{"id":1379,"date":"2022-07-05T22:12:26","date_gmt":"2022-07-05T14:12:26","guid":{"rendered":"https:\/\/zhuxinyong.com\/?p=1379"},"modified":"2022-07-10T08:14:46","modified_gmt":"2022-07-10T00:14:46","slug":"javascript-zhong-de-huan-cun","status":"publish","type":"post","link":"https:\/\/zhuxinyong.com\/?p=1379","title":{"rendered":"57 &#8211; JavaScript \u4e2d\u7684\u7f13\u5b58"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/zhuxinyong.com\/wp-content\/uploads\/2022\/07\/16570303606149.jpg\" alt=\"\" \/><\/p>\n<p>\u539f\u6587\u5730\u5740\uff1a<a href=\"https:\/\/dev.to\/bhagatparwinder\/memoization-in-javascript-2ncl\" target=\"_blank\" rel=\"noopener\">https:\/\/dev.to\/bhagatparwinder\/memoization-in-javascript-2ncl<\/a><\/p>\n<p>JavaScript\u548c\u51fd\u6570\u5f0f\u7f16\u7a0b\u643a\u624b\u5e76\u8fdb\u3002\u6709\u4e9b\u65f6\u5019\uff0c\u6211\u4eec\u7684\u529f\u80fd\u5c06\u4f1a\u4ed8\u51fa\u9ad8\u6602\u7684\u6027\u80fd\u4ee3\u4ef7\u3002\u4e00\u76f4\u6267\u884c\u540c\u6837\u7684\u51fd\u6570\u63a5\u53d7\u540c\u6837\u7684\u53c2\u6570\u4f1a\u964d\u4f4e\u5e94\u7528\u7684\u6027\u80fd\u5e76\u4e14\u8fd9\u4e5f\u6ca1\u6709\u6bd4\u8f83\u3002<\/p>\n<p>\u7f13\u5b58\u662f\u4e00\u79cd\u4f18\u5316\u6280\u672f\uff0c\u7528\u6765\u4fdd\u5b58\u6211\u4eec\u51fd\u6570\u8fd4\u56de\u7684\u7ed3\u679c\u3002\u5982\u679c\u6211\u4eec\u5411\u540c\u4e00\u4e2a\u51fd\u6570\u8f93\u5165\u76f8\u540c\u7684\u53c2\u6570\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u4ece\u7f13\u5b58\u4e2d\u83b7\u53d6\u7ed3\u679c\u800c\u4e0d\u662f\u4ece\u6267\u884c\u4ee3\u7801\u83b7\u53d6\uff0c\u90a3\u6837\u4f1a\u5bfc\u81f4\u6027\u80fd\u95ee\u9898\u3002<\/p>\n<p>\u4e07\u4e00\u7ed3\u679c\u6ca1\u6709\u88ab\u547d\u4e2d\uff0c\u6211\u4eec\u5c06\u4f1a\u6267\u884c\u51fd\u6570\u4e14\u7f13\u5b58\u7ed3\u679c\u3002\u8ba9\u6211\u4eec\u4ee5\u8ba1\u7b97\u4e00\u4e2a\u6570\u7684\u5e73\u65b9\u4e3a\u4f8b\uff1a<\/p>\n<pre><code class=\"language-plain_text\">const square = () =&gt; {\n    let cache = {}; \/\/ set cache\n    return (value) =&gt; {\n        \/\/ if exists in cache return from cache\n        if (value in cache) {\n            console.log(&quot;Fetching from cache&quot;);\n            return cache[value];\n        } else {\n            \/\/ If not in cache perform operation\n            console.log(&quot;Performing expensive query&quot;);\n            const result = value * value;\n            cache[value] = result; \/\/ store the value in cache\n            return result; \/\/ return result\n        }\n    }\n}\n\nconst sq = square();\nconsole.log(sq(21)); \/\/ Performing expensive query, 441\nconsole.log(sq(21)); \/\/ Fetching from cache, 441\n<\/code><\/pre>\n<h2><a id=\"%E4%B8%BA%E4%BB%80%E4%B9%88%E4%BB%A5%E5%8F%8A%E4%BD%95%E6%97%B6%E4%BD%BF%E7%94%A8%E5%AE%83%EF%BC%9F\" class=\"anchor\" aria-hidden=\"true\"><span class=\"octicon octicon-link\"><\/span><\/a>\u4e3a\u4ec0\u4e48\u4ee5\u53ca\u4f55\u65f6\u4f7f\u7528\u5b83\uff1f<\/h2>\n<ul>\n<li>\u7528\u4e8e\u8017\u65f6\u7684\u51fd\u6570\u8c03\u7528\uff0c\u4f8b\u5982\uff1a\u4e00\u4e2a\u51fd\u6570\u8c03\u7528\u4e86\u7f51\u7edc\u4e14\u8fd4\u56de\u7ed3\u679c\u4e0d\u4f1a\u6539\u53d8\u6216\u9700\u8981\u5927\u91cf\u8ba1\u7b97\u7684\u51fd\u6570\u6216\u786c\u76d8\u8bfb\u5199\u3002<\/li>\n<li>\u7528\u4e8e\u7eaf\u51fd\u6570\uff08\u540c\u6837\u7684\u8f93\u5165\u76f8\u540c\u7684\u8f93\u51fa\uff09\u3002<\/li>\n<li>\u7528\u4e8e\u6709\u9650\u7684\u8f93\u5165\u4f46\u503c\u9ad8\u5ea6\u91cd\u590d\u7684\u51fd\u6570\u8c03\u7528\u3002<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u539f\u6587\u5730\u5740\uff1ahttps:\/\/dev.to\/bhagatparwinder\/memoization-in&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,20,3],"tags":[182,183],"class_list":["post-1379","post","type-post","status-publish","format-standard","hentry","category-all","category-frontend","category-tech","tag-memoization","tag-183"],"_links":{"self":[{"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=\/wp\/v2\/posts\/1379","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1379"}],"version-history":[{"count":2,"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=\/wp\/v2\/posts\/1379\/revisions"}],"predecessor-version":[{"id":1381,"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=\/wp\/v2\/posts\/1379\/revisions\/1381"}],"wp:attachment":[{"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1379"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1379"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zhuxinyong.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1379"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}