key-by-val:通过对象中的值查找键

按值 我似乎发现自己经常需要 var kByV = require ( 'key-by-val' ) var consts = { public : 1 , private : 2 , happy : 3 } var blah = { type : 3 } var typeName = kByV ( consts , blah . type ) // === 'happy'