{"id":12155,"date":"2026-04-13T16:01:51","date_gmt":"2026-04-13T08:01:51","guid":{"rendered":"https:\/\/www.zhangxinxu.com\/wordpress\/?p=12155"},"modified":"2026-04-13T16:01:51","modified_gmt":"2026-04-13T08:01:51","slug":"js-weakref","status":"publish","type":"post","link":"https:\/\/www.zhangxinxu.com\/wordpress\/2026\/04\/js-weakref\/","title":{"rendered":"\u52a1\u5fc5\u8c28\u614e\u4f7f\u7528JS WeakRef\u5f31\u5f15\u7528"},"content":{"rendered":"<p>by <a href=\"https:\/\/www.zhangxinxu.com\/\">zhangxinxu<\/a> from <a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/?p=12155\">https:\/\/www.zhangxinxu.com\/wordpress\/?p=12155<\/a><br \/>\n\u672c\u6587\u53ef\u5168\u6587\u8f6c\u8f7d\uff0c\u4f46\u9700\u8981\u4fdd\u7559\u539f\u4f5c\u8005\u3001\u51fa\u5904\u4ee5\u53ca\u6587\u4e2d\u94fe\u63a5\uff0cAI\u6293\u53d6\u4fdd\u7559\u539f\u6587\u5730\u5740\uff0c\u4efb\u4f55\u7f51\u7ad9\u5747\u53ef\u6458\u8981\u805a\u5408\uff0c\u5546\u7528\u8bf7\u8054\u7cfb\u6388\u6743\u3002<\/p>\n<h3>\u4e00\u3001weak\u4e09\u5251\u5ba2<\/h3>\n<p>JS\u8bed\u8a00\u4e2d\u7684\u5f31\u7c7b\u578b\u9664\u4e86\u672c\u6587\u8981\u4ecb\u7ecd\u7684WeakRef\uff0c\u8fd8\u6709WeakMap\u548cWeakSet\uff0c\u5176\u4e2dWeakMap\u62115\u5e74\u524d\u6709\u4ecb\u7ecd\u8fc7\uff0c\u53c2\u89c1\u201c<a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/2021\/08\/js-weakmap-es6\/\">JS WeakMap\u5e94\u8be5\u4ec0\u4e48\u65f6\u5019\u4f7f\u7528<\/a>\u201d\u3002<\/p>\n<p>WeakMap\u548cWeakSet\u652f\u6301\u5f88\u591a\u5f88\u591a\u5e74\u4e86\uff0c\u65e0\u9700\u987e\u5fcc\u4efb\u4f55\u517c\u5bb9\u6027\u95ee\u9898\uff0c\u4f46\u662fWeakRef\u5219\u662f\u524d\u51e0\u5e74\u521a\u652f\u6301\u7684\u7279\u6027\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202604\/2026-4-13_112142.png\" width=\"657\" height=\"241\" alt=\"WeakRef\u7684\u517c\u5bb9\u6027\" class=\"alignnone size-medium\" \/><\/p>\n<h4>\u4e09\u8005\u7684\u672c\u8d28\u533a\u522b<\/h4>\n<p>\u7528\u4e00\u53e5\u8bdd\u8bf4\u660eWeakMap\u3001WeakSet\u548cWeakRef\u7684\u533a\u522b\uff0c\u90a3\u5c31\u662f\uff1a<\/p>\n<p>WeakMap \u548c WeakSet \u662f\u96c6\u5408\u7c7b\u6570\u636e\u7ed3\u6784\uff0c\u5f31\u5f15\u7528\u662f\u5b83\u4eec\u7ba1\u7406\u6210\u5458\u7684\u65b9\u5f0f\uff1bWeakRef \u662f\u5bf9\u5355\u4e2a\u5bf9\u8c61\u7684\u5f31\u5f15\u7528\u5305\u88c5\u5668\uff0c\u8ba9\u4f60\u80fd\u4e3b\u52a8\u68c0\u67e5\u5bf9\u8c61\u662f\u5426\u8fd8\u6d3b\u7740\u3002<\/p>\n<p>\u7528\u66f4\u52a0\u901a\u4fd7\u7684\u8bdd\u89e3\u91ca\u5c31\u662f\uff1a<\/p>\n<ul>\n<li><strong>WeakMap\uff1a<\/strong>\u6211\u60f3\u7ed9\u5bf9\u8c61\u8d34\u6807\u7b7e\/\u5b58\u6570\u636e\uff0c\u4f46\u4e0d\u963b\u6b62\u5b83\u88ab\u56de\u6536<\/li>\n<li><strong>WeakSet\uff1a<\/strong>\u6211\u60f3\u8bb0\u4f4f\u54ea\u4e9b\u5bf9\u8c61\u51fa\u73b0\u8fc7\uff0c\u4f46\u4e0d\u963b\u6b62\u5b83\u4eec\u88ab\u56de\u6536<\/li>\n<li><strong>WeakRef\uff1a<\/strong>\u6211\u60f3\u4fdd\u7559\u4e00\u4e2a\u5bf9\u8c61\u7684\u5f15\u7528\uff0c\u4f46\u5141\u8bb8\u5b83\u968f\u65f6\u88ab\u56de\u6536\uff0c\u7528\u65f6\u518d\u68c0\u67e5<\/li>\n<\/ul>\n<p>\u4e0b\u9762\u6848\u4f8b\u65f6\u523b\uff1a<\/p>\n<p><strong>1. WeakMap \u2014\u2014 \u4ee5\u5bf9\u8c61\u4e3a\u952e\u7684\u952e\u503c\u6620\u5c04<\/strong><\/p>\n<pre>const wm = new WeakMap();\r\nlet obj = { name: 'Alice' };\r\n\r\nwm.set(obj, '\u989d\u5916\u6570\u636e');   \/\/ \u952e\u5fc5\u987b\u662f\u5bf9\u8c61\r\nconsole.log(wm.get(obj));  \/\/ '\u989d\u5916\u6570\u636e'\r\n\r\nobj = null; \/\/ obj \u88ab\u56de\u6536\u540e\uff0cWeakMap \u4e2d\u5bf9\u5e94\u7684\u6761\u76ee\u4e5f\u4f1a\u81ea\u52a8\u6d88\u5931<\/pre>\n<p><strong>\u8865\u5145\u8bf4\u660e\uff1a<\/strong><\/p>\n<ul>\n<li>\u952e<strong>\u5fc5\u987b<\/strong>\u662f\u5bf9\u8c61\uff08\u4e0d\u80fd\u662f\u539f\u59cb\u503c\uff09<\/li>\n<li>\u503c\u53ef\u4ee5\u662f\u4efb\u610f\u7c7b\u578b<\/li>\n<li>\u5f53\u952e\u5bf9\u8c61\u6ca1\u6709\u5176\u4ed6\u5f15\u7528\u65f6\uff0c\u952e\u503c\u5bf9\u4f1a\u88ab GC \u81ea\u52a8\u56de\u6536<\/li>\n<li>\u5e38\u7528\u4e8e\uff1aDOM \u8282\u70b9\u5173\u8054\u6570\u636e\u3001\u7c7b\u7684\u79c1\u6709\u6570\u636e\u5b58\u50a8<\/li>\n<\/ul>\n<p><strong>2. WeakSet \u2014\u2014 \u5bf9\u8c61\u7684\u5f31\u5f15\u7528\u96c6\u5408<\/strong><\/p>\n<pre>const ws = new WeakSet();\r\nlet obj = { id: 1 };\r\n\r\nws.add(obj);              \/\/ \u53ea\u80fd\u6dfb\u52a0\u5bf9\u8c61\r\nconsole.log(ws.has(obj)); \/\/ true\r\n\r\nobj = null; \/\/ obj \u88ab\u56de\u6536\u540e\uff0cWeakSet \u4e2d\u7684\u6761\u76ee\u4e5f\u81ea\u52a8\u6d88\u5931<\/pre>\n<p><strong>\u8865\u5145\u8bf4\u660e\uff1a<\/strong><\/p>\n<ul dir=\"auto\">\n<li>\u53ea\u80fd\u5b58\u50a8<strong>\u5bf9\u8c61<\/strong>\uff0c\u4e0d\u80fd\u5b58\u539f\u59cb\u503c<\/li>\n<li>\u53ea\u6709 <code class=\"notranslate\">add<\/code>\u3001<code class=\"notranslate\">has<\/code>\u3001<code class=\"notranslate\">delete<\/code> \u4e09\u4e2a\u65b9\u6cd5<\/li>\n<li>\u5e38\u7528\u4e8e\uff1a\u6807\u8bb0\u5bf9\u8c61\u662f\u5426&#8221;\u5df2\u8bbf\u95ee&#8221;\u3001&#8221;\u5df2\u5904\u7406&#8221;\u3001\u9632\u6b62\u5faa\u73af\u5f15\u7528<\/li>\n<\/ul>\n<p><strong>3. WeakRef \u2014\u2014 \u5bf9\u5355\u4e2a\u5bf9\u8c61\u7684\u5f31\u5f15\u7528<\/strong><\/p>\n<pre>let obj = { data: 'heavy resource' };\r\nconst ref = new WeakRef(obj);\r\n\r\n\/\/ \u901a\u8fc7 .deref() \u83b7\u53d6\u76ee\u6807\u5bf9\u8c61\r\nconsole.log(ref.deref());        \/\/ { data: 'heavy resource' }\r\nconsole.log(ref.deref()?.data);  \/\/ 'heavy resource'\r\n\r\nobj = null;\r\n\/\/ \u67d0\u6b21 GC \u4e4b\u540e...\r\nconsole.log(ref.deref()); \/\/ undefined\uff08\u5bf9\u8c61\u5df2\u88ab\u56de\u6536\uff09<\/pre>\n<p><strong>\u8981\u70b9\u8bf4\u660e\uff1a<\/strong><\/p>\n<ul dir=\"auto\">\n<li>\u5305\u88c5<strong>\u5355\u4e2a\u5bf9\u8c61<\/strong>\uff0c\u4e0d\u662f\u96c6\u5408<\/li>\n<li>\u901a\u8fc7 <code class=\"notranslate\">.deref()<\/code> \u53d6\u56de\u5bf9\u8c61\uff0c\u5982\u679c\u5df2\u88ab GC \u56de\u6536\u5219\u8fd4\u56de <code class=\"notranslate\">undefined<\/code><\/li>\n<li>\u901a\u5e38\u642d\u914d <code class=\"notranslate\">FinalizationRegistry<\/code> \u4f7f\u7528\uff0c\u5728\u5bf9\u8c61\u88ab\u56de\u6536\u65f6\u6267\u884c\u6e05\u7406\u56de\u8c03<\/li>\n<li>\u5e38\u7528\u4e8e\uff1a\u7f13\u5b58\uff08\u5bf9\u8c61\u5728\u5219\u547d\u4e2d\u7f13\u5b58\uff0c\u88ab\u56de\u6536\u5219\u91cd\u65b0\u521b\u5efa\uff09<\/li>\n<\/ul>\n<h3>\u4e8c\u3001JS WeakRef \u5f31\u5f15\u7528\u7ecf\u5178\u6848\u4f8b<\/h3>\n<p>\u5217\u4e3e\u51e0\u4e2a\u9002\u5408\u4f7f\u7528JS WeakRef\u7684\u573a\u666f\uff0c\u5e0c\u671b\u53ef\u4ee5\u8ba9\u5927\u5bb6\u5bf9WeakRef\u7684\u4f5c\u7528\u6709\u66f4\u52a0\u6df1\u523b\u7684\u7406\u89e3\u3002<\/p>\n<h4>1. \u7f13\u5b58\u573a\u666f<\/h4>\n<pre>const cache = new Map();\r\n\r\nfunction getCached(key, createFn) {\r\n  const ref = cache.get(key);\r\n  const cached = ref?.deref();\r\n\r\n  if (cached) return cached; \/\/ \u7f13\u5b58\u547d\u4e2d\r\n\r\n  \/\/ \u7f13\u5b58\u672a\u547d\u4e2d\u6216\u5df2\u88ab GC \u56de\u6536\uff0c\u91cd\u65b0\u521b\u5efa\r\n  const newObj = createFn();\r\n  cache.set(key, new WeakRef(newObj));\r\n  return newObj;\r\n}<\/pre>\n<p>\u8fd9\u91cc WeakRef \u5141\u8bb8\u7f13\u5b58\u7684\u5927\u5bf9\u8c61\u5728\u5185\u5b58\u7d27\u5f20\u65f6\u88ab\u81ea\u52a8\u56de\u6536\uff0c\u907f\u514d\u5185\u5b58\u6cc4\u6f0f\uff0c\u4e2a\u4eba\u89c2\u70b9\uff0c\u7f13\u5b58\u5904\u7406\u662fWeakRef\u6700\u5177\u4ee3\u8868\u6027\u7684\u5e94\u7528\u573a\u666f\u3002<\/p>\n<h4>2.  DOM \u5143\u7d20\u4e0d\u6cc4\u6f0f\u7684\u4e34\u65f6\u5f15\u7528<\/h4>\n<p>\u5148\u770bDOM\u5143\u7d20\u5220\u9664\uff0c\u4f46\u662f\u5185\u5b58\u4f9d\u7136\u5360\u7528\u7684\u4f8b\u5b50\uff1a<\/p>\n<pre>\/\/ \u5178\u578b\u6cc4\u6f0f\u573a\u666f\uff1aDOM \u8282\u70b9\u5df2\u4ece\u9875\u9762\u79fb\u9664\uff0c\u4f46 JS \u4ecd\u6301\u6709\u5f3a\u5f15\u7528\r\nconst detachedNodes = [];\r\n\r\nfunction addItem() {\r\n  const div = document.createElement('div');\r\n  document.body.appendChild(div);\r\n  detachedNodes.push(div); \/\/ \u5f3a\u5f15\u7528\r\n}\r\n\r\nfunction removeItem(div) {\r\n  document.body.removeChild(div);\r\n  \/\/ \u867d\u7136\u4ece DOM \u6811\u79fb\u9664\u4e86\uff0c\u4f46 detachedNodes \u6570\u7ec4\u8fd8\u5f15\u7528\u7740\u5b83\r\n  \/\/ \u2192 GC \u65e0\u6cd5\u56de\u6536 \u2192 \u5185\u5b58\u6cc4\u6f0f\uff01\r\n}<\/pre>\n<p>WeakRef\u53ef\u4ee5\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff1a<\/p>\n<pre>const nodeRefs = [];\r\n\r\nfunction addItem() {\r\n  const div = document.createElement('div');\r\n  document.body.appendChild(div);\r\n  nodeRefs.push(new WeakRef(div)); \/\/ \u5f31\u5f15\u7528\uff0c\u4e0d\u963b\u6b62 GC\r\n}\r\n\r\nfunction doSomethingWithNodes() {\r\n  for (const ref of nodeRefs) {\r\n    const node = ref.deref();\r\n    if (node) {\r\n      \/\/ \u8282\u70b9\u8fd8\u6d3b\u7740\uff0c\u6b63\u5e38\u64cd\u4f5c\r\n      node.style.color = 'red';\r\n    } else {\r\n      \/\/ \u8282\u70b9\u5df2\u88ab GC \u56de\u6536\uff0c\u8df3\u8fc7\r\n    }\r\n  }\r\n}<\/pre>\n<p>\u5f53 DOM \u8282\u70b9\u4ece\u6587\u6863\u4e2d\u79fb\u9664\u4e14\u6ca1\u6709\u5176\u4ed6\u5f3a\u5f15\u7528\u65f6\uff0cWeakRef \u4e0d\u4f1a\u963b\u6b62 GC \u56de\u6536\u5b83\u3002<\/p>\n<p>\u4f46\u662f\uff0c\u867d\u7136WeakRef\u6709\u907f\u514dDOM\u5185\u5b58\u6cc4\u9732\u7684\u80fd\u529b\uff0c\u4f46\u6211\u4e2a\u4eba\u89c9\u5f97\u4e0d\u63a8\u8350\u8fd9\u4e48\u4f7f\u7528\uff0c\u539f\u56e0\u540e\u9762\u4f1a\u89e3\u91ca\u3002<\/p>\n<h4>3. \u4e8b\u4ef6\u76d1\u542c + \u4e0d\u963b\u6b62 GC<\/h4>\n<p>\u6709\u5185\u5b58\u95ee\u9898\u7684\u4ee3\u7801\u793a\u610f\uff1a<\/p>\n<pre>\/\/ \u274c \u6cc4\u6f0f\uff1a\u95ed\u5305\u6301\u6709 DOM \u5f15\u7528\uff0c\u4e14\u76d1\u542c\u5668\u672a\u6e05\u7406\r\nfunction setup() {\r\n  const el = document.getElementById('target');\r\n  window.addEventListener('resize', () =&gt; {\r\n    el.style.width = '100%'; \/\/ el \u88ab\u95ed\u5305\u6355\u83b7\uff0c\u6c38\u8fdc\u65e0\u6cd5\u56de\u6536\r\n  });\r\n}<\/pre>\n<p>\u5982\u679c\u4f7f\u7528WeakRef\uff1a<\/p>\n<pre>function setup() {\r\n  const ref = new WeakRef(document.getElementById('target'));\r\n  window.addEventListener('resize', () =&gt; {\r\n    const el = ref.deref();\r\n    if (!el) return; \/\/ \u5bf9\u8c61\u6ca1\u4e86\uff0c\u76f4\u63a5\u8df3\u8fc7\r\n    el.style.width = '100%';\r\n  });\r\n}<\/pre>\n<p>\u8fd8\u662f\u90a3\u53e5\u8bdd\uff0c\u8fd9\u91cc\u5176\u5b9e\u4f7f\u7528<a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/2023\/01\/fetch-abortcontroller-abort-fetch-axios\/\">AbortController<\/a>\u4e3b\u52a8\u79fb\u51fa\u76d1\u542c\u5668\u662f\u66f4\u597d\u7684\u505a\u6cd5\u3002<\/p>\n<h4>4. \u7ec4\u4ef6\u5b9e\u4f8b\u6c60 \/ \u5bf9\u8c61\u6c60\uff08\u590d\u7528\u4f46\u4e0d\u6cc4\u6f0f\uff09<\/h4>\n<p>\u6bd4\u65b9\u8bf4\u4e0b\u9762\u8fd9\u6bb5\u4ee3\u7801\uff0c\u5bf9\u8c61\u9500\u6bc1\u540e\u81ea\u52a8\u4ece\u6c60\u5b50\u91cc \u201c\u6d88\u5931\u201d\uff0c\u4e0d\u7528\u624b\u52a8\u6e05\u7406\u3002<\/p>\n<pre>const pool = new Set();\r\n\r\nfunction addToPool(obj) {\r\n  pool.add(new WeakRef(obj));\r\n}\r\n\r\nfunction foreachActive(cb) {\r\n  for (const ref of pool) {\r\n    const obj = ref.deref();\r\n    if (obj) cb(obj);\r\n    else pool.delete(ref);\r\n  }\r\n}<\/pre>\n<h4>5. \u9632\u6b62\u5faa\u73af\u5f15\u7528\u5bfc\u81f4\u7684\u5185\u5b58\u6cc4\u6f0f<\/h4>\n<p>\u8fd9\u4e2a\u6848\u4f8b\u4e2d\u7236 \u2194 \u5b50\u4e92\u76f8\u5f15\u7528\uff0c\u4f46\u662f\u7531\u4e8e\u4f7f\u7528\u4e86WeakRef\uff0c\u6253\u7834\u4e86\u5f3a\u5f15\u7528\u94fe\uff0cGC \u80fd\u6b63\u5e38\u5de5\u4f5c\uff0c\u5185\u5b58\u4e0d\u4f1a\u6cc4\u9732\u3002<\/p>\n<pre>class Parent {\r\n  constructor() {\r\n    this.child = null;\r\n  }\r\n}\r\n\r\nclass Child {\r\n  constructor(parent) {\r\n    this.parentRef = new WeakRef(parent); \/\/ \u5f31\u5f15\u7528\r\n  }\r\n}\r\n\r\nconst p = new Parent();\r\nconst c = new Child(p);\r\np.child = c;<\/pre>\n<p>OK\uff0c\u867d\u7136\u4e0a\u9762\u5c55\u793a\u4e86\u5f88\u591a\u53ef\u4ee5\u4f7f\u7528WeakRef\u7684\u573a\u666f\uff0c\u4f46\u662f\u8fd9\u4e9b\u5904\u7406\u624b\u6bb5\u90fd\u4e0d\u63a8\u8350\uff08\u9664\u4e86\u7b2c\u4e00\u4e2a\u573a\u666f\uff09\uff0c\u53ea\u80fd\u4f5c\u4e3a\u907f\u514d\u5185\u5b58\u6cc4\u6f0f\u7684\u6700\u540e\u624b\u6bb5\u3002<\/p>\n<h3>\u4e09\u3001\u8c28\u614e\u4f7f\u7528WeakRef<\/h3>\n<p>\u4e3a\u4ec0\u4e48\u8981\u8c28\u614e\u4f7f\u7528WeakRef\uff1f\u6700\u91cd\u8981\u7684\u539f\u56e0\u5176\u5b9e\u4e5f\u5c31\u56db\u4e2a\u5b57\u2014\u2014\u201c\u4e0d\u53ef\u9884\u6d4b\u201d\uff01<\/p>\n<p>\u5783\u573e\u6536\u96c6\u4f55\u65f6\u3001\u5982\u4f55\u4ee5\u53ca\u662f\u5426\u53d1\u751f\uff0c\u53d6\u51b3\u4e8e\u4efb\u4f55\u7ed9\u5b9aJavaScript\u5f15\u64ce\u7684\u5b9e\u73b0\u3002\u4f60\u5728\u4e00\u4e2a\u5f15\u64ce\u4e2d\u89c2\u5bdf\u5230\u7684\u4efb\u4f55\u884c\u4e3a\uff0c\u5728\u53e6\u4e00\u4e2a\u5f15\u64ce\u4e2d\u3001\u5728\u540c\u4e00\u5f15\u64ce\u7684\u53e6\u4e00\u4e2a\u7248\u672c\u4e2d\uff0c\u751a\u81f3\u5728\u76f8\u540c\u5f15\u64ce\u7684\u76f8\u540c\u7248\u672c\u4f46\u5728\u7a0d\u6709\u4e0d\u540c\u7684\u60c5\u51b5\u4e0b\uff0c\u90fd\u53ef\u80fd\u4f1a\u6709\u6240\u4e0d\u540c\u3002<\/p>\n<p>\u6bd4\u65b9\u8bf4\u67d0\u4e2a\u5185\u5b58\uff0c\u4f60\u660e\u660e\u60f3\u8981\u4f7f\u7528\uff0c\u4f46\u662f\u5374\u88ab\u56de\u6536\u4e86\uff0c\u8fd9\u5c31\u5f88\u70e6\u4eba\u3002<\/p>\n<p>\u6211\u4e4b\u524d\u5f00\u53d1\u5c31\u9047\u5230\u8fc7\uff0c\u5927\u6570\u636e\u91cf\u7684\u89c6\u9891buffer\u6570\u636e\uff0c\u6700\u7ec8\u89c6\u9891\u5408\u6210\u7684\u65f6\u5019\u83ab\u540d\u4e22\u5931\u4e86\uff0c\u4f7f\u5f97\u6211\u4e0d\u5f97\u4e0d\u4e00\u5f00\u59cb\u7684\u65f6\u5019\u5f3a\u5f15\u7528\uff0c\u5f53\u65f6\u6211\u4e5f\u662f\u6ca1\u6709\u641e\u61c2\u6d4f\u89c8\u5668\u5f15\u64ce\u7684\u56de\u6536\u673a\u5236\uff0c\u6839\u636e\u67e5\u9605\u8d44\u6599\u7684\u8bf4\u6cd5\uff0c\u5c31\u662f\u5185\u5b58\u4e0d\u8db3\u7684\u65f6\u5019\uff0c\u67d0\u4e9b\u672a\u88ab\u5f3a\u5f15\u7528\u7684\u5de8\u5927\u53d8\u91cf\u4f1a\u88ab\u56de\u6536\uff0c\u5373\u4f7f\u8fd9\u4e2a\u53d8\u91cf\u6700\u540e\u9700\u8981\u4f7f\u7528\u3002<\/p>\n<p>\u53c8\u6bd4\u5982\u8bf4\uff0c\u4f60\u4e00\u4f4d\u5185\u5b58\u5df2\u7ecf\u88ab\u6e05\u7406\u4e86\uff0c\u53ef\u5b9e\u9645\u4e0a\u5185\u5b58\u6e05\u7406\u5de5\u4f5c\u53ef\u80fd\u4f1a\u6bd4\u9884\u671f\u665a\u5f97\u591a\u624d\u8fdb\u884c\uff0c\u6216\u8005\u6839\u672c\u4e0d\u4f1a\u8fdb\u884c\u3002<\/p>\n<p>\u56e0\u4e3aJavaScript \u5f15\u64ce\u7684\u5185\u5b58\u56de\u6536\u673a\u5236\u6781\u4e3a\u590d\u6742\uff1a<\/p>\n<ul>\n<li>\u5373\u4f7f\u4e24\u4e2a\u5bf9\u8c61\u540c\u65f6\u53d8\u5f97\u65e0\u6cd5\u8bbf\u95ee\uff08\u4f8b\u5982\uff0c\u7531\u4e8e\u5206\u4ee3\u6536\u96c6\uff09\uff0c\u4e00\u4e2a\u5bf9\u8c61\u53ef\u80fd\u6bd4\u53e6\u4e00\u4e2a\u5bf9\u8c61\u66f4\u65e9\u5730\u88ab\u5783\u573e\u6536\u96c6\u3002<\/li>\n<li>\u5783\u573e\u6536\u96c6\u5de5\u4f5c\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528\u589e\u91cf\u548c\u5e76\u53d1\u6280\u672f\u6765\u5206\u65f6\u6bb5\u8fdb\u884c\u3002<\/li>\n<li>\u53ef\u4ee5\u4f7f\u7528\u5404\u79cd\u8fd0\u884c\u65f6\u542f\u53d1\u5f0f\u7b97\u6cd5\u6765\u5e73\u8861\u5185\u5b58\u4f7f\u7528\u548c\u54cd\u5e94\u6027\u3002<\/li>\n<li>JavaScript \u5f15\u64ce\u53ef\u80fd\u4f1a\u4fdd\u7559\u5bf9\u770b\u4f3c\u65e0\u6cd5\u8bbf\u95ee\u7684\u5185\u5bb9\u7684\u5f15\u7528\uff08\u4f8b\u5982\uff0c\u5728\u95ed\u5305\u6216\u5185\u8054\u7f13\u5b58\u4e2d\uff09\u3002<\/li>\n<li>\u4e0d\u540c\u7684JavaScript\u5f15\u64ce\u5904\u7406\u8fd9\u4e9b\u4e8b\u60c5\u7684\u65b9\u5f0f\u53ef\u80fd\u4e0d\u540c\uff0c\u6216\u8005\u540c\u4e00\u4e2a\u5f15\u64ce\u5728\u4e0d\u540c\u7248\u672c\u4e2d\u53ef\u80fd\u4f1a\u6539\u53d8\u5176\u7b97\u6cd5\u3002<\/li>\n<li>\u590d\u6742\u7684\u56e0\u7d20\u53ef\u80fd\u5bfc\u81f4\u5bf9\u8c61\u88ab\u610f\u5916\u5730\u4fdd\u7559\u5f88\u957f\u65f6\u95f4\uff0c\u4f8b\u5982\u4e0e\u67d0\u4e9b\u5e94\u7528\u7a0b\u5e8f\u7f16\u7a0b\u63a5\u53e3\uff08API\uff09\u4e00\u8d77\u4f7f\u7528\u65f6\u3002<\/li>\n<\/ul>\n<p>\u6240\u4ee5\uff0c\u5728\u7edd\u5927\u591a\u6570\u573a\u666f\u4e0b\uff0c\u4e3b\u52a8\u6e05\u7406\u5f15\u7528\uff08\u79fb\u9664\u76d1\u542c\u5668\u3001\u6e05\u7a7a\u53d8\u91cf\u3001useEffect return cleanup\uff09\u624d\u662f\u6b63\u9053\u3002<\/p>\n<p>WeakRef \u7684 <code>deref()<\/code> \u8fd4\u56de undefined \u7684\u65f6\u673a\u4f9d\u8d56 GC\uff0c\u4e0d\u53ef\u9884\u6d4b\uff0c\u6240\u4ee5\u4e0d\u5e94\u8be5\u7528\u5b83\u6765\u505a\u786e\u5b9a\u6027\u7684\u8d44\u6e90\u7ba1\u7406\u3002<\/p>\n<p>\u4f8b\u5982\u4e0a\u9762\u6848\u4f8b\u63d0\u5230\u7684\u4e8b\u4ef6\u7ba1\u7406\uff0c\u4e0b\u9762\u7684AbortController\u65b9\u6cd5\u662f\u66f4\u52a0\u63a8\u8350\u7684\uff1a<\/p>\n<pre>function setup() {\r\n  const el = document.getElementById('target');\r\n  const controller = new AbortController();\r\n  \r\n  window.addEventListener('resize', () =&gt; {\r\n    el.style.width = '100%';\r\n  }, { signal: controller.signal });\r\n  \r\n  \/\/ \u9700\u8981\u6e05\u7406\u65f6\r\n  controller.abort(); \/\/ \u81ea\u52a8\u79fb\u9664\u76d1\u542c\u5668\r\n}<\/pre>\n<p>\u6211\u4e2a\u4eba\u7684\u89c2\u70b9\u662f\u8fd9\u6837\u7684\uff1a\u4f60\u8be5\u600e\u4e48\u5f00\u53d1\u5c31\u600e\u4e48\u5f00\u53d1\uff0c\u4e0d\u7528\u7ba1\u4ec0\u4e48\u5185\u5b58\u6ca1\u6709\u56de\u6536\u8fd9\u4e9b\uff0c\u5927\u591a\u6570\u573a\u666f\u4e0b\uff0c\u4f60\u591a\u4f7f\u7528\u70b9\u5185\u5b58\uff0c\u5c11\u4e00\u70b9\u5185\u5b58\uff0c\u5bf9\u7528\u6237\u5f71\u54cd\u51e0\u4e4e\u6ca1\u6709\uff0c\u8ba9JS\u5f15\u64ce\u81ea\u5df1\u53bb\u7ef4\u62a4\u5427\uff0c\u9664\u975e\u9047\u5230\u5185\u5b58\u5360\u6709\u5f88\u5927\uff0c\u4e0d\u5f97\u4e0d\u53bb\u5904\u7406\u7684\u573a\u666f\uff0c\u8fd9\u4e2a\u65f6\u5019\uff0c\u5927\u5bb6\u518d\u53bb\u8003\u8651\u4f7f\u7528WeakRef\u505a\u5185\u5b58\u4f18\u5316\u3002<\/p>\n<h3>\u56db\u3001\u7ed3\u8bed\u788e\u788e\u5ff5<\/h3>\n<p>\u6211\u7684\u4e2a\u4eba\u535a\u5ba2\u5f00\u59cb\u51fa\u73b0\u5f88\u591aAI\u5473\u5341\u8db3\u7684\u8bc4\u8bba\uff0c\u5148\u662f\u4e00\u53e5\u8bdd\u603b\u7ed3\u6587\u7ae0\u5185\u5bb9\uff0c\u7136\u540e\u5bf9\u5185\u5bb9\u548c\u4f5c\u8005\u65e0\u8111\u5439\uff0c\u4ec0\u4e48\u201c\u786c\u6838\u201d\uff0c\u4ec0\u4e48\u201c\u9ad8\u5927\u4e0a\u201d\u3002<\/p>\n<p>\u8fd8\u4e0d\u5982\u4ee5\u524d\u56de\u590d\u7684\u201c\u5199\u7684\u72d7\u5c41\u4e0d\u901a\u201d\u8fd9\u6837\u7684\u8bc4\u8bba\u3002[\u53f9\u6c14]<\/p>\n<p>\u6700\u8fd1\u5237\u6f2b\u5267\uff0c\u53d1\u73b0\u4e0b\u9762\u4e5f\u6709\u5f88\u591a\u8fd9\u6837\u7684\u8bc4\u8bba\uff0c\u90fd\u662fAI\u673a\u5668\u4eba\u3002<\/p>\n<p>\u5176\u5b9e\u9f99\u867e\u706b\u4e86\u4e4b\u540e\uff0c\u8fd9\u6837\u7684\u4e1c\u897f\u4f1a\u8d8a\u6765\u8d8a\u666e\u904d\u3002<\/p>\n<p>\u6bd4\u65b9\u8bf4\u5373\u6709\u540c\u4e8b\u5f04\u4e86\u81ea\u52a8\u53bb\u793e\u4ea4\u7f51\u7ad9\u8bc4\u8bba\u7684\u9f99\u867e\u3002<\/p>\n<p>\u4e0d\u8fc7\u6211\u76ee\u524d\u8fd8\u672a\u6df1\u5165\u8fd9\u7c7bAI\u5de5\u5177\uff0c\u4e0d\u6025\u4e0d\u6025\uff0c\u5bf9\u6211\u800c\u8a00\uff0c\u638c\u63e1\u66f4\u57fa\u7840\u7684\u77e5\u8bc6\u4e0e\u6280\u80fd\uff0c\u6bd4\u8ffd\u9010\u6d41\u884c\u5de5\u5177\u66f4\u6709\u4ef7\u503c\u3002<\/p>\n<p>\u597d\u4e86\uff0c\u5c31\u8bf4\u8fd9\u4e48\u591a\u5427\uff0c\u611f\u8c22\u5927\u5bb6\u7684\u9605\u8bfb\uff0c\u6211\u4eec\u4e0b\u5468\u518d\u89c1\uff01<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202604\/2026-4-13_154340.webp\" width=\"176\" height=\"130\" alt=\"\u98de\u543b\u518d\u89c1\" class=\"alignnone size-medium\" \/><\/p>\n<p>\ud83d\ude09\ud83d\ude0a\ud83d\ude07<br \/>\n\ud83e\udd70\ud83d\ude0d\ud83d\ude18<\/p>\n<p>\u672c\u6587\u4e3a\u539f\u521b\u6587\u7ae0\uff0c\u4f1a\u7ecf\u5e38\u66f4\u65b0\u77e5\u8bc6\u70b9\u4ee5\u53ca\u4fee\u6b63\u4e00\u4e9b\u9519\u8bef\uff0c\u56e0\u6b64\u8f6c\u8f7d\u8bf7\u4fdd\u7559\u539f\u51fa\u5904\uff0c\u65b9\u4fbf\u6eaf\u6e90\uff0c\u907f\u514d\u9648\u65e7\u9519\u8bef\u77e5\u8bc6\u7684\u8bef\u5bfc\uff0c\u540c\u65f6\u6709\u66f4\u597d\u7684\u9605\u8bfb\u4f53\u9a8c\u3002<br \/>\n\u672c\u6587\u5730\u5740\uff1a<a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/?p=12155\">https:\/\/www.zhangxinxu.com\/wordpress\/?p=12155<\/a><\/p>\n<p>\uff08\u672c\u7bc7\u5b8c\uff09<\/p>\n","protected":false},"excerpt":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202604\/2026-4-13_155748.webp\" width=\"160\" height=\"102\" alt=\"WeakRef\u5c01\u9762\u56fe\" class=\"alignright size-medium\" loading=\"lazy\" \/><\/p>\n<p>\u5148\u524d\u6709WeakMap\u548cWeakSet\uff0c\u73b0\u5728\u53c8\u51fa\u4e86JS WeakRef\u5f31\u5f15\u7528\uff0c\u53ef\u4ee5\u4f18\u5316\u5185\u5b58\u5f00\u9500\uff0c\u770b\u6848\u4f8b\u5f88\u6709\u4ef7\u503c\uff0c\u4e0d\u8fc7\u65e0\u8bba\u662f\u5b98\u65b9\u8fd8\u662f\u6211\u4e2a\u4eba\u90fd\u5efa\u8bae\u5927\u5bb6\u8c28\u614e\u4f7f\u7528\uff0c\u8fd9\u53c8\u662f\u4e3a\u4f55\u5462\uff1f<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1284],"tags":[1891,705,874,1237,1775,2111,2112,358,566],"_links":{"self":[{"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/posts\/12155"}],"collection":[{"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/comments?post=12155"}],"version-history":[{"count":5,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/posts\/12155\/revisions"}],"predecessor-version":[{"id":12186,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/posts\/12155\/revisions\/12186"}],"wp:attachment":[{"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/media?parent=12155"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/categories?post=12155"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/tags?post=12155"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}