{"id":2022,"date":"2024-11-10T14:39:35","date_gmt":"2024-11-10T06:39:35","guid":{"rendered":"https:\/\/fwq.ai\/blog\/2022\/"},"modified":"2024-11-10T14:39:35","modified_gmt":"2024-11-10T06:39:35","slug":"js-%e4%b8%ad-filter-%e6%96%b9%e6%b3%95%e7%9a%84%e8%bf%94%e5%9b%9e%e5%80%bc%e4%b8%ba%e4%bb%80%e4%b9%88%e4%b8%8d%e6%98%af%e9%a2%84%e6%9c%9f%e7%9a%84%e7%bb%93%e6%9e%9c%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/2022\/","title":{"rendered":"JS \u4e2d filter() \u65b9\u6cd5\u7684\u8fd4\u56de\u503c\u4e3a\u4ec0\u4e48\u4e0d\u662f\u9884\u671f\u7684\u7ed3\u679c\uff1f"},"content":{"rendered":"

\"JS<\/p>\n

JS \u4e2d filter() \u65b9\u6cd5\u8fd4\u56de\u503c\u8be6\u6790<\/strong><\/p>\n

JS \u4e2d\u7684 filter() \u65b9\u6cd5\u662f\u4e00\u4e2a\u7528\u4e8e\u4ece\u6570\u7ec4\u4e2d\u8fc7\u6ee4\u9879\u76ee\u7684\u5f3a\u5927\u5de5\u5177\u3002\u5b83\u901a\u8fc7\u5bf9\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u8fd0\u884c\u4f20\u5165\u7684\u51fd\u6570\u6765\u5b9e\u73b0\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a\u7531\u51fd\u6570\u8fd4\u56de true \u7684\u5143\u7d20\u7ec4\u6210\u7684\u6570\u7ec4\u3002<\/p>\n

\u95ee\u9898\u5206\u6790<\/strong><\/p>\n

\u7ed9\u5b9a\u4ee3\u7801\u4e2d\uff0cfilter() \u65b9\u6cd5\u4e2d\u7684\u51fd\u6570 item.indexOf(“a”) \u5c06\u8fd4\u56de\u7b2c\u4e00\u4e2a\u51fa\u73b0 “a” \u5b57\u7b26\u7684\u7d22\u5f15\u4f4d\u7f6e\u3002\u5982\u679c\u627e\u4e0d\u5230\uff0c\u5219\u8fd4\u56de -1\u3002<\/p>\n

\u7b54\u6848\u89e3\u6790<\/strong><\/p>\n

\u95ee\u9898\u6240\u5728\u662f\u5982\u4f55\u7406\u89e3\u51fd\u6570 item.indexOf(“a”) \u7684\u8fd4\u56de\u503c\u5bf9 filter() \u65b9\u6cd5\u7684\u5f71\u54cd\u3002<\/p>\n

\u9996\u5148\uff0cindexOf() \u8fd4\u56de\u7684\u662f\u4e00\u4e2a\u6570\u5b57\uff0c\u8868\u793a\u5143\u7d20\u7684\u4f4d\u7f6e\u6216 -1\u3002\u5728 JS \u4e2d\uff0c\u6570\u5b57\u4f1a\u4e3a\u5e03\u5c14\u503c\uff0c\u5176\u4e2d 0 \u548c NaN \u4ee5\u5916\u7684\u4efb\u4f55\u503c\u90fd\u89c6\u4e3a true\u3002<\/p>\n

\u5728\u7ed9\u5b9a\u7684\u793a\u4f8b\u4e2d\uff0c\u9664\u4e86 “a” \u5b57\u7b26\u4e4b\u5916\uff0c\u6240\u6709\u5143\u7d20\u7684 indexOf(“a”) \u90fd\u8fd4\u56de -1\u3002\u5f53 -1 \u8f6c\u6362\u4e3a\u5e03\u5c14\u503c\u65f6\uff0c\u5b83\u53d8\u6210 true\u3002\u56e0\u6b64\uff0cfilter() \u65b9\u6cd5\u8ba4\u4e3a\u9664\u4e86 “a” \u4e4b\u5916\u7684\u6240\u6709\u5143\u7d20\u90fd\u901a\u8fc7\u4e86\u6d4b\u8bd5\uff0c\u5e76\u5c06\u5176\u5305\u542b\u5728\u8fd4\u56de\u7684\u6570\u7ec4\u4e2d\u3002<\/p>\n

\u56e0\u6b64\uff0c\u6700\u7ec8\u7684\u7ed3\u679c\u662f\u4e00\u4e2a\u5305\u542b\u9664 “a” \u4e4b\u5916\u7684\u6240\u6709\u5143\u7d20\u7684\u6570\u7ec4\u3002<\/p>\n

\u4ee5\u4e0a\u5c31\u662fJS \u4e2d filter() \u65b9\u6cd5\u7684\u8fd4\u56de\u503c\u4e3a\u4ec0\u4e48\u4e0d\u662f\u9884\u671f\u7684\u7ed3\u679c\uff1f\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"

JS \u4e2d filter() \u65b9\u6cd5\u8fd4\u56de\u503c\u8be6\u6790 JS \u4e2d\u7684 filter() \u65b9\u6cd5\u662f\u4e00\u4e2a\u7528\u4e8e\u4ece\u6570\u7ec4\u4e2d\u8fc7\u6ee4\u9879\u76ee\u7684\u5f3a\u5927\u5de5\u5177\u3002\u5b83\u901a\u8fc7\u5bf9\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u8fd0\u884c\u4f20\u5165\u7684\u51fd\u6570\u6765\u5b9e\u73b0\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a\u7531\u51fd\u6570\u8fd4\u56de true \u7684\u5143\u7d20\u7ec4\u6210\u7684\u6570\u7ec4\u3002 \u95ee\u9898\u5206\u6790 \u7ed9\u5b9a\u4ee3\u7801\u4e2d\uff0cfilter() \u65b9\u6cd5\u4e2d\u7684\u51fd\u6570 item.indexOf(“a”) \u5c06\u8fd4\u56de\u7b2c\u4e00\u4e2a\u51fa\u73b0 “a” \u5b57\u7b26\u7684\u7d22\u5f15\u4f4d\u7f6e\u3002\u5982\u679c\u627e\u4e0d\u5230\uff0c\u5219\u8fd4\u56de -1\u3002 \u7b54\u6848\u89e3\u6790 \u95ee\u9898\u6240\u5728\u662f\u5982\u4f55\u7406\u89e3\u51fd\u6570 item.indexOf(“a”) \u7684\u8fd4\u56de\u503c\u5bf9 filter() \u65b9\u6cd5\u7684\u5f71\u54cd\u3002 \u9996\u5148\uff0cindexOf() \u8fd4\u56de\u7684\u662f\u4e00\u4e2a\u6570\u5b57\uff0c\u8868\u793a\u5143\u7d20\u7684\u4f4d\u7f6e\u6216 -1\u3002\u5728 JS \u4e2d\uff0c\u6570\u5b57\u4f1a\u4e3a\u5e03\u5c14\u503c\uff0c\u5176\u4e2d 0 \u548c NaN \u4ee5\u5916\u7684\u4efb\u4f55\u503c\u90fd\u89c6\u4e3a true\u3002 \u5728\u7ed9\u5b9a\u7684\u793a\u4f8b\u4e2d\uff0c\u9664\u4e86 “a” \u5b57\u7b26\u4e4b\u5916\uff0c\u6240\u6709\u5143\u7d20\u7684 indexOf(“a”) \u90fd\u8fd4\u56de -1\u3002\u5f53 -1 \u8f6c\u6362\u4e3a\u5e03\u5c14\u503c\u65f6\uff0c\u5b83\u53d8\u6210 true\u3002\u56e0\u6b64\uff0cfilter() \u65b9\u6cd5\u8ba4\u4e3a\u9664\u4e86 “a” \u4e4b\u5916\u7684\u6240\u6709\u5143\u7d20\u90fd\u901a\u8fc7\u4e86\u6d4b\u8bd5\uff0c\u5e76\u5c06\u5176\u5305\u542b\u5728\u8fd4\u56de\u7684\u6570\u7ec4\u4e2d\u3002 \u56e0\u6b64\uff0c\u6700\u7ec8\u7684\u7ed3\u679c\u662f\u4e00\u4e2a\u5305\u542b\u9664 “a” \u4e4b\u5916\u7684\u6240\u6709\u5143\u7d20\u7684\u6570\u7ec4\u3002 \u4ee5\u4e0a\u5c31\u662fJS \u4e2d filter() \u65b9\u6cd5\u7684\u8fd4\u56de\u503c\u4e3a\u4ec0\u4e48\u4e0d\u662f\u9884\u671f\u7684\u7ed3\u679c\uff1f\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/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-2022","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/2022","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=2022"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/2022\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=2022"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=2022"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=2022"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}