{"id":3368,"date":"2026-06-29T02:40:29","date_gmt":"2026-06-29T02:40:29","guid":{"rendered":"https:\/\/csofferprep.com\/servicenow-swe-vo-javascript-lru-system-design\/"},"modified":"2026-06-30T00:00:06","modified_gmt":"2026-06-30T00:00:06","slug":"servicenow-swe-vo-javascript-lru-system-design","status":"publish","type":"post","link":"https:\/\/csofferprep.com\/en\/vo\/servicenow-swe-vo-javascript-lru-system-design\/","title":{"rendered":"ServiceNow SWE VO \u9762\u7ecf\uff5cJavaScript Coding\u3001LRU Cache \u4e0e\u7cfb\u7edf\u8bbe\u8ba1\u590d\u76d8"},"content":{"rendered":"<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/csofferprep.com\/wp-content\/uploads\/2026\/06\/csofferprep_servicenow_vo_2026-06-29.png\" alt=\"ServiceNow VO \u9762\u7ecf\u914d\u56fe\" \/><\/figure>\n<p>\u8fd9\u5957 ServiceNow SWE VO \u8282\u594f\u5f88\u7d27\uff0cCoding \u91cc\u4f1a\u628a\u6570\u636e\u7ed3\u6784\u548c JavaScript \u5b9e\u73b0\u653e\u5728\u4e00\u8d77\u95ee\uff0c\u540e\u9762\u63a5\u9879\u76ee\u6df1\u6316\u548c\u7cfb\u7edf\u8bbe\u8ba1\u3002<a href=\"https:\/\/www.interviewquery.com\/interview-guides\/servicenow-software-engineer\" target=\"_blank\" rel=\"noopener\">Interview Query \u7684 ServiceNow guide<\/a> \u63d0\u5230\u6280\u672f\u9762\u4f1a\u8986\u76d6\u7b97\u6cd5\u3001\u6570\u636e\u7ed3\u6784\u3001JavaScript\u3001SQL \u548c\u7cfb\u7edf\u8bbe\u8ba1\uff1b\u51c6\u5907\u65f6\u4e0d\u80fd\u53ea\u5237\u9898\uff0c\u8fd8\u8981\u80fd\u628a\u7f13\u5b58\u3001\u5f02\u6b65\u4efb\u52a1\u548c\u4e1a\u52a1\u72b6\u6001\u6d41\u8f6c\u8bb2\u6e05\u695a\u3002<\/p>\n<h2>\u9762\u8bd5\u4fe1\u606f<\/h2>\n<ul>\n<li>\u5c97\u4f4d\uff1aSoftware Engineer<\/li>\n<li>\u5f62\u5f0f\uff1aVirtual Onsite<\/li>\n<li>\u8f6e\u6b21\uff1aCoding\u3001JavaScript \u5b9e\u73b0\u3001\u7cfb\u7edf\u8bbe\u8ba1\u3001BQ \/ \u9879\u76ee\u6df1\u6316<\/li>\n<li>\u91cd\u70b9\uff1a\u6570\u7ec4\u548c\u4e8c\u5206\u3001\u7f13\u5b58\u8bbe\u8ba1\u3001\u5f02\u6b65\u4efb\u52a1\u3001\u5de5\u5355\u72b6\u6001\u6d41\u8f6c\u3001\u9879\u76ee\u53d6\u820d<\/li>\n<\/ul>\n<h2>\u7b2c\u4e00\u9762\uff1aCoding\uff0c\u65cb\u8f6c\u6570\u7ec4\u641c\u7d22<\/h2>\n<p><strong>\u9898\u76ee<\/strong>\uff1a\u7ed9\u4e00\u4e2a\u5347\u5e8f\u6570\u7ec4\u5728\u67d0\u4e2a\u4f4d\u7f6e\u88ab\u65cb\u8f6c\u540e\u7684\u7ed3\u679c\uff0c\u518d\u7ed9\u4e00\u4e2a target\uff0c\u8fd4\u56de target \u7684\u4e0b\u6807\uff1b\u4e0d\u5b58\u5728\u5c31\u8fd4\u56de -1\u3002\u9762\u8bd5\u5b98\u8981\u6c42\u65f6\u95f4\u590d\u6742\u5ea6 O(log n)\uff0c\u5e76\u8ffd\u95ee\u91cd\u590d\u5143\u7d20\u51fa\u73b0\u65f6\u600e\u4e48\u5904\u7406\u3002<\/p>\n<p><strong>\u89e3\u7b54\u601d\u8def<\/strong>\uff1a\u5148\u7528\u4e8c\u5206\u5224\u65ad\u54ea\u4e00\u534a\u4ecd\u7136\u6709\u5e8f\u3002\u5982\u679c <code>nums[left] &lt;= nums[mid]<\/code>\uff0c\u5de6\u534a\u6bb5\u6709\u5e8f\uff0c\u518d\u5224\u65ad target \u662f\u5426\u843d\u5728 <code>[nums[left], nums[mid])<\/code>\uff1b\u5426\u5219\u53bb\u53f3\u534a\u6bb5\u3002\u53f3\u534a\u6bb5\u540c\u7406\u3002\u91cd\u590d\u5143\u7d20\u4f1a\u8ba9\u6709\u5e8f\u534a\u6bb5\u5224\u65ad\u5931\u6548\uff0c\u6b64\u65f6\u53ef\u4ee5\u6536\u7f29\u8fb9\u754c\uff0c\u4f8b\u5982 <code>left++<\/code>\u3001<code>right--<\/code>\uff0c\u4f46\u8981\u8bf4\u660e\u6700\u574f\u65f6\u95f4\u4f1a\u9000\u5316\u5230 O(n)\u3002\u8fd9\u9898\u7684\u5173\u952e\u4e0d\u662f\u80cc\u6a21\u677f\uff0c\u800c\u662f\u6bcf\u6b21\u79fb\u52a8\u8fb9\u754c\u524d\u5148\u8bf4\u6e05\u695a\u4e3a\u4ec0\u4e48\u76ee\u6807\u4e0d\u5728\u88ab\u4e22\u6389\u7684\u533a\u95f4\u91cc\u3002<\/p>\n<h2>\u7b2c\u4e8c\u9762\uff1aJavaScript Coding\uff0cLRU Cache \u52a0\u8fc7\u671f\u65f6\u95f4<\/h2>\n<p><strong>\u9898\u76ee<\/strong>\uff1a\u5b9e\u73b0\u4e00\u4e2a LRU Cache\uff0c\u652f\u6301 <code>get(key)<\/code>\u3001<code>put(key, value, ttlMs)<\/code>\uff0c\u5bb9\u91cf\u6ee1\u65f6\u6dd8\u6c70\u6700\u8fd1\u6700\u5c11\u4f7f\u7528\u7684 key\uff1b\u8bfb\u53d6\u65f6\u5982\u679c\u6570\u636e\u5df2\u7ecf\u8fc7\u671f\uff0c\u4e5f\u8981\u5220\u9664\u5e76\u8fd4\u56de\u7a7a\u503c\u3002<\/p>\n<p><strong>\u89e3\u7b54\u601d\u8def<\/strong>\uff1a\u7528 <code>Map<\/code> \u4fdd\u5b58 key \u5230\u8282\u70b9\u7684\u6620\u5c04\uff0c\u518d\u7528\u53cc\u5411\u94fe\u8868\u7ef4\u62a4\u8bbf\u95ee\u987a\u5e8f\u3002<code>get<\/code> \u65f6\u5148\u68c0\u67e5\u8282\u70b9\u662f\u5426\u5b58\u5728\u548c\u662f\u5426\u8fc7\u671f\uff0c\u901a\u8fc7\u540e\u628a\u8282\u70b9\u79fb\u52a8\u5230\u94fe\u8868\u5934\u90e8\u3002<code>put<\/code> \u65f6\u5148\u5220\u9664\u540c\u540d\u65e7\u8282\u70b9\uff0c\u518d\u63d2\u5165\u65b0\u8282\u70b9\uff1b\u5bb9\u91cf\u8d85\u8fc7\u9650\u5236\u65f6\u4ece\u5c3e\u90e8\u6dd8\u6c70\u3002TTL \u4e0d\u8981\u9760\u5168\u91cf\u626b\u63cf\u89e3\u51b3\uff0c\u8bfb\u53d6\u548c\u5199\u5165\u8def\u5f84\u4e0a\u505a\u61d2\u5220\u9664\u5c31\u591f\uff0c\u540e\u7eed\u518d\u8865\u4e00\u4e2a\u540e\u53f0\u6e05\u7406\u4efb\u52a1\u3002<strong>\u590d\u6742\u5ea6<\/strong>\uff1a<code>get<\/code> \u548c <code>put<\/code> \u90fd\u662f O(1)\uff0c\u7a7a\u95f4 O(capacity)\u3002<\/p>\n<h2>\u7b2c\u4e09\u9762\uff1a\u7cfb\u7edf\u8bbe\u8ba1\uff0c\u5de5\u5355\u4e8b\u4ef6\u4e0e\u8ba2\u9605\u901a\u77e5\u670d\u52a1<\/h2>\n<p><strong>\u9898\u76ee<\/strong>\uff1a\u8bbe\u8ba1\u4e00\u4e2a\u5de5\u5355\u72b6\u6001\u6d41\u8f6c\u7cfb\u7edf\u3002\u7528\u6237\u521b\u5efa incident \u540e\uff0c\u7cfb\u7edf\u8981\u8bb0\u5f55\u72b6\u6001\u53d8\u66f4\u3001\u89e6\u53d1\u8ba2\u9605\u901a\u77e5\u3001\u652f\u6301\u6309\u7167\u670d\u52a1\u548c\u65f6\u95f4\u7a97\u53e3\u67e5\u8be2\u5386\u53f2\u4e8b\u4ef6\uff0c\u5e76\u4fdd\u8bc1\u901a\u77e5\u5931\u8d25\u540e\u53ef\u4ee5\u91cd\u8bd5\u3002<\/p>\n<p><strong>\u89e3\u7b54\u601d\u8def<\/strong>\uff1a\u5165\u53e3\u5c42\u5148\u505a\u9274\u6743\u548c\u5e42\u7b49\u6821\u9a8c\uff0c\u7528 <code>incident_id + event_id<\/code> \u9632\u6b62\u91cd\u590d\u5199\u5165\u3002\u4e8b\u4ef6\u5199\u5165\u4e3b\u5e93\u540e\u8fdb\u5165\u6d88\u606f\u961f\u5217\uff0c\u901a\u77e5\u670d\u52a1\u6309\u8ba2\u9605\u5173\u7cfb fan-out \u5230\u90ae\u4ef6\u3001Slack \u6216 webhook\u3002\u67e5\u8be2\u4fa7\u53ef\u4ee5\u628a\u4e8b\u4ef6\u6d41\u540c\u6b65\u5230\u6309 <code>service_id + time_bucket<\/code> \u5206\u533a\u7684\u5b58\u50a8\uff0c\u907f\u514d\u6240\u6709\u8bf7\u6c42\u6253\u5230\u4e8b\u52a1\u5e93\u3002\u5931\u8d25\u91cd\u8bd5\u8981\u6709\u9000\u907f\u7b56\u7565\u548c\u6b7b\u4fe1\u961f\u5217\uff0c\u901a\u77e5\u53d1\u9001\u72b6\u6001\u5355\u72ec\u8bb0\u5f55\uff0c\u4e0d\u8981\u963b\u585e\u5de5\u5355\u72b6\u6001\u66f4\u65b0\u3002\u9762\u8bd5\u5b98\u8ffd\u95ee\u4e00\u81f4\u6027\u65f6\uff0c\u53ef\u4ee5\u8bf4\u660e\u72b6\u6001\u6d41\u8f6c\u4ee5\u4e8b\u4ef6\u5199\u5165\u4e3a\u51c6\uff0c\u901a\u77e5\u662f\u6700\u7ec8\u4e00\u81f4\u3002<\/p>\n<h2>\u7b2c\u56db\u9762\uff1aBQ \u548c\u9879\u76ee\u6df1\u6316<\/h2>\n<p><strong>\u9898\u76ee<\/strong>\uff1a\u8bb2\u4e00\u4e2a\u4f60\u628a\u590d\u6742\u9700\u6c42\u62c6\u6210\u53ef\u4e0a\u7ebf\u7248\u672c\u7684\u9879\u76ee\u3002\u9762\u8bd5\u5b98\u7ee7\u7eed\u8ffd\u95ee\uff1a\u54ea\u4e9b\u529f\u80fd\u88ab\u5220\u6389\u4e86\uff0c\u600e\u4e48\u548c PM \u5bf9\u9f50\uff0c\u7ebf\u4e0a\u6307\u6807\u51fa\u4e86\u95ee\u9898\u600e\u4e48\u56de\u6eda\u3002<\/p>\n<p><strong>\u89e3\u7b54\u601d\u8def<\/strong>\uff1a\u56de\u7b54\u4e0d\u8981\u505c\u5728&quot;\u6211\u8d1f\u8d23\u540e\u7aef\u5f00\u53d1&quot;\u3002\u5148\u8bf4\u4e1a\u52a1\u76ee\u6807\uff0c\u518d\u62c6\u6210\u65f6\u95f4\u7ebf\uff1a\u9700\u6c42\u6536\u655b\u3001\u63a5\u53e3\u8bbe\u8ba1\u3001\u7070\u5ea6\u53d1\u5e03\u3001\u76d1\u63a7\u6307\u6807\u3001\u4e8b\u6545\u5904\u7406\u3002\u5220\u529f\u80fd\u65f6\u8981\u7ed9\u6807\u51c6\uff0c\u4f8b\u5982\u5f71\u54cd\u6838\u5fc3\u94fe\u8def\u3001\u4f9d\u8d56\u5916\u90e8\u56e2\u961f\u3001\u6d4b\u8bd5\u6210\u672c\u8fc7\u9ad8\u3002\u56de\u6eda\u65b9\u6848\u8981\u5177\u4f53\u5230\u5f00\u5173\u3001\u6570\u636e\u517c\u5bb9\u548c\u62a5\u8b66\u9608\u503c\u3002ServiceNow \u8fd9\u7c7b\u4f01\u4e1a\u8f6f\u4ef6\u9762\u8bd5\u5f88\u770b\u91cd\u5de5\u7a0b\u7a33\u5b9a\u6027\uff0c\u9879\u76ee\u6545\u4e8b\u91cc\u8981\u542c\u5f97\u51fa\u4f60\u600e\u4e48\u5904\u7406\u957f\u671f\u7ef4\u62a4\u3002<\/p>\n<h2>\u5907\u8003\u5efa\u8bae<\/h2>\n<p>ServiceNow VO \u4e0d\u9002\u5408\u53ea\u9760\u9898\u5e93\u7a81\u51fb\u3002Coding \u5148\u7ec3\u4e8c\u5206\u3001\u94fe\u8868\u3001\u54c8\u5e0c\u8868\u3001\u5806\u548c\u7f13\u5b58\u9898\uff0c\u518d\u8865 JavaScript \u91cc\u7684\u95ed\u5305\u3001Promise\u3001\u4e8b\u4ef6\u5faa\u73af\u548c\u5bf9\u8c61\u5f15\u7528\u3002\u7cfb\u7edf\u8bbe\u8ba1\u53ef\u4ee5\u51c6\u5907 incident\u3001workflow\u3001notification\u3001audit log \u8fd9\u4e9b\u4f01\u4e1a\u8f6f\u4ef6\u573a\u666f\uff0c\u628a\u8bfb\u5199\u8def\u5f84\u3001\u5931\u8d25\u91cd\u8bd5\u3001\u6743\u9650\u8fb9\u754c\u548c\u76d1\u63a7\u6307\u6807\u8bb2\u6210\u4e00\u6761\u7ebf\u3002\u9879\u76ee\u6df1\u6316\u63d0\u524d\u5199\u597d\u4e24\u6bb5\u7d20\u6750\uff1a\u4e00\u6b21\u6280\u672f\u53d6\u820d\uff0c\u4e00\u6b21\u7ebf\u4e0a\u95ee\u9898\u590d\u76d8\u3002<\/p>\n<h2>FAQ<\/h2>\n<h3>ServiceNow SWE VO \u8981\u91cd\u70b9\u51c6\u5907 JavaScript \u5417\uff1f<\/h3>\n<p>\u8981\u3002\u54ea\u6015\u5c97\u4f4d\u4e0d\u662f\u7eaf\u524d\u7aef\uff0cJavaScript\u3001Node.js\u3001React \u6216\u5f02\u6b65\u4efb\u52a1\u76f8\u5173\u8ffd\u95ee\u4e5f\u4f1a\u51fa\u73b0\u3002\u51c6\u5907\u65f6\u81f3\u5c11\u8981\u80fd\u89e3\u91ca\u4e8b\u4ef6\u5faa\u73af\u3001Promise \u94fe\u3001\u7f13\u5b58\u66f4\u65b0\u548c\u63a5\u53e3\u9519\u8bef\u5904\u7406\u3002<\/p>\n<h3>LRU Cache \u8fd9\u79cd\u9898\u600e\u4e48\u8bb2\u5f97\u66f4\u50cf\u5de5\u7a0b\u5b9e\u73b0\uff1f<\/h3>\n<p>\u4e0d\u8981\u53ea\u5199 <code>Map<\/code>\u3002\u628a\u5bb9\u91cf\u6dd8\u6c70\u3001\u8fc7\u671f\u5220\u9664\u3001\u5e76\u53d1\u8bbf\u95ee\u3001\u76d1\u63a7\u547d\u4e2d\u7387\u548c\u5185\u5b58\u4e0a\u9650\u4e00\u8d77\u8bb2\u51fa\u6765\uff0c\u9762\u8bd5\u5b98\u4f1a\u66f4\u5bb9\u6613\u770b\u5230\u5de5\u7a0b\u5224\u65ad\u3002<\/p>\n<h3>\u7cfb\u7edf\u8bbe\u8ba1\u9700\u8981\u8bb2\u5230\u5206\u5e03\u5f0f\u5f88\u6df1\u5417\uff1f<\/h3>\n<p>\u4e0d\u7528\u4e00\u5f00\u59cb\u5c31\u753b\u5f88\u91cd\u7684\u67b6\u6784\u3002\u5148\u628a\u6838\u5fc3\u5bf9\u8c61\u3001\u5199\u5165\u8def\u5f84\u3001\u67e5\u8be2\u8def\u5f84\u548c\u5931\u8d25\u91cd\u8bd5\u8bb2\u6e05\u695a\uff0c\u518d\u6839\u636e\u8ffd\u95ee\u52a0\u961f\u5217\u3001\u5206\u533a\u3001\u7f13\u5b58\u548c\u5e42\u7b49\u3002<\/p>\n<h2>\u53c2\u8003\u6765\u6e90<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.interviewquery.com\/interview-guides\/servicenow-software-engineer\" target=\"_blank\" rel=\"noopener\">ServiceNow Software Engineer Interview Questions + Guide<\/a><\/li>\n<li><a href=\"https:\/\/www.glassdoor.com\/Interview\/ServiceNow-Software-Engineer-Interview-Questions-EI_IE403326.0%2C10_KO11%2C28.htm\" target=\"_blank\" rel=\"noopener\">ServiceNow Software Engineer Interview Questions on Glassdoor<\/a><\/li>\n<li><a href=\"https:\/\/leetcode.com\/problems\/lru-cache\/\" target=\"_blank\" rel=\"noopener\">LeetCode 146. LRU Cache<\/a><\/li>\n<\/ul>\n<h2>\u5173\u4e8e CSOFFERPREP<\/h2>\n<p>\u8fdb VO \u4e4b\u524d\uff0c\u53ef\u4ee5\u627e CSOFFERPREP \u505a\u5b9e\u65f6\u9762\u8bd5\u52a9\u653b\u548c\u5907\u8003\u8f85\u5bfc\u3002CSOFFERPREP \u6df1\u8015\u5317\u7f8e IT \u884c\u4e1a\u591a\u5e74\uff0c\u5df2\u5e2e\u52a9\u4e07\u4f59\u540d\u5b66\u751f\u8fdb\u5165\u5168\u7403 500 \u5f3a\u4f01\u4e1a\u3002\u5bfc\u5e08\u6765\u81ea\u4e00\u7ebf\u5927\u5382\u8d44\u6df1\u5de5\u7a0b\u5e08\u548c\u9762\u8bd5\u5b98\uff0c\u5bf9 ServiceNow \u8fd9\u7c7b\u6ce8\u91cd\u5de5\u7a0b\u7a33\u5b9a\u6027\u7684\u516c\u53f8\u7684\u9762\u8bd5\u5957\u8def\u5f88\u719f\u6089\u3002\u65e0\u8bba\u662f OA\u8f85\u52a9\u3001OA \u8f85\u5bfc\u3001VO \u8f85\u52a9\u3001VO \u6a21\u62df\u9762\u8bd5\u3001VO \u8f85\u52a9\u8fd8\u662f\u7cfb\u7edf\u8bbe\u8ba1\u8f85\u52a9\uff0c\u90fd\u53ef\u4ee5\u83b7\u5f97\u66f4\u6709\u9488\u5bf9\u6027\u7684\u51c6\u5907\u65b9\u6848\uff1a<a href=\"https:\/\/csofferprep.com\/price\/\" target=\"_blank\" rel=\"noopener\">CSOFFERPREP \u00b7 \u670d\u52a1\u8be6\u60c5<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>ServiceNow SWE VO \u9762\u7ecf\u590d\u76d8\uff0c\u8986\u76d6 JavaScript Coding\u3001LRU Cache\u3001\u5de5\u5355\u4e8b\u4ef6\u7cfb\u7edf\u8bbe\u8ba1\u3001\u9879\u76ee\u6df1\u6316\u4e0e BQ \u51c6\u5907\u91cd\u70b9\u3002<\/p>","protected":false},"author":4,"featured_media":3367,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-3368","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-vo-2","resize-featured-image"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO Pro 4.9.9 - aioseo.com -->\n\t<meta name=\"description\" content=\"ServiceNow SWE VO \u9762\u7ecf\u590d\u76d8\uff0c\u8986\u76d6 JavaScript Coding\u3001LRU 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