{"id":164432,"date":"2024-05-08T14:54:23","date_gmt":"2024-05-08T06:54:23","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/164432.html"},"modified":"2024-05-08T14:54:29","modified_gmt":"2024-05-08T06:54:29","slug":"vue3-%e9%a1%b9%e7%9b%ae%e5%bc%80%e5%8f%91%e4%b8%ad%ef%bc%8cv-for-%e4%b8%ba%e4%bd%95%e9%9c%80%e8%a6%81%e4%bd%bf%e7%94%a8-key-%e5%80%bc","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/164432.html","title":{"rendered":"vue3 \u9879\u76ee\u5f00\u53d1\u4e2d\uff0cv-for \u4e3a\u4f55\u9700\u8981\u4f7f\u7528 key \u503c"},"content":{"rendered":"

\"vue3<\/p>\n

\u5728Vue3\u9879\u76ee\u5f00\u53d1\u4e2d\uff0c\u5f53\u6211\u4eec\u4f7f\u7528v-for\u6307\u4ee4\u8fdb\u884c\u5217\u8868\u6e32\u67d3\u65f6\uff0c\u9700\u8981\u4f7f\u7528key\u503c\u7684\u539f\u56e0\u6709\uff1a\u6027\u80fd\u4f18\u5316\u3001DOM\u5143\u7d20\u7684\u7a33\u5b9a\u6027<\/strong>\u3001\u4ee5\u53ca\u8ddf\u8e2a\u8282\u70b9\u7684\u8eab\u4efd<\/strong>\u3002\u4f7f\u7528key\u53ef\u4ee5\u5e2e\u52a9Vue\u66f4\u5feb\u5730\u786e\u5b9a\u8282\u70b9\u7684\u521b\u5efa\u3001\u66f4\u65b0\u6216\u662f\u79fb\u9664\u64cd\u4f5c<\/strong>\uff0c\u51cf\u5c11\u4e0d\u5fc5\u8981\u7684DOM\u64cd\u4f5c\uff0c\u4ece\u800c\u63d0\u5347\u5e94\u7528\u6027\u80fd\u3002\u5c24\u5176\u662f\u5728\u5927\u91cf\u6570\u636e\u6216\u590d\u6742\u4ea4\u4e92\u573a\u666f\u4e2d\uff0c\u6b63\u786e\u5730\u4f7f\u7528key\u53ef\u4ee5\u663e\u8457\u63d0\u9ad8\u6e32\u67d3\u6027\u80fd\u3002<\/p>\n<\/p>\n

\u9996\u5148\uff0cVue\u91c7\u7528\u865a\u62dfDOM\u6765\u6e32\u67d3\u548c\u66f4\u65b0\u771f\u5b9eDOM\uff0c\u5f53\u6570\u636e\u53d1\u751f\u53d8\u5316\u65f6\uff0cVue\u4f1a\u901a\u8fc7\u6bd4\u5bf9\u65b0\u65e7\u865a\u62dfDOM\u7684\u5dee\u5f02\u6765\u51b3\u5b9a\u5982\u4f55\u6709\u6548\u5730\u66f4\u65b0\u771f\u5b9eDOM\u3002\u5982\u679c\u4e0d\u4f7f\u7528key\uff0cVue\u5728\u66f4\u65b0DOM\u65f6\u4ec5\u80fd\u505a\u5230\u201c\u5c31\u5730\u66f4\u65b0\u201d\uff0c\u5373\u539f\u5730\u66ff\u6362\u6570\u636e\uff0c\u8fd9\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u4f1a\u5bfc\u81f4\u4e0d\u5fc5\u8981\u7684DOM\u64cd\u4f5c\u3002\u800c\u52a0\u4e0akey\u4e4b\u540e\uff0cVue\u80fd\u591f\u66f4\u51c6\u786e\u5730\u8bc6\u522b\u54ea\u4e9b\u5143\u7d20\u662f\u65b0\u589e\u7684\u3001\u54ea\u4e9b\u9700\u8981\u88ab\u66f4\u65b0\uff0c\u4ee5\u53ca\u54ea\u4e9b\u9700\u8981\u88ab\u79fb\u9664\uff0c\u4ece\u800c\u53ea\u5bf9\u9700\u8981\u53d8\u52a8\u7684DOM\u5143\u7d20\u8fdb\u884c\u64cd\u4f5c\uff0c\u51cf\u5c11\u4e86\u91cd\u6392\u4e0e\u91cd\u7ed8\uff0c\u63d0\u9ad8\u4e86\u6027\u80fd\u3002<\/p>\n<\/p>\n

I. KEY\u7684\u4f5c\u7528\u539f\u7406<\/strong><\/p>\n<\/p>\n

\u4e8c\u3001\u6027\u80fd\u4f18\u5316<\/strong><\/p>\n<\/p>\n

Vue\u5728\u5904\u7406v-for\u751f\u6210\u7684\u5217\u8868\u65f6\uff0ckey\u662f\u9ad8\u6548\u66f4\u65b0\u865a\u62dfDOM\u7684\u4e00\u79cd\u7b97\u6cd5\u4f9d\u636e\u3002Vue\u7684Diff\u7b97\u6cd5\u5728\u66f4\u65b0\u65f6\uff0c\u4f1a\u901a\u8fc7key\u6765\u5224\u65ad\u67d0\u4e2a\u8282\u70b9\u662f\u5426\u53ef\u4ee5\u590d\u7528\u3002\u6ca1\u6709key\u65f6\uff0cVue\u4f1a\u91c7\u7528\u4e00\u79cd\u7b80\u6613\u6a21\u5f0f\u6765\u8fdb\u884c\u5bf9\u6bd4\uff0c\u8fd9\u4f1a\u5bfc\u81f4\u5373\u4f7f\u5185\u5bb9\u6ca1\u6709\u53d8\u52a8\u7684DOM\u5143\u7d20\u4e5f\u4f1a\u968f\u7740\u4f4d\u7f6e\u7684\u6539\u53d8\u800c\u88ab\u9500\u6bc1\u91cd\u5efa\uff0c\u8fd9\u65e0\u7591\u589e\u52a0\u4e86\u66f4\u65b0\u65f6\u7684\u5f00\u9500\u3002\u6709\u4e86key\uff0cVue\u53ef\u4ee5\u66f4\u51c6\u786e\u3001\u66f4\u5feb\u901f\u5730\u8bc6\u522b\u548c\u5904\u7406\u8282\u70b9\u3002<\/p>\n<\/p>\n

\u4e09\u3001DOM\u5143\u7d20\u7684\u7a33\u5b9a\u6027<\/strong><\/p>\n<\/p>\n

\u5728\u6267\u884c\u5217\u8868\u6570\u636e\u66f4\u65b0\u65f6\uff08\u5982\u6392\u5e8f\u7b49\uff09\uff0c\u6709\u7684DOM\u5143\u7d20\u53ef\u80fd\u4e0d\u9700\u8981\u4efb\u4f55\u53d8\u5316\u3002\u4f46\u662f\uff0c\u5982\u679c\u6ca1\u6709key\u6216\u8005key\u8bbe\u7f6e\u4e0d\u5408\u7406\uff0c\u8fd9\u65f6Vue\u65e0\u6cd5\u77e5\u6653\u524d\u540e\u4e24\u4e2a\u865a\u62dfDOM\u4e2d\u8282\u70b9\u7684\u5bf9\u5e94\u5173\u7cfb\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u539f\u672c\u65e0\u9700\u66f4\u65b0\u7684DOM\u5143\u7d20\u88ab\u91cd\u65b0\u6e32\u67d3\uff0c\u6d6a\u8d39\u4e86\u6027\u80fd\u3002\u800c\u5408\u7406\u7684key\u503c\u80fd\u4fdd\u6301DOM\u5143\u7d20\u7684\u7a33\u5b9a\u6027\uff0c\u4f7f\u5f97Vue\u80fd\u591f\u6b63\u786e\u5730\u590d\u7528\u548c\u79fb\u52a8\u73b0\u6709\u5143\u7d20\u3002<\/p>\n<\/p>\n

II. Vue\u4e2dKey\u7684\u6700\u4f73\u5b9e\u8df5<\/strong><\/p>\n<\/p>\n

\u56db\u3001\u9009\u62e9\u5408\u9002\u7684KEY\u503c<\/strong><\/p>\n<\/p>\n

\u9009\u62e9key\u65f6\uff0c\u5e94\u8be5\u4f7f\u7528\u5177\u6709\u552f\u4e00\u6027\u7684\u503c\uff0c\u5982\u6570\u636e\u5e93\u4e2d\u6bcf\u6761\u8bb0\u5f55\u7684id\u3002\u4e0d\u63a8\u8350\u4f7f\u7528\u6570\u7ec4\u7684\u7d22\u5f15\u4f5c\u4e3akey\uff0c\u56e0\u4e3a\u4e00\u65e6\u6570\u7ec4\u7684\u987a\u5e8f\u53d8\u5316\uff0c\u7d22\u5f15\u5c06\u53d8\u5f97\u4e0d\u518d\u51c6\u786e\uff0c\u4e0d\u80fd\u6709\u6548\u5730\u8ddf\u8e2a\u6bcf\u4e2a\u5143\u7d20\u7684\u8eab\u4efd\uff0c\u4e27\u5931\u4e86key\u672c\u6765\u7684\u610f\u4e49\u3002<\/p>\n<\/p>\n

\u4e94\u3001\u907f\u514d\u4e0d\u7a33\u5b9a\u7684KEY<\/strong><\/p>\n<\/p>\n

\u786e\u4fdd\u4f60\u4f7f\u7528\u7684key\u5177\u6709\u7a33\u5b9a\u6027\u3002\u4f8b\u5982\uff0c\u5728\u5faa\u73af\u5d4c\u5957\u4e2d\uff0c\u6211\u4eec\u9700\u8981\u786e\u4fdd\u6bcf\u4e00\u5c42\u5faa\u73af\u90fd\u6709\u4e00\u4e2a\u7a33\u5b9a\u800c\u72ec\u7279\u7684key\u503c\uff0c\u4e0d\u5e94\u4f7f\u7528\u968f\u673a\u6570\u6216\u8005\u751f\u6210\u7684hash\u503c\uff0c\u56e0\u4e3a\u8fd9\u4f1a\u5728\u6bcf\u6b21\u6e32\u67d3\u65f6\u751f\u6210\u4e0d\u540c\u7684key\uff0c\u5bfc\u81f4Vue\u65e0\u6cd5\u8ffd\u8e2a\u5230\u771f\u6b63\u7684\u5143\u7d20\u3002<\/p>\n<\/p>\n

III. V-FOR\u4e0eKEY\u7684\u5e38\u89c1\u95ee\u9898<\/strong><\/p>\n<\/p>\n

\u516d\u3001\u5728\u7ec4\u4ef6\u4e2d\u4f7f\u7528V-FOR\u4e0eKEY<\/strong><\/p>\n<\/p>\n

\u5f53\u5728\u81ea\u5b9a\u4e49\u7ec4\u4ef6\u4e0a\u4f7f\u7528v-for\u65f6\uff0c\u540c\u6837\u9700\u8981\u63d0\u4f9bkey\u503c\uff0c\u8fd9\u80fd\u786e\u4fdd\u6bcf\u4e2a\u7ec4\u4ef6\u5b9e\u4f8b\u80fd\u591f\u88ab\u6b63\u786e\u5730\u590d\u7528\u6216\u66f4\u65b0\u3002\u5c24\u5176\u662f\u7ec4\u4ef6\u5185\u90e8\u6709\u72b6\u6001\u6216\u7ed1\u5b9a\u4e86\u6570\u636e\u7684\u60c5\u51b5\u4e0b\uff0c\u7f3a\u4e4fkey\u4f1a\u5bfc\u81f4\u72b6\u6001\u9519\u4e71\u3002<\/p>\n<\/p>\n

\u4e03\u3001\u5207\u6362\u5217\u8868\u65f6\u4fdd\u7559\u72b6\u6001<\/strong><\/p>\n<\/p>\n

\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u53ef\u80fd\u9700\u8981\u5728\u5207\u6362\u5217\u8868\u65f6\u4fdd\u7559\u5b50\u7ec4\u4ef6\u7684\u72b6\u6001\u3002\u5408\u7406\u5730\u8fd0\u7528key\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u8fbe\u5230\u8fd9\u4e2a\u76ee\u7684\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u4ee5\u7528\u5217\u8868\u9879\u7684\u4e00\u4e2a\u5c5e\u6027\u6765\u751f\u6210key\u503c\uff0c\u5728\u5217\u8868\u53d8\u5316\u540e\uff0c\u53ea\u8981\u8fd9\u4e2a\u5c5e\u6027\u7684\u503c\u6ca1\u6709\u53d8\uff0c\u5bf9\u5e94\u7684\u7ec4\u4ef6\u72b6\u6001\u4fbf\u53ef\u4ee5\u88ab\u4fdd\u7559\u3002<\/p>\n<\/p>\n

IV. \u7ed3\u8bba\u4e0e\u6700\u4f73\u5b9e\u8df5<\/strong><\/p>\n<\/p>\n

Key\u7684\u4f7f\u7528\u5bf9\u4e8e\u63d0\u5347Vue\u5e94\u7528\u7684\u6027\u80fd\u81f3\u5173\u91cd\u8981\u3002\u5f00\u53d1\u8005\u5e94\u8be5\u517b\u6210\u5728\u4f7f\u7528v-for\u65f6\uff0c\u6b63\u786e\u4f7f\u7528key\u7684\u4e60\u60ef\uff0c\u5e76\u4e14\u9009\u62e9\u7a33\u5b9a\u552f\u4e00\u7684\u5c5e\u6027\u503c\u4f5c\u4e3akey\uff0c\u907f\u514d\u4f7f\u7528\u7d22\u5f15\u6216\u4e0d\u7a33\u5b9a\u7684\u503c\u3002\u5408\u7406\u5229\u7528key\u5e26\u6765\u7684\u6027\u80fd\u4f18\u5316\uff0c\u4e0d\u4ec5\u53ef\u4ee5\u63d0\u5347\u7528\u6237\u4f53\u9a8c\uff0c\u4e5f\u4f1a\u4f18\u5316\u8d44\u6e90\u7684\u4f7f\u7528\u3002<\/p>\n<\/p>\n

\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
    \n
  1. \n

    \u4e3a\u4ec0\u4e48\u5728 vue3 \u9879\u76ee\u5f00\u53d1\u4e2d\u4f7f\u7528 v-for \u9700\u8981\u6307\u5b9a key \u503c\uff1f<\/strong> \u5728 vue3 \u4e2d\uff0c\u4f7f\u7528 v-for \u6e32\u67d3\u5217\u8868\u65f6\u9700\u8981\u4e3a\u6bcf\u4e2a\u9879\u6307\u5b9a\u552f\u4e00\u7684 key \u503c\u3002\u8fd9\u662f\u56e0\u4e3a vue3 \u4f7f\u7528\u4e86\u865a\u62df DOM \u6280\u672f\uff0c\u901a\u8fc7\u6bd4\u8f83\u65b0\u65e7\u865a\u62df\u8282\u70b9\u6765\u8fdb\u884c\u9ad8\u6548\u7684\u91cd\u65b0\u6e32\u67d3\u3002\u6307\u5b9a key \u503c\u53ef\u4ee5\u5e2e\u52a9 vue3 \u66f4\u51c6\u786e\u5730\u8ffd\u8e2a\u6bcf\u4e2a\u8282\u70b9\u7684\u53d8\u5316\uff0c\u51cf\u5c11\u4e0d\u5fc5\u8981\u7684\u91cd\u65b0\u6e32\u67d3\uff0c\u63d0\u9ad8\u6027\u80fd\u3002<\/p>\n<\/li>\n

  2. \n

    \u4f7f\u7528 v-for \u6e32\u67d3\u5217\u8868\u65f6\uff0c\u4e3a\u4f55\u4e0d\u53ef\u4ee5\u4f7f\u7528 index \u4f5c\u4e3a key \u503c\uff1f<\/strong> \u4f7f\u7528 index \u4f5c\u4e3a key \u503c\u662f\u4e00\u4e2a\u5e38\u89c1\u7684\u9519\u8bef\u505a\u6cd5\u3002\u867d\u7136 index \u53ef\u4ee5\u552f\u4e00\u6807\u8bc6\u4e00\u4e2a\u9879\u5728\u6570\u7ec4\u4e2d\u7684\u4f4d\u7f6e\uff0c\u4f46\u5b83\u5e76\u4e0d\u80fd\u51c6\u786e\u5730\u53cd\u6620\u6bcf\u4e2a\u9879\u7684\u552f\u4e00\u6027\u3002\u5f53\u5217\u8868\u53d1\u751f\u53d8\u5316\u65f6\uff0c\u5982\u679c\u4ec5\u4ec5\u901a\u8fc7 index \u8fdb\u884c\u6bd4\u8f83\uff0cvue3 \u53ef\u80fd\u4f1a\u9519\u8bef\u5730\u8ba4\u4e3a\u4e24\u4e2a\u9879\u662f\u540c\u4e00\u4e2a\uff0c\u5bfc\u81f4\u4e0d\u6b63\u786e\u7684\u66f4\u65b0\u3002\u56e0\u6b64\uff0c\u5efa\u8bae\u4f7f\u7528\u6bcf\u4e2a\u9879\u81ea\u8eab\u5177\u6709\u7684\u552f\u4e00\u6807\u8bc6\u4f5c\u4e3a key \u503c\uff0c\u6bd4\u5982\u4e00\u4e2a\u72ec\u7279\u7684 ID\u3002<\/p>\n<\/li>\n

  3. \n

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