{"id":1472,"date":"2016-01-31T17:07:18","date_gmt":"2016-01-31T09:07:18","guid":{"rendered":"http:\/\/www.daliane.com\/?p=1472"},"modified":"2016-01-31T17:13:45","modified_gmt":"2016-01-31T09:13:45","slug":"lodash_shi_you_yi_chang_ge_ming_underscore_zhong_jiang_bei_qu_dai","status":"publish","type":"post","link":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/lodash_shi_you_yi_chang_ge_ming_underscore_zhong_jiang_bei_qu_dai\/","title":{"rendered":"lodash\u662f\u53c8\u4e00\u573a\u9769\u547d\uff0cUnderscore\u7ec8\u5c06\u88ab\u53d6\u4ee3"},"content":{"rendered":"
\n
\n

\u4f60\u8fd8\u5728\u4e3aJavaScript\u4e2d\u7684\u6570\u636e\u8f6c\u6362\u3001\u5339\u914d\u3001\u67e5\u627e\u7b49\u70e6\u607c\u5417\uff1f\u4e00\u5806\u770b\u4f3c\u7b80\u5355\u7684foreach\uff0c\u5374\u5197\u957f\u65e0\u8da3\uff0c\u53ef\u4ecd\u8fd8\u5728\u4e0d\u505c\u7684repeat it\uff01\u4e5f\u8bb8\u4f60\u5df2\u7ecf\u7528\u4e0a\u4e86Underscore.js\uff0c\u4e0d\u9519\uff0c\u4f60\u5df2\u7ecf\u8fdb\u6b65\u5f88\u5927\u4e00\u6b65\u4e86\u3002\u7136\u800c\u4eca\u5929\u6211\u5e0c\u671b\u4f60\u80fd\u66f4\u8fdb\u4e00\u6b65\uff0c\u5229\u7528lodash\u66ff\u6362\u6389Underscore\u3002<\/p>\n

lodash\u4e00\u5f00\u59cb\u662fUnderscore.js\u5e93\u7684\u4e00\u4e2afork\uff0c\u56e0\u4e3a\u548c\u5176\u4ed6(Underscore.js\u7684)\u8d21\u732e\u8005\u610f\u89c1\u76f8\u5de6\u3002John-David Dalton\u7684\u6700\u521d\u76ee\u6807\uff0c\u662f\u63d0\u4f9b\u66f4\u591a\u201c\u4e00\u81f4\u7684\u8de8\u6d4f\u89c8\u5668\u884c\u4e3a\u2026\u2026\uff0c\u5e76\u6539\u5584\u6027\u80fd\u201d\u3002\u4e4b\u540e\uff0c\u8be5\u9879\u76ee\u5728\u73b0\u6709\u6210\u529f\u7684\u57fa\u7840\u4e4b\u4e0a\u53d6\u5f97\u4e86\u66f4\u5927\u7684\u6210\u679c\u3002\u6700\u8fd1lodash\u4e5f\u53d1\u5e03\u4e863.5\u7248\uff0c\u6210\u4e3a\u4e86npm\u5305\u4ed3\u5e93\u4e2d\u4f9d\u8d56\u6700\u591a\u7684\u5e93\u3002\u5b83\u6b63\u5728\u6446\u8131\u5c4c\u4e1d\u8eab\u4efd\uff0c\u6210\u4e3a\u5f00\u53d1\u8005\u7684\u5e38\u89c4\u7684\u9009\u62e9\u4e4b\u4e00\u3002<\/p>\n

\u73b0\u5728\u6211\u4eec\u6240\u719f\u77e5\u7684\u5f88\u591a\u5f00\u6e90\u9879\u76ee\u90fd\u5df2\u7ecf\u4f7f\u7528\u6216\u8005\u8f6c\u5230\u4e86lodash\u9635\u8425\u4e4b\u4e0a\u3002\u6bd4\u5982JavaScript\u8f6c\u8bd1\u5668Babel\u3001\u535a\u5ba2\u5e73\u53f0Ghost\uff0c\u548c\u9879\u76ee\u811a\u624b\u67b6\u5de5\u5177Yeoman\u3002\u7279\u522bGhost\u662f\u4eceUnderscore\u8fc1\u79fb\u5230\u4e86lodash\uff0cGhost\u7684\u521b\u59cb\u4ebaJohn O\u2019Nolan\u5bf9\u4e8e\u6b64\u66fe\u8bc4\u4ef7\u5230\uff1a\u201c\u8fd9\u662f\u4e00\u4e2a\u975e\u5e38\u660e\u667a\u7684\u9009\u62e9\uff0c\u5b83\u51e0\u4e4e\u5b8c\u5168\u662f\u7531\u6211\u4eec\u5f00\u6e90\u5f00\u53d1\u793e\u533a\u63a8\u52a8\u7684\u3002\u6211\u4eec\u53d1\u73b0lodash\u5305\u542b\u66f4\u591a\u7684\u529f\u80fd\uff0c\u66f4\u597d\u7684\u6027\u80fd\u3001\u6070\u5230\u597d\u5904\u5730\u4f7f\u7528\u4e86semver\uff0c\u5e76\u4e14\u5728Node.js\u793e\u533a\uff08\u4ee5\u53ca\u5176\u4ed6\u4f9d\u8d56\uff09\u4e2d\u8d8a\u6765\u8d8a\u62a2\u773c\u201c\u3002<\/p>\n

lodash\u6f14\u7ec3<\/h2>\n

lodash\u4e3b\u8981\u4f7f\u7528\u4e86\u5ef6\u8fdf\u8ba1\u7b97\uff0c\u4f7f\u5f97lodash\u5176\u6027\u80fd\u8fdc\u8fdc\u8d85\u8fc7Underscore\u3002\u5728lodash\u4e2d\u5ef6\u8fdf\u8ba1\u7b97\u610f\u5473\u7740\u5728\u6211\u4eec\u7684\u94fe\u5f0f\u65b9\u6cd5\u5728\u663e\u793a\u6216\u9690\u5f0f\u7684value()\u8c03\u7528\u4e4b\u524d\u662f\u4e0d\u4f1a\u6267\u884c\u7684\u3002\u7531\u4e8e\u8fd9\u79cd\u6267\u884c\u7684\u5ef6\u540e\uff0c\u56e0\u6b64lodash\u53ef\u4ee5\u8fdb\u884cshortcut fusion\u8fd9\u6837\u7684\u4f18\u5316\uff0c\u901a\u8fc7\u5408\u5e76\u94fe\u5f0fiteratee\u5927\u5927\u964d\u4f4e\u8fed\u4ee3\u7684\u6b21\u6570\u3002\u4ece\u800c\u5927\u5927\u63d0\u4f9b\u5176\u6267\u884c\u6027\u80fd\u3002<\/p>\n

\"68147f68jw1eqr5g6fttxj208c08cmx1\"<\/p>\n

\u767e\u8bf4\u4e0d\u5982\u4e00\u7ec3\uff0c\u4e0b\u9762\u6211\u4eec\u4ee5\u7528\u6237\u4fe1\u606f\u4e3a\u4f8b\uff1a<\/p>\n

var users = [\r\n  { 'user': 'barney',  'age': 36 },\r\n  { 'user': 'fred',    'age': 40 },\r\n  { 'user': 'pebbles', 'age': 18 }\r\n];\r\n<\/code><\/pre>\n
1.\u83b7\u53d6\u6240\u6709\u7528\u6237\u540d\u5b57\uff0c\u5e76\u4ee5\u201d\uff0c\u201c\u5206\u5272<\/h4>\n
var names = _.chain(users)\r\n  .map(function(user){\r\n    return user.user;\r\n  })\r\n  .join(\" , \")\r\n  .value();\r\nconsole.log(names);\r\n<\/code><\/pre>\n
\u4e2a\u4eba\u6bd4\u8f83\u559c\u6b22lodash\u5ef6\u8fdf\u8ba1\u7b97\u7684\u73b0\u5b9evalue\uff0c\u4ee5\u53caJavaScript\u7684\u51fd\u6570\u5f0f\u98ce\u683c\u3002\u5728\u8fd9\u91cc\u9996\u5148\u5c06users\u5bf9\u8c61\u5305\u88c5\u6210\u4e3alodash\u5bf9\u8c61\uff0c\u518dmap\u83b7\u53d6\u6240\u6709\u7528\u6237\u7684\u540d\u79f0\uff0c\u5e76\u6700\u540e\u5229\u7528join\u5c06\u7528\u6237\u540d\u79f0\u4ee5\u201d\uff0c\u201c\u8fde\u63a5\u5728\u4e00\u8d77\u3002\u6ce8\u610f\u8fd9\u91cc\u53ea\u662f\u4e00\u4e32\u65b9\u6cd5\u94fe\uff0c\u5982\u679c\u4f60\u6ca1\u6709\u663e\u6837\u7684\u8c03\u7528value\u65b9\u6cd5\uff0c\u4f7f\u5176\u7acb\u5373\u6267\u884c\u7684\u5316\uff0c\u4f60\u5c06\u4f1a\u5f97\u5230\u5982\u4e0b\u7684LodashWrapper\u5ef6\u8fdf\u8868\u8fbe\u5f0f\uff1a<\/p>\n
 LodashWrapper {__wrapped__: LazyWrapper, __actions__: Array[1], __chain__: true, constructor: function, after: function\u2026}\r\n<\/code><\/pre>\n
\u56e0\u4e3a\u5ef6\u8fdf\u8868\u8fbe\u5f0f\u7684\u5b58\u5728\uff0c\u56e0\u6b64\u6211\u4eec\u53ef\u4ee5\u591a\u6b21\u589e\u52a0\u65b9\u6cd5\u94fe\uff0c\u4f46\u8fd9\u5e76\u4e0d\u4f1a\u88ab\u6267\u884c\uff0c\u6240\u4ee5\u4e0d\u4f1a\u5b58\u5728\u6027\u80fd\u7684\u95ee\u9898\uff0c\u6700\u540e\u77e5\u9053\u6211\u4eec\u9700\u8981\u4f7f\u7528\u7684\u65f6\u5019\uff0c\u4f7f\u7528value\u663e\u5f0f\u7acb\u5373\u6267\u884c\u5373\u53ef\u3002<\/p>\n
2. \u83b7\u53d6\u6700\u5e74\u8f7b\u7684\u7528\u6237<\/h4>\n
 var youngest = _.chain(users)\r\n  .min(function(user){\r\n    return user.age;\r\n  })\r\n  .value();\r\nconsole.log(youngest);\r\n<\/code><\/pre>\n
\u8fd9\u91cc\u5229\u7528\u4e86lodash\u63d0\u4f9b\u7684min\u51fd\u6570\u53ef\u4ee5\u8f7b\u6613\u7684\u89e3\u51b3\u3002<\/p>\n
\u5728\u8fd9\u91cc\u535a\u4e3b\u8fd8\u5e0c\u671b\u7528\u53e6\u5916\u4e00\u4e2a\u65b9\u5f0f\u89e3\u91calodash\u65b9\u6cd5\u94fe\u7684\u4f18\u5316,\u4e0a\u9762\u7684\u65b9\u6cd5\u53ef\u4ee5\u7b49\u4ef7\u4e3a\u4e0b\u9762\u7684\u65b9\u5f0f\uff0c\u4ee5age\u6392\u5e8f\u7684\u7b2c\u4e00\u4e2auser\uff1a<\/p>\n
var youngest2 = _.chain(users)\r\n  .sortBy(\"age\")\r\n  .map(function(user){\r\n    console.log(\"map\", user);\r\n    return user;\r\n  })\r\n  .first()\r\n  .value();\r\nconsole.log(youngest2);\r\n<\/code><\/pre>\n
\u5728\u8fd9\u91cc\u535a\u4e3b\u591a\u52a0\u4e86\u4e00\u4e2amap\u4f5c\u4e3alog\u8f93\u51fa\uff0c\u5982\u679c\u4f60\u6267\u884c\u8fd9\u884c\u4ee3\u7801\u7684\u65f6\u5019\uff0c\u4f60\u4f1a\u60ca\u5947\u7684\u770b\u89c1\u8fd9\u91cc\u53ea\u4f1a\u6709\u4e00\u4e2auser\u7684\u8f93\u51fa\uff0c\u8fd9\u70b9\u53ef\u4ee5\u8bc1\u660e\u5728\u7acb\u5373\u6267\u884c\u7684\u65f6\u5019lodash\u4e3a\u6211\u4eec\u7684\u65b9\u6cd5\u94fe\u505a\u4e86\u53ef\u9760\u7684\u4f18\u5316\uff1b\u5982\u679c\u6211\u4eec\u53bb\u6389first\u51fd\u6570\u4f60\u5219\u4f1a\u770b\u89c1\u67093\u4e2auser\u5bf9\u8c61\u7684\u8f93\u51fa\u3002<\/p>\n
3. \u83b7\u53d6\u6700\u5e74\u957f\u7684\u7528\u6237<\/h4>\n
var oldest  = _.chain(users)\r\n  .max(function(user){\r\n    return user.age;\r\n  })\r\n  .value();\r\n\r\nconsole.log(oldest );\r\n<\/code><\/pre>\n
\u8fd9\u91cc\u5219\u4f7f\u7528lodash\u7684max\u51fd\u6570\u3002<\/p>\n
4. \u7528\u6237\u6570\u7ec4\u5230\u7528\u6237Map\u7684\u8f6c\u6362<\/h4>\n
\u5728\u5f00\u53d1\u4e2d\u6211\u4eec\u7ecf\u5e38\u4f1a\u6709\u628a\u4e00\u5806\u7d20\u7ec4\u5f62\u5f0f\u7684\u6570\u636e\u8f6c\u6362\u4e3aObject\u5f62\u5f0f\u7684\u6570\u7ec4\uff0c\u4fbf\u4e8e\u6839\u636e\u5c5e\u6027key\u503c\u67e5\u627e\uff0c\u4e0b\u9762\u5c06\u4ee5user\u5bf9\u8c61\u6765\u6f14\u793a\uff1a<\/p>\n
var userObj = _.chain(users)\r\n  .map(function(user){\r\n    return [user.user, user.age];\r\n  })\r\n  .zipObject()\r\n  .value();\r\nconsole.log(userObj);\r\n<\/code><\/pre>\n
\u5229\u7528lodash\u9996\u5148\u5c06user\u6570\u7ec4map\u4e3a[key, value]\u7684\u6570\u7ec4\u96c6\u5408\uff0c\u6700\u540e\u5229\u7528zipObject\u5c06\u7ed3\u679c\u8f6c\u6362\u4e3aObject\u5bf9\u8c61\uff0czipObject\u4f1a\u5229\u7528\u7ed3\u679c\u96c6\u7684\u7b2c\u4e00\u9879\u4f5c\u4e3akey\uff0c\u7b2c\u4e8c\u9879\u4f5c\u4e3avalue\u751f\u4ea7Object\u3002<\/p>\n
\u7ed3\u5c3e<\/h2>\n
\u6211\u4eec\u5728\u8fd9\u91cc\u5c55\u793a\u77e5\u8bc6lodash\u4e2d\u5f88\u5c0f\u4e00\u90e8\u5206\u7684API\uff0c\u6b63\u5982\u968f\u7b14\u5f00\u59cb\u6240\u8bf4\uff1alodash\u662f\u4e3a\u4e86\u63d0\u4f9b\u66f4\u591a\u201c\u4e00\u81f4\u7684\u8de8\u6d4f\u89c8\u5668\u884c\u4e3a\u2026\u2026\uff0c\u5e76\u6539\u5584\u6027\u80fd\u201dAPI\u3002\u6240\u6709\u7684lodash API\u4f60\u53ef\u4ee5\u5728\u8fd9\u91cchttps:\/\/lodash.com\/docs#matches<\/a>\u67e5\u627e\u3002<\/p>\n
\u672c\u6587\u7684\u6240\u6f14\u793a\u7684demo\uff0c\u4f60\u4e5f\u53ef\u4ee5\u5728jsbin http:\/\/jsbin.com\/xocixubaru\/1\/edit?html,js,output<\/a>\u6f14\u793a\u3002<\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
\u4f60\u8fd8\u5728\u4e3aJavaScript\u4e2d\u7684\u6570\u636e\u8f6c\u6362\u3001\u5339\u914d\u3001\u67e5\u627e\u7b49\u70e6\u607c\u5417\uff1f\u4e00\u5806\u770b\u4f3c\u7b80\u5355\u7684foreach\uff0c\u5374\u5197\u957f\u65e0\u8da3\uff0c\u53ef\u4ecd\u8fd8…<\/p>\n","protected":false},"author":1,"featured_media":1473,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"footnotes":""},"categories":[38],"tags":[114,115],"_links":{"self":[{"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/posts\/1472"}],"collection":[{"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/comments?post=1472"}],"version-history":[{"count":1,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/posts\/1472\/revisions"}],"predecessor-version":[{"id":1474,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/posts\/1472\/revisions\/1474"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/media\/1473"}],"wp:attachment":[{"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/media?parent=1472"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/categories?post=1472"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/tags?post=1472"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}