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['a', 'b', 'callback'],\n        4: ['a', 'b', 'c', 'callback'],\n        5: ['a', 'b', 'c', 'd', 'callback'] // require\n    });\n\n    //update the params\n    a        = args.a;\n    b        = args.b;\n    c        = args.c;\n    d        = args.d;\n    callback = args.callback;\n\n    console.log(args);\n}\n\ntesting('a_val');\n// =\u003e false\n\ntesting('a_val', function callback(){});\n// =\u003e { a: 'a_val', callback: [Function: callback] }\n\ntesting('a_val', 'b_val', function callback(){});\n// =\u003e { a: 'a_val', b: 'b_val', callback: [Function: callback] }\n\ntesting('a_val', 'b_val', 'c_val', function callback(){});\n// =\u003e { a: 'a_val', b: 'b_val', c: 'c_val', callback: [Function: callback] }\n```\n\n##usage\n\n* rules: ``object`` set the function rules, key is the number of the passing params. 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