{"id":528,"date":"2024-12-25T23:43:57","date_gmt":"2024-12-25T15:43:57","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=528"},"modified":"2024-12-25T23:43:57","modified_gmt":"2024-12-25T15:43:57","slug":"js%e6%95%b0%e6%8d%ae%e5%ba%93%e5%a6%82%e4%bd%95%e5%a4%84%e7%90%86%e5%a4%a7%e9%87%8f%e6%95%b0%e6%8d%ae","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2024\/12\/25\/js%e6%95%b0%e6%8d%ae%e5%ba%93%e5%a6%82%e4%bd%95%e5%a4%84%e7%90%86%e5%a4%a7%e9%87%8f%e6%95%b0%e6%8d%ae\/","title":{"rendered":"js\u6570\u636e\u5e93\u5982\u4f55\u5904\u7406\u5927\u91cf\u6570\u636e"},"content":{"rendered":"\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u5728 JavaScript \u4e2d\u5904\u7406\u5927\u91cf\u6570\u636e\u65f6\uff0c\u901a\u5e38\u4f1a\u7ed3\u5408\u524d\u7aef\u548c\u540e\u7aef\u7684\u6280\u672f\u6808\u6765\u5b9e\u73b0\u9ad8\u6548\u7684\u6570\u636e\u64cd\u4f5c\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u6838\u5fc3\u65b9\u6cd5\u548c\u6280\u672f\uff1a<\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">1. <strong>\u4f7f\u7528\u540e\u7aef\u6570\u636e\u5e93\u5904\u7406<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5bf9\u4e8e\u6d77\u91cf\u6570\u636e\uff0c\u901a\u5e38\u9700\u8981\u501f\u52a9\u540e\u7aef\u6570\u636e\u5e93\u8fdb\u884c\u5206\u62c5\uff0c\u524d\u7aef\u53ea\u52a0\u8f7d\u9700\u8981\u7684\u6570\u636e\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>SQL \u6570\u636e\u5e93<\/strong>\uff08\u5982 MySQL\u3001PostgreSQL\uff09<\/li>\n\n\n\n<li>\u4f7f\u7528\u7d22\u5f15\u4f18\u5316\u67e5\u8be2\u6027\u80fd\u3002<\/li>\n\n\n\n<li>\u4f7f\u7528\u5206\u9875\uff08<code>LIMIT<\/code> \u548c <code>OFFSET<\/code>\uff09\u52a0\u8f7d\u6570\u636e\u3002<\/li>\n\n\n\n<li>\u5bf9\u67e5\u8be2\u7ed3\u679c\u8fdb\u884c\u805a\u5408\u3001\u5206\u7ec4\uff0c\u51cf\u5c11\u524d\u7aef\u5904\u7406\u7684\u8d1f\u62c5\u3002<\/li>\n\n\n\n<li><strong>NoSQL \u6570\u636e\u5e93<\/strong>\uff08\u5982 MongoDB\u3001Redis\uff09<\/li>\n\n\n\n<li>\u9002\u5408\u5904\u7406\u975e\u7ed3\u6784\u5316\u6216\u5927\u89c4\u6a21\u6570\u636e\u3002<\/li>\n\n\n\n<li>\u4f7f\u7528\u5206\u7247\u548c\u5206\u533a\u6280\u672f\uff08\u5982 MongoDB \u7684 Sharding\uff09\u63d0\u5347\u6027\u80fd\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u793a\u4f8b\uff1a\u5206\u9875\u52a0\u8f7d<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT * FROM users ORDER BY created_at DESC LIMIT 100 OFFSET 0;<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2. <strong>\u524d\u7aef\u5206\u9875\u4e0e\u61d2\u52a0\u8f7d<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5c06\u6570\u636e\u6309\u9700\u52a0\u8f7d\u5230\u524d\u7aef\uff0c\u907f\u514d\u4e00\u6b21\u6027\u52a0\u8f7d\u6240\u6709\u6570\u636e\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u61d2\u52a0\u8f7d<\/strong>\uff08Lazy Loading\uff09\uff1a\u53ea\u52a0\u8f7d\u7528\u6237\u5f53\u524d\u9700\u8981\u7684\u90e8\u5206\u6570\u636e\u3002<\/li>\n\n\n\n<li><strong>\u65e0\u9650\u6eda\u52a8<\/strong>\uff08Infinite Scroll\uff09\uff1a\u7528\u6237\u6eda\u52a8\u9875\u9762\u65f6\u52a8\u6001\u52a0\u8f7d\u4e0b\u4e00\u90e8\u5206\u6570\u636e\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u793a\u4f8b\uff1a\u4f7f\u7528 Fetch \u52a0\u8f7d\u6570\u636e<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>let currentPage = 1;\n\nasync function loadMoreData() {\n  const response = await fetch(`\/api\/data?page=${currentPage}`);\n  const data = await response.json();\n  renderData(data);\n  currentPage++;\n}<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3. <strong>Web Worker \u5b9e\u73b0\u5f02\u6b65\u5904\u7406<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u524d\u7aef\u5927\u91cf\u6570\u636e\u64cd\u4f5c\uff08\u5982\u7b5b\u9009\u3001\u6392\u5e8f\u3001\u5927\u578b\u8fd0\u7b97\uff09\u53ef\u80fd\u4f1a\u963b\u585e\u4e3b\u7ebf\u7a0b\uff0c\u5f71\u54cd\u7528\u6237\u4f53\u9a8c\u3002\u53ef\u4ee5\u4f7f\u7528 Web Worker \u5c06\u4efb\u52a1\u79fb\u5230\u540e\u53f0\u7ebf\u7a0b\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u793a\u4f8b\uff1a\u4f7f\u7528 Web Worker<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ worker.js\nself.onmessage = function (event) {\n  const result = event.data.filter(item =&gt; item.value &gt; 10);\n  postMessage(result);\n};\n\n\/\/ main.js\nconst worker = new Worker('worker.js');\nworker.postMessage(largeDataArray);\nworker.onmessage = function (event) {\n  console.log('Filtered Data:', event.data);\n};<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">4. <strong>\u6570\u636e\u7684\u672c\u5730\u5b58\u50a8\u4e0e\u5904\u7406<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5bf9\u4e8e\u9700\u8981\u79bb\u7ebf\u5b58\u50a8\u6216\u7f13\u5b58\u7684\u6570\u636e\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>IndexedDB<\/strong>\uff1a\u9002\u5408\u5b58\u50a8\u548c\u67e5\u8be2\u5927\u91cf\u7ed3\u6784\u5316\u6570\u636e\u3002<\/li>\n\n\n\n<li><strong>LocalStorage \/ SessionStorage<\/strong>\uff1a\u9002\u5408\u5b58\u50a8\u5c11\u91cf\u8f7b\u91cf\u7ea7\u6570\u636e\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u793a\u4f8b\uff1a\u4f7f\u7528 IndexedDB<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>const request = indexedDB.open('myDatabase', 1);\n\nrequest.onsuccess = function (event) {\n  const db = event.target.result;\n  const transaction = db.transaction(&#91;'storeName'], 'readonly');\n  const store = transaction.objectStore('storeName');\n  const getAllRequest = store.getAll();\n\n  getAllRequest.onsuccess = function () {\n    console.log(getAllRequest.result);\n  };\n};<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">5. <strong>\u6279\u91cf\u5904\u7406\u4e0e\u5206\u5757<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5bf9\u4e8e\u5904\u7406\u6d77\u91cf\u6570\u636e\u65f6\uff0c\u53ef\u4ee5\u5c06\u6570\u636e\u5206\u5757\u5904\u7406\uff0c\u907f\u514d\u4e00\u6b21\u6027\u64cd\u4f5c\u8017\u5c3d\u8d44\u6e90\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5206\u5757\uff08Chunking\uff09\uff1a\u5c06\u5927\u6570\u7ec4\u5206\u6210\u5c0f\u5757\uff0c\u9010\u5757\u5904\u7406\u3002<\/li>\n\n\n\n<li><strong>Streams<\/strong>\uff1a\u5904\u7406\u6570\u636e\u6d41\uff0c\u9002\u5408\u5904\u7406\u6587\u4ef6\u6216\u7f51\u7edc\u4f20\u8f93\u4e2d\u7684\u5927\u91cf\u6570\u636e\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u793a\u4f8b\uff1a\u5206\u5757\u5904\u7406\u6570\u636e<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>function processLargeArray(data) {\n  const chunkSize = 1000;\n  for (let i = 0; i &lt; data.length; i += chunkSize) {\n    const chunk = data.slice(i, i + chunkSize);\n    processChunk(chunk);\n  }\n}\n\nfunction processChunk(chunk) {\n  console.log('Processing chunk:', chunk);\n}<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">6. <strong>\u524d\u7aef\u865a\u62df\u5316\u6280\u672f<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53\u9700\u8981\u5728\u524d\u7aef\u5c55\u793a\u5927\u91cf\u6570\u636e\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528\u865a\u62df\u6eda\u52a8\u6280\u672f\uff08Virtual Scrolling\uff09\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4ec5\u6e32\u67d3\u53ef\u89c6\u533a\u57df\u7684\u6570\u636e\uff0c\u672a\u663e\u793a\u7684\u6570\u636e\u4e0d\u4f1a\u52a0\u8f7d\u5230 DOM \u4e2d\u3002<\/li>\n\n\n\n<li><strong>\u5de5\u5177\u5e93<\/strong>\uff1a<\/li>\n\n\n\n<li><a href=\"https:\/\/github.com\/bvaughn\/react-virtualized\">React Virtualized<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/github.com\/Akryum\/vue-virtual-scroller\">Vue Virtual Scroller<\/a><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">7. <strong>\u6027\u80fd\u4f18\u5316\u5de5\u5177<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u6570\u636e\u5e93\u5c42\u4f18\u5316<\/strong>\uff1a\u4f7f\u7528\u7d22\u5f15\u3001\u7f13\u5b58\u3001\u5206\u533a\u8868\u3002<\/li>\n\n\n\n<li><strong>\u7f13\u5b58\u673a\u5236<\/strong>\uff1a\u7ed3\u5408 Redis \u6216 Memcached \u7f13\u5b58\u70ed\u70b9\u6570\u636e\u3002<\/li>\n\n\n\n<li><strong>\u8d1f\u8f7d\u5747\u8861<\/strong>\uff1a\u5bf9\u4e8e\u9ad8\u5e76\u53d1\u8bf7\u6c42\uff0c\u5c06\u4efb\u52a1\u5206\u6563\u5230\u591a\u53f0\u670d\u52a1\u5668\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u603b\u7ed3<\/strong><br>\u5904\u7406\u5927\u91cf\u6570\u636e\u65f6\uff0c\u7ed3\u5408\u540e\u7aef\u6570\u636e\u5e93\u4f18\u5316\u4e0e\u524d\u7aef\u61d2\u52a0\u8f7d\u6280\u672f\uff0c\u5e76\u5229\u7528 Web Worker \u6216\u865a\u62df\u5316\u6280\u672f\u63d0\u5347\u7528\u6237\u4f53\u9a8c\u3002\u9009\u62e9\u5177\u4f53\u65b9\u6cd5\u65f6\u9700\u6839\u636e\u6570\u636e\u89c4\u6a21\u3001\u64cd\u4f5c\u573a\u666f\u548c\u7528\u6237\u9700\u6c42\u505a\u6743\u8861\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 JavaScript \u4e2d\u5904\u7406\u5927\u91cf\u6570\u636e\u65f6\uff0c\u901a\u5e38\u4f1a\u7ed3\u5408\u524d\u7aef\u548c\u540e\u7aef\u7684\u6280\u672f\u6808\u6765\u5b9e\u73b0\u9ad8\u6548\u7684\u6570\u636e\u64cd\u4f5c\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u6838\u5fc3\u65b9 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[72],"tags":[],"class_list":["post-528","post","type-post","status-publish","format-standard","hentry","category-nosql"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/528","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=528"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/528\/revisions"}],"predecessor-version":[{"id":529,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/528\/revisions\/529"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=528"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=528"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=528"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}