\u306f\u8b0e\u3060\u3051\u308c\u3069\u6d77\u5916\u30bd\u30fc\u30b9\u3092\u898b\u308b\u3068\u3088\u304f\u66f8\u3044\u3066\u3042\u308b\u306e\u3067\u4e00\u822c\u7684\u306a\u3082\u306e\u306a\u3093\u3067\u3057\u3087\u3046<br>\u8abf\u3079\u3066\u307f\u305f\u3089\u30aa\u30d7\u30b7\u30e7\u30ca\u30eb\u30c1\u30a7\u30fc\u30f3\u3068\u3044\u3046\u540d\u79f0\u3060\u305d\u3046\u3067<\/p>\n\n\n\n<p><a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Web\/JavaScript\/Reference\/Operators\/Optional_chaining\">\u30aa\u30d7\u30b7\u30e7\u30ca\u30eb\u30c1\u30a7\u30fc\u30f3 (?.) &#8211; JavaScript | MDN<\/a><\/p>\n\n\n\n<p>\u7279\u306b\u305d\u3046\u3044\u3046\u3053\u3068\u3092\u77e5\u3089\u305a\u306bjavascript\u66f8\u3044\u3066\u3066\u30c0\u30e1\u3060\u306a\u3068\u601d\u3044\u307e\u3057\u305f<br>\u53cd\u7701<\/p>\n\n\n\n<p>\u6587\uff1a\u30b9\u30bf\u30c3\u30d5A<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u30b9\u30bf\u30c3\u30d5A\u3067\u3059\u3002 \u5909\u6570\u306e\u5f8c\u306b\u300c\uff1f\u300d\u3092\u3064\u3051\u308b\u66f8\u304d\u65b9\u3092\u898b\u3064\u3051\u307e\u3057\u3066\u521d\u898b\u306f\u610f\u5473\u304c\u308f\u304b\u3089\u306a\u304b\u3063\u305f\u306e\u3067\u3059\u304c\u8abf\u3079\u3066\u307f\u308b\u3068obj\u304c\u5b9a\u7fa9\u3055\u308c\u3066\u308b\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3066\u304f\u308c\u308b\u66f8\u304d\u65b9\u306e\u3088\u3046\u3067 let num = obj?.num;conso [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":3693,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/zeoninc.com\/blog\/wp-json\/wp\/v2\/posts\/3692"}],"collection":[{"href":"https:\/\/zeoninc.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/zeoninc.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/zeoninc.com\/blog\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/zeoninc.com\/blog\/wp-json\/wp\/v2\/comments?post=3692"}],"version-history":[{"count":2,"href":"https:\/\/zeoninc.com\/blog\/wp-json\/wp\/v2\/posts\/3692\/revisions"}],"predecessor-version":[{"id":3698,"href":"https:\/\/zeoninc.com\/blog\/wp-json\/wp\/v2\/posts\/3692\/revisions\/3698"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/zeoninc.com\/blog\/wp-json\/wp\/v2\/media\/3693"}],"wp:attachment":[{"href":"https:\/\/zeoninc.com\/blog\/wp-json\/wp\/v2\/media?parent=3692"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zeoninc.com\/blog\/wp-json\/wp\/v2\/categories?post=3692"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zeoninc.com\/blog\/wp-json\/wp\/v2\/tags?post=3692"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}