{"id":2250,"date":"2024-11-10T11:49:13","date_gmt":"2024-11-10T03:49:13","guid":{"rendered":"https:\/\/fwq.ai\/blog\/2250\/"},"modified":"2024-11-10T11:49:13","modified_gmt":"2024-11-10T03:49:13","slug":"%e4%bd%bf%e7%94%a8-javascript-%e4%bb%8e%e5%a4%b4%e5%bc%80%e5%a7%8b%e6%9e%84%e5%bb%ba%e5%8f%8d%e5%ba%94%e5%bc%8f%e5%95%86%e5%ba%97","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/2250\/","title":{"rendered":"\u4f7f\u7528 Javascript \u4ece\u5934\u5f00\u59cb\u200b\u200b\u6784\u5efa\u53cd\u5e94\u5f0f\u5546\u5e97"},"content":{"rendered":"<p>\u54cd\u5e94\u5f0f\u7f16\u7a0b\u662f\u4e00\u79cd\u5de7\u5999\u7684\u65b9\u6cd5\uff0c\u5141\u8bb8\u60a8\u521b\u5efa\u52a8\u6001\u53cd\u6620\u6570\u636e\u66f4\u6539\u7684\u5e94\u7528\u7a0b\u5e8f\u3002\u5b83\u662f react \u548c  \u7b49\u8bb8\u591a\u73b0\u4ee3 javascript \u6846\u67b6\u80cc\u540e\u7684\u6838\u5fc3\u6280\u672f &#8211; 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<strong>\u6548\u679c<\/strong>\uff1a\u81ea\u52a8\u8fd0\u884c\u4ee5\u54cd\u5e94\u53cd\u5e94\u6570\u636e\u53d8\u5316\u7684\u51fd\u6570\u3002\u5b83\u4eec\u662f\u4f7f\u7528\u6548\u679c\u51fd\u6570\u6ce8\u518c\u7684\uff0c\u8be5\u51fd\u6570\u8ddf\u8e2a\u5bf9\u4efb\u4f55\u8bbf\u95ee\u4fe1\u53f7\u7684\u4f9d\u8d56\u5173\u7cfb\u3002<\/li>\n<li> <strong>\u4fe1\u53f7<\/strong>\uff1a\u53cd\u5e94\u6027\u6570\u636e\u5c5e\u6027\uff0c\u6bcf\u5f53\u5176\u503c\u53d1\u751f\u53d8\u5316\u65f6\u901a\u77e5\u4f9d\u8d56\u6548\u5e94\u3002<\/li>\n<li> <strong>\u4f9d\u8d56\u6027<\/strong>\uff1a\u4fe1\u53f7\u548c\u4f9d\u8d56\u4e8e\u5b83\u4eec\u7684\u6548\u679c\u4e4b\u95f4\u7684\u5173\u7cfb\u3002\u8ddf\u8e2a\u4f9d\u8d56\u5173\u7cfb\uff0c\u4ee5\u4fbf\u4fe1\u53f7\u7684\u53d8\u5316\u89e6\u53d1\u76f8\u5173\u6548\u679c\u7684\u66f4\u65b0\u3002<\/li>\n<\/ul>\n<p>\u73b0\u5728\u6211\u4eec\u5df2\u7ecf\u4e86\u89e3\u4e86\u54cd\u5e94\u5f0f\u7f16\u7a0b\u5b9a\u4e49\uff0c\u8ba9\u6211\u4eec\u4e5f\u63d0\u4e00\u4e0b\u6211\u4eec\u5c06\u8981\u4f7f\u7528\u7684 javascript api\uff1a<\/p>\n<p><strong>proxy<\/strong>\uff1aproxy \u5bf9\u8c61\u5141\u8bb8\u60a8\u4e3a\u53e6\u4e00\u4e2a\u5bf9\u8c61\u521b\u5efa\u4ee3\u7406\uff0c\u4f7f\u60a8\u80fd\u591f\u4e3a\u57fa\u672c\u64cd\u4f5c\uff08\u5982\u5c5e\u6027\u8bbf\u95ee\u548c\u5206\u914d\uff09\u5b9a\u4e49\u81ea\u5b9a\u4e49\u884c\u4e3a\u3002\u5728\u6b64\u4ee3\u7801\u4e2d\uff0c\u5b83\u7528\u4e8e\u4f7f\u53cd\u5e94\u5f0f\u5b58\u50a8\uff08\u72b6\u6001\u5bf9\u8c61\uff09\u54cd\u5e94\u66f4\u6539\u3002<\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<p><strong>reflect<\/strong>\uff1areflect api \u63d0\u4f9b\u53ef\u62e6\u622a javascript \u64cd\u4f5c\u7684\u65b9\u6cd5\u3002\u5b83\u7528\u4e8e\u5728\u54cd\u5e94\u5f0f\u51fd\u6570\u4e2d\u6267\u884c\u8bf8\u5982 reflect.get \u548c reflect.set \u4e4b\u7c7b\u7684\u64cd\u4f5c\uff0c\u4ece\u800c\u5141\u8bb8\u4ee3\u7406\u5904\u7406\u5c5e\u6027\u8bbf\u95ee\u548c\u8d4b\u503c\uff0c\u540c\u65f6\u4fdd\u6301\u5bf9\u8c61\u7684\u539f\u59cb\u884c\u4e3a\u3002<\/p>\n<p><strong>map<\/strong>\uff1amap \u5bf9\u8c61\u662f\u4e00\u4e2a\u4fdd\u5b58\u7684\u96c6\u5408\uff0c\u5176\u4e2d\u952e\u53ef\u4ee5\u662f\u4efb\u4f55\u6570\u636e\u7c7b\u578b\u3002\u5728\u6b64\u5b9e\u73b0\u4e2d\u4f7f\u7528\u5b83\u6765\u521b\u5efa dependencymap\uff0c\u8be5\u4f9d\u8d56\u5173\u7cfb\u8ddf\u8e2a\u4e0e\u6bcf\u4e2a\u4fe1\u53f7\u5173\u8054\u7684\u4f9d\u8d56\u5173\u7cfb\u3002<\/p>\n<p>\u73b0\u5728\uff0c\u8ba9\u6211\u4eec\u5f00\u59cb\u5b9a\u4e49\u6211\u4eec\u7684\u521d\u59cb\u72b6\u6001\uff1a<\/p>\n<pre>\n\/\/ let's define a map object to track our dependencies\nconst dependencytrackermap = new map();\n\/\/ the activeeffect variable will hold the currently executing \n\/\/ effect function. \n\/\/ it will be set when an effect is run and will be used\n\/\/ to track which effects depend on specific reactive properties. \nlet activeeffect = null\n\n\/\/ this function will make an object reactive\nfunction reactive(target) {\n    return new proxy(target, {\n        get(obj, prop) {\n            trackdependency(prop); \/\/ track dependency\n            return reflect.get(obj, prop);\n        },\n        set(obj, prop, value) {\n            const result = reflect.set(obj, prop, value);\n            triggerdependency(prop); \/\/ trigger reactions\n            return result;\n        }\n    });\n}\n\n\/\/ the effect function will register reactive functions\nfunction effect(fn) {\n    activeeffect = fn;\n    fn(); \/\/ run the function once to register dependencies\n    activeeffect = null;\n}\n\n\/\/ this function will track dependencies\nfunction trackdependency(key) {\n    if (activeeffect) {\n        if (!dependencytrackermap.has(key)) {\n            dependencytrackermap.set(key, new set());\n        }\n        dependencytrackermap.get(key).add(activeeffect);\n    }\n}\n\n\/\/ this function will trigger dependencies\nfunction triggerdependency(key) {\n    const deps = dependencytrackermap.get(key);\n    if (deps) {\n        deps.foreach(effect =&gt; effect());\n    }\n}\n\n\/\/ this will create a reactive object with an initial state\n\/\/ count and message here are signals\nconst state = reactive({ count: 0, message: \"hello\" });\n<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u6240\u4ee5\uff0c\u8fd9\u5c31\u662f\u6211\u4eec\u6240\u505a\u7684\uff1a<\/p>\n<ol>\n<li>\u6211\u4eec\u521b\u5efa\u4e86\u4e00\u4e2a\u54cd\u5e94\u5f0f\u51fd\u6570\uff0c\u5b83\u63a5\u53d7\u4e00\u4e2a\u5bf9\u8c61\u5e76\u8fd4\u56de\u4e00\u4e2a\u4ee3\u7406\uff0c\u8be5\u4ee3\u7406\u5c06\u8ddf\u8e2a\u5c06\u6765\u5bf9\u8be5\u5bf9\u8c61\u8fdb\u884c\u7684\u66f4\u6539<\/li>\n<li>\u6211\u4eec\u521b\u5efa\u4e86\u4e00\u4e2a\u6548\u679c\u51fd\u6570\uff0c\u5b83\u6ce8\u518c\u4f9d\u8d56\u4e8e\u72b6\u6001\u7684\u53cd\u5e94\u51fd\u6570\u3002\u5b9a\u4e49\u6548\u679c\u540e\uff0c\u5b83\u4f1a\u7acb\u5373\u8fd0\u884c\u4ee5\u6ce8\u518c\u4efb\u4f55\u4f9d\u8d56\u9879\u5e76\u76f8\u5e94\u5730\u8bbe\u7f6e activeeffect\u3002<\/li>\n<li>\u6211\u4eec\u521b\u5efa\u4e86\u4e00\u4e2a\u4f9d\u8d56\u8ddf\u8e2a\u5668\uff0c\u5b83\u7531\u4e09\u90e8\u5206\u7ec4\u6210\uff1atrackdependency \u51fd\u6570\u68c0\u67e5\u5f53\u8bbf\u95ee\u54cd\u5e94\u5f0f\u5c5e\u6027\u65f6\u662f\u5426\u6709\u4e3b\u52a8\u6548\u679c\u3002\u5982\u679c\u662f\uff0c\u5b83\u4f1a\u5c06\u8be5\u6548\u679c\u6dfb\u52a0\u5230 dependencytrackermap \u4e2d\u76f8\u5e94\u5c5e\u6027\u7684\u4e00\u7ec4\u4f9d\u8d56\u9879\u4e2d\u3002\u53cd\u8fc7\u6765\uff0ctriggerdependency \u51fd\u6570\u4ece dependencytrackermap \u4e2d\u68c0\u7d22\u4e0e\u5c5e\u6027\u5173\u8054\u7684\u4f9d\u8d56\u6548\u679c\u96c6\uff0c\u5e76\u5728\u5c5e\u6027\u503c\u66f4\u6539\u65f6\u6267\u884c\u6bcf\u4e2a\u6548\u679c\u3002<\/li>\n<\/ol>\n<p>\u73b0\u5728\uff0c\u8ba9\u6211\u4eec\u521b\u5efa\u4e00\u4e2a\u5e26\u6709\u56de\u8c03\u7684\u6548\u679c\u5e76\u5c1d\u8bd5\u89e6\u53d1\u5b83\uff1a<\/p>\n<pre>\/\/we are using state from the previous snippet:\neffect(() =&gt; {\n    console.log(count has changed: ${state.count});\n});\n\neffect(() =&gt; {\n    console.log(\"message has changed\");\n    console.log(the new message is: ${state.message});\n});\n<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u5f53\u6211\u4eec\u5c1d\u8bd5\u66f4\u65b0\u6211\u4eec\u521b\u5efa\u7684\u72b6\u6001\u65f6\uff0c\u63a7\u5236\u53f0\u65e5\u5fd7\u5c06\u89e6\u53d1\uff1a<\/p>\n<pre>\/\/ Modifying state (or updating a signal) triggers the dependent effects:\n\nstate.count++; \n\/\/ \"Count has changed: 1\"\nstate.message = \"Hello!!!\"; \n\/\/ \"Message has changed\"\n\/\/ \"The new message is: Hello!!!\"\n<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u4ee5\u4e0b\u662f\u89e6\u53d1\u4f9d\u8d56\u9879\u65f6\u53d1\u751f\u7684\u60c5\u51b5\u7684\u4e00\u4e9b\u53ef\u89c6\u5316\uff1a<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/001\/246\/273\/173069930590170.jpg\" class=\"aligncenter\" title=\"\u4f7f\u7528 Javascript \u4ece\u5934\u5f00\u59cb\u200b\u200b\u6784\u5efa\u53cd\u5e94\u5f0f\u5546\u5e97\u63d2\u56fe\" alt=\"\u4f7f\u7528 Javascript \u4ece\u5934\u5f00\u59cb\u200b\u200b\u6784\u5efa\u53cd\u5e94\u5f0f\u5546\u5e97\u63d2\u56fe\" \/><\/p>\n<hr>\n<p>\u5728\u672c\u6587\u4e2d\uff0c\u6211\u4eec\u63a2\u8ba8\u4e86\u5982\u4f55\u5728 javascript \u4e2d\u521b\u5efa\u57fa\u672c\u7684\u53cd\u5e94\u5f0f\u7cfb\u7edf\uff0c\u4ece\u800c\u5b9e\u73b0\u81ea\u52a8\u66f4\u65b0\uff08\u6216\u526f\u4f5c\u7528\uff09\u4ee5\u54cd\u5e94\u6570\u636e\u7684\u53d8\u5316\u3002\u6b64\u5b9e\u73b0\u4f5c\u4e3a\u53cd\u5e94\u5f0f\u7f16\u7a0b\u6982\u5ff5\u7684\u4ecb\u7ecd\uff0c\u5b83\u662f\u6846\u67b6\u201c\u9b54\u6cd5\u201d\u7684\u4e00\u90e8\u5206\u3002\u6b64\u5916\uff0c\u6211\u4eec\u8fd8\u4e86\u89e3\u4e86 proxy \u548c reflect api \u7684\u4f5c\u7528\u5e76\u4f7f\u7528\u4e86\u5b83\u4eec\uff0c\u4ee5\u53ca map \u5bf9\u8c61\u3002 <\/p>\n<p>\u603b\u4e4b\uff0c\u8fd9\u4e2a\u53cd\u5e94\u5f0f\u7cfb\u7edf\u7ba1\u7406\u4f9d\u8d56\u5173\u7cfb\u5e76\u5728\u72b6\u6001\u53d8\u5316\u65f6\u81ea\u52a8\u66f4\u65b0\u6548\u679c\u3002\u901a\u8fc7\u6ce8\u518c\u4f9d\u8d56\u4e8e\u7279\u5b9a\u53cd\u5e94\u5c5e\u6027\u7684\u51fd\u6570\uff0c\u7cfb\u7edf\u53ef\u4ee5\u8ddf\u8e2a\u54ea\u4e9b\u51fd\u6570\u4f9d\u8d56\u4e8e\u54ea\u4e9b\u5c5e\u6027\uff0c\u5e76\u5728\u9700\u8981\u65f6\u91cd\u65b0\u8fd0\u884c\u5b83\u4eec\u3002\u8fd9\u79cd\u65b9\u6cd5\u5141\u8bb8\u521b\u5efa\u54cd\u5e94\u5f0f\u5e94\u7528\u7a0b\u5e8f\uff0c\u5176\u4e2d\u72b6\u6001\u66f4\u6539\u4f1a\u81ea\u52a8\u53cd\u6620\u5728 ui \u4e2d\uff0c\u65e0\u9700\u989d\u5916\u4ee3\u7801\uff0c\u4ece\u800c\u6539\u5584\u5f00\u53d1\u4eba\u5458\u4f53\u9a8c\u5e76\u4f7f\u6570\u636e\u5904\u7406\u66f4\u8f7b\u677e\u3001\u66f4\u9ad8\u6548\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u4f7f\u7528 Javascript 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