{"id":52780,"date":"2024-12-03T11:02:47","date_gmt":"2024-12-03T03:02:47","guid":{"rendered":"https:\/\/fwq.ai\/blog\/52780\/"},"modified":"2024-12-03T11:02:47","modified_gmt":"2024-12-03T03:02:47","slug":"javascript%e5%a6%82%e4%bd%95%e7%ae%80%e6%b4%81%e5%9c%b0%e5%88%9d%e5%a7%8b%e5%8c%96%e5%a4%9a%e4%b8%aa%e5%8f%98%e9%87%8f%e4%b8%banull%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/52780\/","title":{"rendered":"JavaScript\u5982\u4f55\u7b80\u6d01\u5730\u521d\u59cb\u5316\u591a\u4e2a\u53d8\u91cf\u4e3anull\uff1f"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>JavaScript\u5982\u4f55\u7b80\u6d01\u5730\u521d\u59cb\u5316\u591a\u4e2a\u53d8\u91cf\u4e3anull\uff1f<\/h1>\n<p>\u6b22\u8fce\u5404\u4f4d\u5c0f\u4f19\u4f34\u6765\u5230\u7c73\u4e91\uff0c\u76f8\u805a\u4e8e\u6b64\u90fd\u662f\u7f18\u54c8\u54c8\u54c8\uff01\u4eca\u5929\u6211\u7ed9\u5927\u5bb6\u5e26\u6765<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300aJavaScript\u5982\u4f55\u7b80\u6d01\u5730\u521d\u59cb\u5316\u591a\u4e2a\u53d8\u91cf\u4e3anull\uff1f\u300b<\/span>\uff0c\u8fd9\u7bc7\u6587\u7ae0\u4e3b\u8981\u8bb2\u5230<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\u7b49\u7b49\u77e5\u8bc6\uff0c\u5982\u679c\u4f60\u5bf9<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u6587\u7ae0<\/span>\u76f8\u5173\u7684\u77e5\u8bc6\u975e\u5e38\u611f\u5174\u8da3\u6216\u8005\u6b63\u5728\u81ea\u5b66\uff0c\u90fd\u53ef\u4ee5\u5173\u6ce8\u6211\uff0c\u6211\u4f1a\u6301\u7eed\u66f4\u65b0\u76f8\u5173\u6587\u7ae0\uff01\u5f53\u7136\uff0c\u6709\u4ec0\u4e48\u5efa\u8bae\u4e5f\u6b22\u8fce\u5728\u8bc4\u8bba\u7559\u8a00\u63d0\u51fa\uff01\u4e00\u8d77\u5b66\u4e60\uff01<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241123\/173234056967416b5913a60.jpg\" class=\"aligncenter\" title=\"JavaScript\u5982\u4f55\u7b80\u6d01\u5730\u521d\u59cb\u5316\u591a\u4e2a\u53d8\u91cf\u4e3anull\uff1f\u63d2\u56fe\" alt=\"JavaScript\u5982\u4f55\u7b80\u6d01\u5730\u521d\u59cb\u5316\u591a\u4e2a\u53d8\u91cf\u4e3anull\uff1f\u63d2\u56fe\" \/><\/p>\n<p><strong>javascript\u7b80\u6d01\u521d\u59cb\u5316\u591a\u4e2a\u53d8\u91cf\u4e3anull<\/strong><\/p>\n<p>\u5728javascript\u4e2d\u5b9a\u4e49\u548c\u521d\u59cb\u5316\u4e00\u4e2a\u53d8\u91cf\u4e3anull\u7684\u5e38\u7528\u5199\u6cd5\u662f\uff1a<\/p>\n<pre>let resourceid = null;<\/pre>\n<p>\u7136\u800c\uff0c\u5982\u679c\u9700\u8981\u540c\u65f6\u521d\u59cb\u5316\u591a\u4e2a\u53d8\u91cf\uff0c\u8fd9\u79cd\u65b9\u6cd5\u4f1a\u5f88\u7e41\u7410\u3002\u4e3a\u6b64\uff0c\u6709\u4e00\u79cd\u7b80\u5355\u7684\u65b9\u6cd5\u53ef\u4ee5\u521d\u59cb\u5316\u591a\u4e2a\u53d8\u91cf\u4e3anull\uff1a<\/p>\n<pre>let resourceid = uniqueno = unitname = null;<\/pre>\n<p>\u8fd9\u79cd\u5199\u6cd5\u76f8\u5f53\u4e8e\u4e3a\u6bcf\u4e2a\u53d8\u91cf\u5355\u72ec\u8d4b\u4e88null\u503c\uff0c\u4f8b\u5982\uff1a<\/p>\n<pre>let resourceid = null;\nlet uniqueno = null;\nlet unitname = null;<\/pre>\n<p>\u66ff\u4ee3\u65b9\u6848\uff1a<\/p>\n<p>\u9664\u4e86\u4e0a\u8ff0\u65b9\u6cd5\uff0c\u8fd8\u6709\u4e00\u79cd\u66f4\u7b80\u6d01\u7684\u65b9\u6cd5\u53ef\u4ee5\u4f7f\u7528\u89e3\u6784\u8d4b\u503c\u6765\u521d\u59cb\u5316\u591a\u4e2a\u53d8\u91cf\u4e3anull\uff1a<\/p>\n<pre>let [resourceId, uniqueNo, unitName] = [null, null, null];<\/pre>\n<p>\u8fd9\u79cd\u65b9\u6cd5\u5c06null\u503c\u5206\u914d\u7ed9\u5bf9\u5e94\u7684\u53d8\u91cf\uff0c\u8bed\u6cd5\u66f4\u7b80\u6d01\uff0c\u6613\u4e8e\u9605\u8bfb\u548c\u7ef4\u62a4\u3002<\/p>\n<p>\u4eca\u5929\u5173\u4e8e\u300aJavaScript\u5982\u4f55\u7b80\u6d01\u5730\u521d\u59cb\u5316\u591a\u4e2a\u53d8\u91cf\u4e3anull\uff1f\u300b\u7684\u5185\u5bb9\u5c31\u4ecb\u7ecd\u5230\u8fd9\u91cc\u4e86\uff0c\u662f\u4e0d\u662f\u5b66\u8d77\u6765\u4e00\u76ee\u4e86\u7136\uff01\u60f3\u8981\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u7684\u5185\u5bb9\u8bf7\u5173\u6ce8\u7c73\u4e91\u516c\u4f17\u53f7\uff01<\/p>\n<dl>\n<dt><\/dt>\n<dd>\n   \u5982\u4f55\u8f7b\u677e\u5173\u95ed\u7535\u8111\u89e6\u6478\u677f\uff1a\u8be6\u7ec6\u6b65\u9aa4\u4e0e\u6280\u5de7\n <\/dd>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"<p>JavaScript\u5982\u4f55\u7b80\u6d01\u5730\u521d\u59cb\u5316\u591a\u4e2a\u53d8\u91cf\u4e3anull\uff1f \u6b22\u8fce\u5404\u4f4d\u5c0f\u4f19\u4f34\u6765\u5230\u7c73\u4e91\uff0c\u76f8\u805a\u4e8e\u6b64\u90fd\u662f\u7f18\u54c8\u54c8\u54c8\uff01\u4eca\u5929\u6211\u7ed9\u5927\u5bb6\u5e26\u6765\u300aJavaScript\u5982\u4f55\u7b80\u6d01\u5730\u521d\u59cb\u5316\u591a\u4e2a\u53d8\u91cf\u4e3anull\uff1f\u300b\uff0c\u8fd9\u7bc7\u6587\u7ae0\u4e3b\u8981\u8bb2\u5230\u7b49\u7b49\u77e5\u8bc6\uff0c\u5982\u679c\u4f60\u5bf9\u6587\u7ae0\u76f8\u5173\u7684\u77e5\u8bc6\u975e\u5e38\u611f\u5174\u8da3\u6216\u8005\u6b63\u5728\u81ea\u5b66\uff0c\u90fd\u53ef\u4ee5\u5173\u6ce8\u6211\uff0c\u6211\u4f1a\u6301\u7eed\u66f4\u65b0\u76f8\u5173\u6587\u7ae0\uff01\u5f53\u7136\uff0c\u6709\u4ec0\u4e48\u5efa\u8bae\u4e5f\u6b22\u8fce\u5728\u8bc4\u8bba\u7559\u8a00\u63d0\u51fa\uff01\u4e00\u8d77\u5b66\u4e60\uff01 javascript\u7b80\u6d01\u521d\u59cb\u5316\u591a\u4e2a\u53d8\u91cf\u4e3anull \u5728javascript\u4e2d\u5b9a\u4e49\u548c\u521d\u59cb\u5316\u4e00\u4e2a\u53d8\u91cf\u4e3anull\u7684\u5e38\u7528\u5199\u6cd5\u662f\uff1a let resourceid = null; \u7136\u800c\uff0c\u5982\u679c\u9700\u8981\u540c\u65f6\u521d\u59cb\u5316\u591a\u4e2a\u53d8\u91cf\uff0c\u8fd9\u79cd\u65b9\u6cd5\u4f1a\u5f88\u7e41\u7410\u3002\u4e3a\u6b64\uff0c\u6709\u4e00\u79cd\u7b80\u5355\u7684\u65b9\u6cd5\u53ef\u4ee5\u521d\u59cb\u5316\u591a\u4e2a\u53d8\u91cf\u4e3anull\uff1a let resourceid = uniqueno = unitname = null; \u8fd9\u79cd\u5199\u6cd5\u76f8\u5f53\u4e8e\u4e3a\u6bcf\u4e2a\u53d8\u91cf\u5355\u72ec\u8d4b\u4e88null\u503c\uff0c\u4f8b\u5982\uff1a let resourceid = null; let uniqueno = null; let unitname = null; \u66ff\u4ee3\u65b9\u6848\uff1a \u9664\u4e86\u4e0a\u8ff0\u65b9\u6cd5\uff0c\u8fd8\u6709\u4e00\u79cd\u66f4\u7b80\u6d01\u7684\u65b9\u6cd5\u53ef\u4ee5\u4f7f\u7528\u89e3\u6784\u8d4b\u503c\u6765\u521d\u59cb\u5316\u591a\u4e2a\u53d8\u91cf\u4e3anull\uff1a let [resourceId, uniqueNo, unitName] = [null, null, null]; \u8fd9\u79cd\u65b9\u6cd5\u5c06null\u503c\u5206\u914d\u7ed9\u5bf9\u5e94\u7684\u53d8\u91cf\uff0c\u8bed\u6cd5\u66f4\u7b80\u6d01\uff0c\u6613\u4e8e\u9605\u8bfb\u548c\u7ef4\u62a4\u3002 \u4eca\u5929\u5173\u4e8e\u300aJavaScript\u5982\u4f55\u7b80\u6d01\u5730\u521d\u59cb\u5316\u591a\u4e2a\u53d8\u91cf\u4e3anull\uff1f\u300b\u7684\u5185\u5bb9\u5c31\u4ecb\u7ecd\u5230\u8fd9\u91cc\u4e86\uff0c\u662f\u4e0d\u662f\u5b66\u8d77\u6765\u4e00\u76ee\u4e86\u7136\uff01\u60f3\u8981\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u7684\u5185\u5bb9\u8bf7\u5173\u6ce8\u7c73\u4e91\u516c\u4f17\u53f7\uff01 \u5982\u4f55\u8f7b\u677e\u5173\u95ed\u7535\u8111\u89e6\u6478\u677f\uff1a\u8be6\u7ec6\u6b65\u9aa4\u4e0e\u6280\u5de7<\/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-52780","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/52780","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=52780"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/52780\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=52780"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=52780"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=52780"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}