{"id":11883,"date":"2025-09-30T10:57:06","date_gmt":"2025-09-30T02:57:06","guid":{"rendered":"https:\/\/www.zhangxinxu.com\/wordpress\/?p=11883"},"modified":"2026-01-04T09:02:05","modified_gmt":"2026-01-04T01:02:05","slug":"js-intl-segmenter-string-length","status":"publish","type":"post","link":"https:\/\/www.zhangxinxu.com\/wordpress\/2025\/09\/js-intl-segmenter-string-length\/","title":{"rendered":"\u4f7f\u7528Intl.Segmenter\u8fd4\u56de\u66f4\u51c6\u786e\u7684\u5b57\u7b26\u957f\u5ea6"},"content":{"rendered":"

by zhangxinxu<\/a> from https:\/\/www.zhangxinxu.com\/wordpress\/?p=11883<\/a>
\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

\"\u5206\u8bcd\u4e0e\u5b57\u7b26\u957f\u5ea6\"<\/p>\n

\u4e00\u3001Emoji\u5b57\u7b26\u957f\u5ea6\u95ee\u9898<\/h3>\n

\u6211\u4eec\u5e73\u5e38\u83b7\u53d6\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\u90fd\u662f\u76f4\u63a5\u4f7f\u7528length\u5c5e\u6027\uff0c\u4f46\u5bf9\u4e8e\u67d0\u4e9b\u5b57\u7b26\uff0c\u8fd4\u56de\u7684\u7ed3\u679c\u4f1a\u5728\u9884\u671f\u4e4b\u5916\uff0c\u4f8b\u5982\uff1a<\/p>\n

\"\u946b\u7a7a\u95f4\".length\r\n\r\n\"\ud83c\udf1d\".length\r\n\r\n\"\ud83c\uddee\ud83c\uddf3\".length\r\n\r\n\"\ud83d\udc68\u200d\ud83d\udc69\u200d\ud83d\udc67\u200d\ud83d\udc66\".length\r\n\r\n\"\u0926\u0930\u092c\u093e\u0930\".length<\/pre>\n
\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n
\"\u946b\u7a7a\u95f4\".length \/\/ 3\r\n\r\n\"\ud83c\udf1d\".length    \/\/ 2\r\n\r\n\"\ud83c\uddee\ud83c\uddf3\".length    \/\/ 4\r\n\r\n\"\ud83d\udc68\u200d\ud83d\udc69\u200d\ud83d\udc67\u200d\ud83d\udc66\".length    \/\/ 11\r\n\r\n\"\u0926\u0930\u092c\u093e\u0930\".length  \/\/ 5<\/pre>\n
\u770b\u5230\u6ca1\uff0c\u770b\u8d77\u6765Emoji\u8868\u60c5\u5b57\u7b26\u7684\u957f\u5ea6\u662f1\uff0c\u4f46\u662f\uff0c\u5b9e\u9645\u8fd4\u56de\u7684Emoji\u957f\u5ea6\u5e76\u4e0d\u662f1\uff0c\u4e0d\u4ec5\u4e0d\u662f1\uff0c\u4e0d\u540c\u7684Emoji\u8fd4\u56de\u7684\u957f\u5ea6\u8fd8\u4e0d\u4e00\u6837\uff0c\u8fd9\u5c31\u4f1a\u7ed9\u6211\u4eec\u7cbe\u786e\u7edf\u8ba1\u5b57\u7b26\u957f\u5ea6\u5e26\u6765\u56f0\u6270\u3002<\/p>\n
\u600e\u4e48\u529e\u5462\uff1f<\/p>\n
\u4e8c\u3001\u8fd4\u56de\u5b57\u7b26\u7684\u771f\u5b9e\u957f\u5ea6<\/h3>\n
\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528Intl.Segmenter()\u8fd4\u56de\u5b57\u7b26\u4e32\u7684\u771f\u5b9e\u957f\u5ea6\uff1a<\/p>\n
Array.from(\r\n  new Intl.Segmenter(\"en\", {\r\n    \/\/ \u9897\u7c92\u5ea6\uff1a\u5b57\u4f4d\uff0c\u9ed8\u8ba4\u503c\uff0c\u53ef\u7701\u7565\r\n    granularity: \"grapheme\" \r\n  }).segment(this)\r\n).length<\/pre>\n
\u4e0d\u8fc7\u4e0a\u9762\u4ee3\u7801\u4e0d\u592a\u597d\u8bb0\u5fc6\uff0c\u6211\u4eec\u4e0d\u59a8\u7ed9\u5b57\u7b26\u4e32\u6269\u5c55\u4e00\u4e2a\u540d\u4e3a realLength \u7684\u65b9\u6cd5\uff0c\u5b8c\u6574\u4ee3\u7801\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n
Object.defineProperty(String.prototype, 'realLength', {\r\n  get: function() {\r\n    return Array.from(\r\n      new Intl.Segmenter(\"en\").segment(this)\r\n    ).length;\r\n  }\r\n});<\/pre>\n
\u6b64\u65f6\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u8fd4\u56de\u5b57\u7b26\u4e32\u771f\u5b9e\u7684\u957f\u5ea6\u4e86\u3002<\/p>\n
\"\u946b\u7a7a\u95f4\".realLength \/\/ 3\r\n\r\n\"\ud83c\udf1d\".realLength    \/\/ 1\r\n\r\n\"\ud83c\uddee\ud83c\uddf3\".realLength    \/\/ 1\r\n\r\n\"\ud83d\udc68\u200d\ud83d\udc69\u200d\ud83d\udc67\u200d\ud83d\udc66\".realLength    \/\/ 1\r\n\r\n\"\u0926\u0930\u092c\u093e\u0930\".realLength  \/\/ 4<\/pre>\n
\u662f\u4e0d\u662f\u5f88\u7f8e\u4e3d\uff1f<\/p>\n
\"\u7d2b\u7075\"<\/p>\n
\u4e09\u3001Emoji\u5b57\u7b26\u957f\u5ea6\u4e0d\u662f1\u7684\u539f\u56e0<\/h3>\n
JavaScript\u4f7f\u7528UTF-16\u7f16\u7801\uff0c\u8fd9\u79cd\u7f16\u7801\u65b9\u5f0f\u6700\u591a\u652f\u6301 2x 16<\/sup> \u5171 65,536 \u4e2a\u5b57\u7b26\uff0c6\u4e07\u591a\u4e2a\u5b57\u7b26\u770b\u8d77\u6765\u591a\uff0c\u4f46\u662f\u4e16\u754c\u4e0a\u90a3\u4e48\u591a\u8bed\u8a00\uff0c\u5df2\u7ecf\u4e0d\u591f\u7528\u4e86\uff0c\u5c24\u5176Emoji\u8868\u60c5\u5b57\u7b26\uff0c\u90fd\u572865,536 \u4e2a\u5b57\u7b26\u5f00\u5916\u3002<\/p>\n
JS\u60f3\u8981\u8868\u793a\uff0c\u53ea\u80fd\u7ec4\u5408\u591a\u4e2a\u7279\u6b8a\u7684 2 \u5b57\u8282\u4ee3\u7801\u5355\u5143\u4ee5\u751f\u6210\u4eba\u7c7b\u53ef\u8bfb\u7684\u5b57\u7b26\u3002<\/p>\n
\u4f8b\u5982\uff1a<\/p>\n
Array.from({ length: \"\ud83c\udf1d\".length }, (_, i) => \"\ud83c\udf1d\"[i])\r\n\/\/ [ '\\ud83c', '\\udf1d' ]<\/pre>\n
\u4e8e\u662f\uff0cJS\u4ee3\u7801\u76f4\u63a5\u4f7f\u7528length\u5c5e\u6027\u8bbf\u95ee\u7684\u65f6\u5019\uff0c\u8fd4\u56de\u503c\u5c31\u662f2\uff0c\u4f46\u662f\u4eba\u7c7b\u7406\u89e3\u80af\u5b9a\u662f1\u4e2a\u5b57\u7b26\u3002<\/p>\n
\u8fd9\u5c31\u662fEmoji\u5b57\u7b26\u957f\u5ea6\u4e0d\u662f1\u7684\u539f\u56e0\u3002<\/p>\n
\u53e6\u5916\u8865\u5145\u4e00\u70b9\uff0c\u4e0d\u5c11\u5f00\u53d1\u4eba\u5458\u76f4\u63a5\u4f7f\u7528Array.from()<\/code>\u65b9\u6cd5\u8fd4\u56de\u957f\u5ea6\uff0c\u5c31\u50cf\u8fd9\u6837\uff1a<\/p>\n
Array.from(\"\ud83c\udf1d\").length; \/\/ \u7ed3\u679c\u662f1<\/pre>\n
\u4f46\u662f\uff0c\u5e76\u4e0d\u662f\u6240\u6709Emoji\u90fd\u8fd4\u56de\u7684\u662f1\uff0c\u4f8b\u5982\uff1a<\/p>\n
Array.from(\"\ud83d\udc68\u200d\ud83d\udc69\u200d\ud83d\udc67\u200d\ud83d\udc66\").length; \/\/ \u7ed3\u679c\u662f7<\/pre>\n
\u8fd4\u56de\u7684\u957f\u5ea6\u5c31\u662f7\uff0c\u5c31\u4e0d\u5bf9\u4e86\u3002<\/p>\n
\u56db\u3001\u5173\u4e8eIntl.Segmenter<\/h3>\n
Intl.Segmenter \u662f JavaScript \u4e2d\u4e00\u4e2a\u4e13\u95e8\u7528\u4e8e\u6587\u672c\u5206\u6bb5\u7684\u5f3a\u5927\u5de5\u5177\uff0c\u5b83\u80fd\u591f\u6839\u636e\u4e0d\u540c\u7684\u8bed\u8a00\u548c\u6587\u672c\u89c4\u5219\uff0c\u5c06\u5b57\u7b26\u4e32\u667a\u80fd\u5730\u5206\u5272\u6210\u6709\u610f\u4e49\u7684\u5355\u4f4d\uff0c\u5982\u5b57\u7b26\u3001\u5355\u8bcd\u6216\u53e5\u5b50\u3002<\/p>\n
\u6838\u5fc3\u6982\u5ff5\u4e0e\u8bed\u6cd5<\/h4>\n
Intl.Segmenter \u7684\u6838\u5fc3\u4f5c\u7528\u5728\u4e8e\u8fdb\u884c\u8bed\u8a00\u654f\u611f\u7684\u5206\u6bb5\u3002<\/p>\n
\u4f20\u7edf\u7684\u5b57\u7b26\u4e32\u5206\u5272\u65b9\u6cd5\uff08\u5982 split(‘ ‘)\uff09\u5bf9\u4e8e\u82f1\u8bed\u8fd9\u7c7b\u4f7f\u7528\u7a7a\u683c\u5206\u9694\u5355\u8bcd\u7684\u8bed\u8a00\u52c9\u5f3a\u9002\u7528\uff0c\u4f46\u5bf9\u4e8e\u4e2d\u6587\u3001\u65e5\u6587\u7b49\u4e0d\u4f9d\u8d56\u7a7a\u683c\u7684\u8bed\u8a00\u5c31\u65e0\u80fd\u4e3a\u529b\u4e86\uff0c\u751a\u81f3\u5904\u7406\u5305\u542b\u590d\u6742\u8868\u60c5\u7b26\u53f7\uff08Emoji\uff09\u7684\u6587\u672c\u65f6\u4e5f\u4f1a\u51fa\u9519\u3002<\/p>\n
Intl.Segmenter \u5219\u4f9d\u636e Unicode \u6807\u51c6\uff0c\u80fd\u591f\u7406\u89e3\u4e0d\u540c\u8bed\u8a00\u7684\u8bed\u6cd5\u4e60\u60ef\uff0c\u8fdb\u884c\u7cbe\u51c6\u7684\u8fb9\u754c\u68c0\u6d4b\u3002<\/p>\n
\u4f7f\u7528\u793a\u610f\uff1a<\/p>\n
const segmenter = new Intl.Segmenter([locales[, options]]);<\/pre>\n
\u5176\u4e2d\uff1a<\/p>\n
\n
locales<\/strong><\/dt>\n
\u8868\u793a\u8bed\u8a00\uff0c\u4f7f\u7528\u4e00\u4e2a BCP 47 \u8bed\u8a00\u6807\u7b7e\u7684\u5b57\u7b26\u4e32\uff0c\u5982 “zh-CN”\u3001”en-US”\u3001”ja”\u7b49\u3002\u5b83\u6307\u5b9a\u4e86\u5206\u6bb5\u6240\u4f9d\u636e\u7684\u8bed\u8a00\u89c4\u5219\u3002\u5982\u679c\u7701\u7565\uff0c\u5219\u4f1a\u4f7f\u7528\u8fd0\u884c\u65f6\u73af\u5883\u7684\u9ed8\u8ba4\u8bed\u8a00\u8bbe\u7f6e\u3002<\/dd>\n
options<\/dt>\n
\u53ef\u9009\u53c2\u6570\uff0c\u5305\u62ec\u4e0b\u9762\u8fd9\u4e9b\uff1a<\/dd>\n<\/dl>\n
granularity<\/strong><\/p>\n
\u8868\u793a\u5206\u6bb5\u7684\u7c92\u5ea6\uff0c\u662f\u6700\u91cd\u8981\u7684\u9009\u9879\u3002\u53ef\u53d6\u503c\u4e3a\uff1a<\/p>\n