{"id":156,"date":"2024-12-10T23:53:23","date_gmt":"2024-12-10T15:53:23","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=156"},"modified":"2024-12-10T23:53:23","modified_gmt":"2024-12-10T15:53:23","slug":"%e5%a6%82%e4%bd%95%e5%9c%a8-javascript-%e4%b8%ad%e6%9c%89%e6%95%88%e5%9c%b0%e5%ba%8f%e5%88%97%e5%8c%96%e5%90%ab%e6%9c%89%e5%be%aa%e7%8e%af%e5%bc%95%e7%94%a8%e7%9a%84-json-%e6%95%b0%e6%8d%ae%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2024\/12\/10\/%e5%a6%82%e4%bd%95%e5%9c%a8-javascript-%e4%b8%ad%e6%9c%89%e6%95%88%e5%9c%b0%e5%ba%8f%e5%88%97%e5%8c%96%e5%90%ab%e6%9c%89%e5%be%aa%e7%8e%af%e5%bc%95%e7%94%a8%e7%9a%84-json-%e6%95%b0%e6%8d%ae%ef%bc%9f\/","title":{"rendered":"\u5982\u4f55\u5728 JavaScript \u4e2d\u6709\u6548\u5730\u5e8f\u5217\u5316\u542b\u6709\u5faa\u73af\u5f15\u7528\u7684 JSON \u6570\u636e\uff1f"},"content":{"rendered":"\n

\u65e5\u5e38\u5728 JavaScript \u4e2d\uff0c\u5c1d\u8bd5\u5bf9\u542b\u6709\u5faa\u73af\u5f15\u7528<\/strong>\u7684\u5bf9\u8c61\u8fdb\u884c JSON \u5e8f\u5217\u5316\u65f6\uff0cJSON.stringify<\/code> \u4f1a\u629b\u51fa\u9519\u8bef\uff1a<\/p>\n\n\n\n

const obj = {};\nobj.self = obj; \/\/ \u5faa\u73af\u5f15\u7528\n\nJSON.stringify(obj); \/\/ \u629b\u51fa TypeError: Converting circular structure to JSON<\/code><\/pre>\n\n\n\n
\u90a3\u4e48\u5982\u4f55\u5904\u7406 JSON \u4e2d\u7684\u5faa\u73af\u7ed3\u6784\uff1f\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u53ef\u4ee5\u91c7\u7528\u4ee5\u4e0b\u65b9\u6cd5\uff1a<\/p>\n\n\n\n
\n\n\n\n
1. \u4f7f\u7528 JSON.stringify<\/code> \u7684 replacer<\/code> \u53c2\u6570<\/strong><\/h3>\n\n\n\n
    \n
  • \u81ea\u5b9a\u4e49\u4e00\u4e2a replacer<\/code> \u51fd\u6570\uff0c\u5728\u5e8f\u5217\u5316\u65f6\u68c0\u6d4b\u5230\u5faa\u73af\u5f15\u7528\u540e\u8fdb\u884c\u5904\u7406\u3002<\/li>\n\n\n\n
  • \u5229\u7528\u4e00\u4e2a\u96c6\u5408\uff08\u5982 Set<\/code>\uff09\u8bb0\u5f55\u5df2\u7ecf\u8bbf\u95ee\u8fc7\u7684\u5bf9\u8c61\u3002 \u793a\u4f8b<\/strong>\uff1a<\/li>\n<\/ul>\n\n\n\n
       const obj = { name: \"Alice\" };\n   obj.self = obj; \/\/ \u5faa\u73af\u5f15\u7528\n\n   function safeStringify(obj) {\n       const seen = new Set();\n       return JSON.stringify(obj, (key, value) => {\n           if (typeof value === \"object\" && value !== null) {\n               if (seen.has(value)) {\n                   return \"[Circular]\"; \/\/ \u7528\u7279\u6b8a\u6807\u8bb0\u5904\u7406\u5faa\u73af\u5f15\u7528\n               }\n               seen.add(value);\n           }\n           return value;\n       });\n   }\n\n   console.log(safeStringify(obj));\n   \/\/ \u8f93\u51fa: {\"name\":\"Alice\",\"self\":\"[Circular]\"}<\/code><\/pre>\n\n\n\n
    \n\n\n\n
    2. \u4f7f\u7528\u7b2c\u4e09\u65b9\u5e93<\/strong><\/h3>\n\n\n\n
      \n
    • \u4f7f\u7528\u4e13\u95e8\u5904\u7406\u5faa\u73af\u5f15\u7528\u7684\u5e93\uff0c\u4f8b\u5982 circular-json \u6216 flatted\u3002<\/li>\n\n\n\n
    • \u8fd9\u4e9b\u5e93\u63d0\u4f9b\u4e86\u652f\u6301\u5faa\u73af\u5f15\u7528\u7684\u5e8f\u5217\u5316\u4e0e\u53cd\u5e8f\u5217\u5316\u529f\u80fd\u3002 \u5b89\u88c5\u5e93<\/strong>\uff08\u4ee5 flatted<\/code> \u4e3a\u4f8b\uff09\uff1a<\/li>\n<\/ul>\n\n\n\n
         npm install flatted<\/code><\/pre>\n\n\n\n
      \u4f7f\u7528\u793a\u4f8b<\/strong>\uff1a<\/p>\n\n\n\n
         const { stringify, parse } = require(\"flatted\");\n\n   const obj = { name: \"Alice\" };\n   obj.self = obj;\n\n   const serialized = stringify(obj);\n   console.log(serialized); \/\/ \u8f93\u51fa: {\"name\":\"Alice\",\"self\":\"~\"}\n\n   const deserialized = parse(serialized);\n   console.log(deserialized);\n   \/\/ \u8f93\u51fa: { name: 'Alice', self: [Circular] }<\/code><\/pre>\n\n\n\n
      \n\n\n\n
      3. \u6df1\u62f7\u8d1d\u5bf9\u8c61\uff0c\u79fb\u9664\u5faa\u73af\u5f15\u7528<\/strong><\/h3>\n\n\n\n
        \n
      • \u624b\u52a8\u904d\u5386\u5bf9\u8c61\uff0c\u79fb\u9664\u5faa\u73af\u5f15\u7528\u6216\u5c06\u5176\u66ff\u6362\u4e3a\u5176\u4ed6\u503c\uff08\u5982 null<\/code>\uff09\u3002<\/li>\n\n\n\n
      • \u9002\u5408\u5e8f\u5217\u5316\u524d\u9884\u5904\u7406\u5bf9\u8c61\u3002 \u793a\u4f8b<\/strong>\uff1a<\/li>\n<\/ul>\n\n\n\n
           function removeCircular(obj, seen = new Set()) {\n       if (typeof obj !== \"object\" || obj === null) return obj;\n\n       if (seen.has(obj)) return null; \/\/ \u68c0\u6d4b\u5230\u5faa\u73af\u5f15\u7528\uff0c\u8fd4\u56de null\n       seen.add(obj);\n\n       const result = Array.isArray(obj) ? [] : {};\n       for (const key in obj) {\n           result[key] = removeCircular(obj[key], seen);\n       }\n       return result;\n   }\n\n   const obj = { name: \"Alice\" };\n   obj.self = obj;\n\n   const cleanObj = removeCircular(obj);\n   console.log(JSON.stringify(cleanObj)); \/\/ \u8f93\u51fa: {\"name\":\"Alice\",\"self\":null}<\/code><\/pre>\n\n\n\n
        \n\n\n\n
        4. \u4f7f\u7528 WeakSet<\/code> \u52a8\u6001\u68c0\u6d4b\u5faa\u73af\u5f15\u7528<\/strong><\/h3>\n\n\n\n
          \n
        • WeakSet<\/code> \u53ea\u5b58\u50a8\u5bf9\u8c61\u7684\u5f31\u5f15\u7528\uff0c\u4e0d\u5f71\u54cd\u5783\u573e\u56de\u6536\u3002<\/li>\n\n\n\n
        • \u907f\u514d\u5360\u7528\u989d\u5916\u7684\u5185\u5b58\u3002 \u793a\u4f8b<\/strong>\uff1a<\/li>\n<\/ul>\n\n\n\n
             function safeStringify(obj) {\n       const seen = new WeakSet();\n       return JSON.stringify(obj, (key, value) => {\n           if (typeof value === \"object\" && value !== null) {\n               if (seen.has(value)) {\n                   return \"[Circular]\";\n               }\n               seen.add(value);\n           }\n           return value;\n       });\n   }\n\n   const obj = { name: \"Alice\" };\n   obj.self = obj;\n\n   console.log(safeStringify(obj));\n   \/\/ \u8f93\u51fa: {\"name\":\"Alice\",\"self\":\"[Circular]\"}<\/code><\/pre>\n\n\n\n
          \n\n\n\n
          \u603b\u7ed3<\/h3>\n\n\n\n
            \n
          • \u7b80\u5355\u5904\u7406<\/strong>\uff1a\u81ea\u5b9a\u4e49 replacer<\/code> \u6216\u624b\u52a8\u6df1\u62f7\u8d1d\u3002<\/li>\n\n\n\n
          • \u63a8\u8350\u65b9\u6cd5<\/strong>\uff1a\u4f7f\u7528 WeakSet<\/code> \u7b80\u5316\u5faa\u73af\u5f15\u7528\u68c0\u6d4b\u3002<\/li>\n\n\n\n
          • \u590d\u6742\u573a\u666f<\/strong>\uff1a\u5f15\u5165\u7b2c\u4e09\u65b9\u5e93\uff08\u5982 flatted<\/code>\uff09\u53ef\u9760\u89e3\u51b3\u3002<\/li>\n<\/ul>\n\n\n\n
            \u6839\u636e\u5b9e\u9645\u9700\u6c42\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\u5373\u53ef\u9ad8\u6548\u5904\u7406\u5faa\u73af\u7ed3\u6784\u7684\u5e8f\u5217\u5316\u95ee\u9898\u3002<\/p>\n\n\n\n
            \u4ee5\u4e0a\u4e3a\u5728 JavaScript \u4e2d\u5e8f\u5217\u5316 JSON \u65f6\u5982\u4f55\u6709\u6548\u5904\u7406\u5faa\u73af\u7ed3\u6784\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u4fe1\u606f\u8bf7\u5173\u6ce8\u5176\u4ed6\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
            \u65e5\u5e38\u5728 JavaScript \u4e2d\uff0c\u5c1d\u8bd5\u5bf9\u542b\u6709\u5faa\u73af\u5f15\u7528\u7684\u5bf9\u8c61\u8fdb\u884c JSON \u5e8f\u5217\u5316\u65f6\uff0cJSON.stringif […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[46],"tags":[],"class_list":["post-156","post","type-post","status-publish","format-standard","hentry","category-javascript"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/156","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=156"}],"version-history":[{"count":2,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/156\/revisions"}],"predecessor-version":[{"id":158,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/156\/revisions\/158"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=156"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=156"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=156"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}