{"id":2006,"date":"2024-11-10T09:45:51","date_gmt":"2024-11-10T01:45:51","guid":{"rendered":"https:\/\/fwq.ai\/blog\/2006\/"},"modified":"2024-11-10T09:45:51","modified_gmt":"2024-11-10T01:45:51","slug":"javascript-%e4%b8%ad-filter-%e6%96%b9%e6%b3%95%e4%b8%ba%e4%bb%80%e4%b9%88%e6%8e%92%e9%99%a4%e6%89%80%e6%9c%89%e5%8c%85%e5%90%ab%e7%89%b9%e5%ae%9a%e5%ad%97%e6%af%8d%e7%9a%84%e9%a1%b9%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/2006\/","title":{"rendered":"JavaScript \u4e2d filter() \u65b9\u6cd5\u4e3a\u4ec0\u4e48\u6392\u9664\u6240\u6709\u5305\u542b\u7279\u5b9a\u5b57\u6bcd\u7684\u9879\uff1f"},"content":{"rendered":"

\"JavaScript<\/p>\n

javascript \u4e2d filter() \u65b9\u6cd5\u8fd4\u56de\u503c\u89e3\u6790<\/strong><\/p>\n

filter() \u65b9\u6cd5\u904d\u5386\u6570\u7ec4\u4e2d\u6bcf\u4e00\u9879\uff0c\u6839\u636e\u63d0\u4f9b\u51fd\u6570\u7684\u8fd4\u56de\u503c\u6765\u8fc7\u6ee4\u6570\u7ec4\uff0c\u8fd4\u56de\u6ee1\u8db3\u6761\u4ef6\u7684\u9879\u3002<\/p>\n

\u95ee\u9898\u63d0\u51fa\uff1a<\/strong><\/p>\n

\u8003\u8651\u4ee5\u4e0b\u4ee3\u7801\uff1a<\/p>\n

\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n

const arr = [\"a\", \"b\", \"c\", \"d\"];\nconst result = arr.filter(item => item.indexOf(\"a\") > 0);<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u4ee3\u7801\u4e2d\uff0cfilter() \u65b9\u6cd5\u63a5\u6536\u4e00\u4e2a\u51fd\u6570\uff0c\u5224\u65ad\u9879\u4e2d\u662f\u5426\u5305\u542b\u5b57\u6bcd “a”\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a\u5305\u542b\u4e0d\u5305\u542b\u5b57\u6bcd “a” \u7684\u9879\u7684\u65b0\u6570\u7ec4\u3002<\/p>\n
\u7591\u95ee\uff1a<\/strong><\/p>\n
\u4f46\u662f\uff0c\u4ee3\u7801\u4e2d\u7684\u5224\u65ad\u6761\u4ef6 item.indexof(“a”) > 0 \u4ee5\u6570\u5b57\u5f62\u5f0f\u8fd4\u56de “a” \u5728\u9879\u4e2d\u7684\u4f4d\u7f6e\u3002\u8fd9\u6837\u7684\u8bdd\uff0c\u7ed3\u679c\u6570\u7ec4\u4e2d\u5e94\u8be5\u53ea\u6392\u9664\u9879 “a”\uff0c\u4f46\u5b9e\u9645\u4e0a\uff0c\u7ed3\u679c\u6570\u7ec4\u6392\u9664\u4e86\u6240\u6709\u9879\u3002\u4e3a\u4ec0\u4e48\u4f1a\u51fa\u73b0\u8fd9\u79cd\u60c5\u51b5\uff1f<\/p>\n
\u56de\u7b54\uff1a<\/strong><\/p>\n
\u8981\u7406\u89e3\u8fd9\u79cd\u884c\u4e3a\uff0c\u9700\u8981\u8003\u8651\u4ee5\u4e0b\u51e0\u70b9\uff1a<\/p>\n
    \n
  • indexof() \u8fd4\u56de\u4e00\u4e2a\u6570\u5b57\uff0c\u8868\u793a “a” \u5728\u9879\u4e2d\u51fa\u73b0\u7684\u4f4d\u7f6e\u3002\u5982\u679c\u627e\u4e0d\u5230\uff0c\u5219\u8fd4\u56de -1\u3002<\/li>\n
  • javascript \u4e2d\uff0c\u6570\u5b57\u8f6c\u6362\u4e3a\u5e03\u5c14\u503c\u65f6\uff0c\u9664\u4e86 0 \u548c nan \u4e4b\u5916\uff0c\u5176\u4ed6\u6240\u6709\u6570\u5b57\u90fd\u4e3a true\u3002<\/li>\n<\/ul>\n
    \u56e0\u6b64\uff0c\u5224\u65ad\u6761\u4ef6 item.indexof(“a”) > 0 \u5b9e\u9645\u4e0a\u6bd4\u8f83\u7684\u662f “a” \u5728\u9879\u4e2d\u51fa\u73b0\u7684\u4f4d\u7f6e\u662f\u5426\u5927\u4e8e 0\u3002\u5bf9\u4e8e\u5305\u542b “a” \u7684\u9879\uff0c\u8fd9\u4e2a\u6761\u4ef6\u8fd4\u56de true\uff0c\u56e0\u4e3a “a” \u7684\u4f4d\u7f6e\u4e3a 0\uff0c\u5927\u4e8e 0\u3002\u5bf9\u4e8e\u4e0d\u5305\u542b “a” \u7684\u9879\uff0c\u8fd9\u4e2a\u6761\u4ef6\u8fd4\u56de false\uff0c\u56e0\u4e3a “a” \u7684\u4f4d\u7f6e\u4e3a -1\uff0c\u5c0f\u4e8e 0\u3002<\/p>\n
    \u7531\u4e8e\u6761\u4ef6\u6bd4\u8f83\u7684\u662f\u4f4d\u7f6e\u662f\u5426\u5927\u4e8e 0\uff0c\u800c\u4e0d\u662f\u662f\u5426\u7b49\u4e8e 0\uff0c\u56e0\u6b64\u6240\u6709\u4e0d\u5305\u542b “a” \u7684\u9879\u7684\u6761\u4ef6\u90fd\u4e3a true\uff0c\u4ece\u800c\u88ab\u4fdd\u7559\u5728\u7ed3\u679c\u6570\u7ec4\u4e2d\u3002\u53ea\u6709\u5305\u542b “a” \u7684\u9879 “a” \u88ab\u6392\u9664\u5728\u5916\u3002<\/p>\n
    \u603b\u7ed3\u4e00\u4e0b\uff0cfilter() \u65b9\u6cd5\u8fd4\u56de\u503c\u7684\u95ee\u9898\u6e90\u4e8e\u6570\u5b57\u8f6c\u6362\u4e3a\u5e03\u5c14\u503c\u7684\u89c4\u5219\uff0c\u5bfc\u81f4\u4e86\u5224\u65ad\u6761\u4ef6\u7684\u4e0d\u51c6\u786e\u3002\u4e3a\u4e86\u6b63\u786e\u6392\u9664\u5305\u542b\u7279\u5b9a\u5b57\u6bcd\u7684\u9879\uff0c\u9700\u8981\u4f7f\u7528\u66f4\u660e\u786e\u7684\u5224\u65ad\u6761\u4ef6\uff0c\u4f8b\u5982\u76f4\u63a5\u5224\u65ad item.indexof(“a”) !== -1\u3002<\/p>\n
    \u4ee5\u4e0a\u5c31\u662fJavaScript \u4e2d filter() \u65b9\u6cd5\u4e3a\u4ec0\u4e48\u6392\u9664\u6240\u6709\u5305\u542b\u7279\u5b9a\u5b57\u6bcd\u7684\u9879\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":"
    javascript \u4e2d filter() \u65b9\u6cd5\u8fd4\u56de\u503c\u89e3\u6790 filter() \u65b9\u6cd5\u904d\u5386\u6570\u7ec4\u4e2d\u6bcf\u4e00\u9879\uff0c\u6839\u636e\u63d0\u4f9b\u51fd\u6570\u7684\u8fd4\u56de\u503c\u6765\u8fc7\u6ee4\u6570\u7ec4\uff0c\u8fd4\u56de\u6ee1\u8db3\u6761\u4ef6\u7684\u9879\u3002 \u95ee\u9898\u63d0\u51fa\uff1a \u8003\u8651\u4ee5\u4e0b\u4ee3\u7801\uff1a \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b const arr = [“a”, “b”, “c”, “d”]; const result = arr.filter(item => item.indexOf(“a”) > 0); \u767b\u5f55\u540e\u590d\u5236 \u4ee3\u7801\u4e2d\uff0cfilter() \u65b9\u6cd5\u63a5\u6536\u4e00\u4e2a\u51fd\u6570\uff0c\u5224\u65ad\u9879\u4e2d\u662f\u5426\u5305\u542b\u5b57\u6bcd “a”\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a\u5305\u542b\u4e0d\u5305\u542b\u5b57\u6bcd “a” \u7684\u9879\u7684\u65b0\u6570\u7ec4\u3002 \u7591\u95ee\uff1a \u4f46\u662f\uff0c\u4ee3\u7801\u4e2d\u7684\u5224\u65ad\u6761\u4ef6 item.indexof(“a”) > 0 \u4ee5\u6570\u5b57\u5f62\u5f0f\u8fd4\u56de “a” \u5728\u9879\u4e2d\u7684\u4f4d\u7f6e\u3002\u8fd9\u6837\u7684\u8bdd\uff0c\u7ed3\u679c\u6570\u7ec4\u4e2d\u5e94\u8be5\u53ea\u6392\u9664\u9879 “a”\uff0c\u4f46\u5b9e\u9645\u4e0a\uff0c\u7ed3\u679c\u6570\u7ec4\u6392\u9664\u4e86\u6240\u6709\u9879\u3002\u4e3a\u4ec0\u4e48\u4f1a\u51fa\u73b0\u8fd9\u79cd\u60c5\u51b5\uff1f \u56de\u7b54\uff1a \u8981\u7406\u89e3\u8fd9\u79cd\u884c\u4e3a\uff0c\u9700\u8981\u8003\u8651\u4ee5\u4e0b\u51e0\u70b9\uff1a indexof() \u8fd4\u56de\u4e00\u4e2a\u6570\u5b57\uff0c\u8868\u793a “a” \u5728\u9879\u4e2d\u51fa\u73b0\u7684\u4f4d\u7f6e\u3002\u5982\u679c\u627e\u4e0d\u5230\uff0c\u5219\u8fd4\u56de -1\u3002 javascript \u4e2d\uff0c\u6570\u5b57\u8f6c\u6362\u4e3a\u5e03\u5c14\u503c\u65f6\uff0c\u9664\u4e86 0 \u548c nan \u4e4b\u5916\uff0c\u5176\u4ed6\u6240\u6709\u6570\u5b57\u90fd\u4e3a true\u3002 \u56e0\u6b64\uff0c\u5224\u65ad\u6761\u4ef6 item.indexof(“a”) […]<\/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-2006","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/2006","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=2006"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/2006\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=2006"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=2006"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=2006"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}