{"id":53255,"date":"2024-12-03T11:16:51","date_gmt":"2024-12-03T03:16:51","guid":{"rendered":"https:\/\/fwq.ai\/blog\/53255\/"},"modified":"2024-12-03T11:16:51","modified_gmt":"2024-12-03T03:16:51","slug":"%e5%8f%af%e9%80%89%e9%93%be%e5%a4%aa%e6%a3%92%e4%ba%86%ef%bc%81","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/53255\/","title":{"rendered":"\u53ef\u9009\u94fe\u592a\u68d2\u4e86\uff01"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>\u53ef\u9009\u94fe\u592a\u68d2\u4e86\uff01<\/h1>\n<p><span style=\"cursor: pointer\"><i><\/i>\u6536\u85cf<\/span>    <\/p>\n<p>\u5c0f\u4f19\u4f34\u4eec\u6709\u6ca1\u6709\u89c9\u5f97\u5b66\u4e60<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u6587\u7ae0<\/span>\u5f88\u6709\u610f\u601d\uff1f\u6709\u610f\u601d\u5c31\u5bf9\u4e86\uff01\u4eca\u5929\u5c31\u7ed9\u5927\u5bb6\u5e26\u6765<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300a\u53ef\u9009\u94fe\u592a\u68d2\u4e86\uff01\u300b<\/span>\uff0c\u4ee5\u4e0b\u5185\u5bb9\u5c06\u4f1a\u6d89\u53ca\u5230<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\uff0c\u82e5\u662f\u5728\u5b66\u4e60\u4e2d\u5bf9\u5176\u4e2d\u90e8\u5206\u77e5\u8bc6\u70b9\u6709\u7591\u95ee\uff0c\u6216\u8bb8\u770b\u4e86\u672c\u6587\u5c31\u80fd\u5e2e\u5230\u4f60\uff01<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241128\/1732780241674820d134a57.jpg\" class=\"aligncenter\" title=\"\u53ef\u9009\u94fe\u592a\u68d2\u4e86\uff01\u63d2\u56fe\" alt=\"\u53ef\u9009\u94fe\u592a\u68d2\u4e86\uff01\u63d2\u56fe\" \/><\/p>\n<p>\u53ef\u9009\u94fe\u662f\u6211\u6700\u559c\u6b22\u7684 javascript \u529f\u80fd\u4e4b\u4e00\uff01<\/p>\n<p>\u5b83\u53ef\u4ee5\u5e2e\u52a9\u60a8\u5b89\u5168\u5730\u8bbf\u95ee\u5c5e\u6027\uff0c\u5373\u4f7f\u5b83\u4eec\u672a\u5b9a\u4e49\u6216\u4e3a null\uff0c\u4e5f\u4e0d\u4f1a\u5f15\u53d1\u4efb\u4f55\u9519\u8bef\u3002<\/p>\n<p>\u60a8\u53ef\u4ee5\u7b80\u5355\u5730\u4f7f\u7528 ? \u6765\u4ee3\u66ff\u7f16\u5199\u53c8\u957f\u53c8\u6df7\u4e71\u7684\u4ee3\u7801\u6765\u68c0\u67e5\u6bcf\u4e2a\u5c5e\u6027\u662f\u5426\u5b58\u5728\uff0c\u5b83\u53ef\u4ee5\u7f29\u77ed\u60a8\u7684\u4ee3\u7801\u5e76\u4f7f\u5176\u66f4\u52a0\u7b80\u6d01\u3002<\/p>\n<p>\u8fd9\u662f\u4e00\u4e2a\u4f8b\u5b50\uff1a<\/p>\n<pre>const user = { profile: { name: 'Alice' } };\n\n\/\/ Without Optional Chaining\n\nconst userName = user &amp;&amp; user.profile &amp;&amp; user.profile.name;\n\n\/\/ With Optional Chaining\n\nconst userName = user?.profile?.name;\n<\/pre>\n<p>\u5728\u60a8\u7684\u4e0b\u4e00\u4e2a\u9879\u76ee\u4e2d\u5c1d\u8bd5\u4e00\u4e0b &#8211; \u6211\u76f8\u4fe1\u60a8\u4f1a\u653e\u5fc3\u5730\u6446\u8131\u90a3\u4e9b\u201c\u65e0\u6cd5\u8bfb\u53d6\u5c5e\u6027\u201d\u9519\u8bef\uff01<\/p>\n<hr>\n<p>\u8981\u4e86\u89e3\u66f4\u591a\u4e0e web \u5f00\u53d1\u548c ai \u76f8\u5173\u7684\u5185\u5bb9\uff0c\u8bf7\u968f\u65f6\u5173\u6ce8\u6211\u3002\u8ba9\u6211\u4eec\u4e00\u8d77\u5b66\u4e60\uff0c\u4e00\u8d77\u6210\u957f\uff01<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u672c\u6587\u7684\u5168\u90e8\u5185\u5bb9\u4e86\uff0c\u662f\u5426\u6709\u987a\u5229\u5e2e\u52a9\u4f60\u89e3\u51b3\u95ee\u9898\uff1f\u82e5\u662f\u80fd\u7ed9\u4f60\u5e26\u6765\u5b66\u4e60\u4e0a\u7684\u5e2e\u52a9\uff0c\u8bf7\u5927\u5bb6\u591a\u591a\u652f\u6301\u7c73\u4e91\uff01\u66f4\u591a\u5173\u4e8e\u6587\u7ae0\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u4e5f\u53ef\u5173\u6ce8\u7c73\u4e91\u516c\u4f17\u53f7\u3002<\/p>\n<p>      \u7248\u672c\u58f0\u660e \u672c\u6587\u8f6c\u8f7d\u4e8e\uff1adev.to \u5982\u6709\u4fb5\u72af\uff0c\u8bf7\u8054\u7cfb\u5220\u9664    <\/p>\n<dl>\n<dt><\/dt>\n<dd>\n   MySQL \u4e2d\u63d2\u5165\u66f4\u65b0\u65f6\u95f4\u6233\uff1a\u5982\u4f55\u907f\u514d\u5b8c\u6210\u65f6\u95f4\u6233\u65e9\u4e8e\u5f00\u59cb\u65f6\u95f4\u6233\uff1f\n <\/dd>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"<p>\u53ef\u9009\u94fe\u592a\u68d2\u4e86\uff01 \u6536\u85cf \u5c0f\u4f19\u4f34\u4eec\u6709\u6ca1\u6709\u89c9\u5f97\u5b66\u4e60\u6587\u7ae0\u5f88\u6709\u610f\u601d\uff1f\u6709\u610f\u601d\u5c31\u5bf9\u4e86\uff01\u4eca\u5929\u5c31\u7ed9\u5927\u5bb6\u5e26\u6765\u300a\u53ef\u9009\u94fe\u592a\u68d2\u4e86\uff01\u300b\uff0c\u4ee5\u4e0b\u5185\u5bb9\u5c06\u4f1a\u6d89\u53ca\u5230\uff0c\u82e5\u662f\u5728\u5b66\u4e60\u4e2d\u5bf9\u5176\u4e2d\u90e8\u5206\u77e5\u8bc6\u70b9\u6709\u7591\u95ee\uff0c\u6216\u8bb8\u770b\u4e86\u672c\u6587\u5c31\u80fd\u5e2e\u5230\u4f60\uff01 \u53ef\u9009\u94fe\u662f\u6211\u6700\u559c\u6b22\u7684 javascript \u529f\u80fd\u4e4b\u4e00\uff01 \u5b83\u53ef\u4ee5\u5e2e\u52a9\u60a8\u5b89\u5168\u5730\u8bbf\u95ee\u5c5e\u6027\uff0c\u5373\u4f7f\u5b83\u4eec\u672a\u5b9a\u4e49\u6216\u4e3a null\uff0c\u4e5f\u4e0d\u4f1a\u5f15\u53d1\u4efb\u4f55\u9519\u8bef\u3002 \u60a8\u53ef\u4ee5\u7b80\u5355\u5730\u4f7f\u7528 ? \u6765\u4ee3\u66ff\u7f16\u5199\u53c8\u957f\u53c8\u6df7\u4e71\u7684\u4ee3\u7801\u6765\u68c0\u67e5\u6bcf\u4e2a\u5c5e\u6027\u662f\u5426\u5b58\u5728\uff0c\u5b83\u53ef\u4ee5\u7f29\u77ed\u60a8\u7684\u4ee3\u7801\u5e76\u4f7f\u5176\u66f4\u52a0\u7b80\u6d01\u3002 \u8fd9\u662f\u4e00\u4e2a\u4f8b\u5b50\uff1a const user = { profile: { name: &#8216;Alice&#8217; } }; \/\/ Without Optional Chaining const userName = user &amp;&amp; user.profile &amp;&amp; user.profile.name; \/\/ With Optional Chaining const userName = user?.profile?.name; \u5728\u60a8\u7684\u4e0b\u4e00\u4e2a\u9879\u76ee\u4e2d\u5c1d\u8bd5\u4e00\u4e0b &#8211; \u6211\u76f8\u4fe1\u60a8\u4f1a\u653e\u5fc3\u5730\u6446\u8131\u90a3\u4e9b\u201c\u65e0\u6cd5\u8bfb\u53d6\u5c5e\u6027\u201d\u9519\u8bef\uff01 \u8981\u4e86\u89e3\u66f4\u591a\u4e0e web \u5f00\u53d1\u548c ai \u76f8\u5173\u7684\u5185\u5bb9\uff0c\u8bf7\u968f\u65f6\u5173\u6ce8\u6211\u3002\u8ba9\u6211\u4eec\u4e00\u8d77\u5b66\u4e60\uff0c\u4e00\u8d77\u6210\u957f\uff01 \u4ee5\u4e0a\u5c31\u662f\u672c\u6587\u7684\u5168\u90e8\u5185\u5bb9\u4e86\uff0c\u662f\u5426\u6709\u987a\u5229\u5e2e\u52a9\u4f60\u89e3\u51b3\u95ee\u9898\uff1f\u82e5\u662f\u80fd\u7ed9\u4f60\u5e26\u6765\u5b66\u4e60\u4e0a\u7684\u5e2e\u52a9\uff0c\u8bf7\u5927\u5bb6\u591a\u591a\u652f\u6301\u7c73\u4e91\uff01\u66f4\u591a\u5173\u4e8e\u6587\u7ae0\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u4e5f\u53ef\u5173\u6ce8\u7c73\u4e91\u516c\u4f17\u53f7\u3002 \u7248\u672c\u58f0\u660e \u672c\u6587\u8f6c\u8f7d\u4e8e\uff1adev.to \u5982\u6709\u4fb5\u72af\uff0c\u8bf7\u8054\u7cfb\u5220\u9664 MySQL [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-53255","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/53255","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=53255"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/53255\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=53255"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=53255"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=53255"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}