我有7天在所有论坛中进行搜索。很难，也许这种情况很特殊：（非常感谢您的帮助...）

    const ARRAY1 = [



      { Ville:  'Anse-bertrand (97121)',taux: 0.6393  },{ Ville: 'Saint-Louis (97421)',taux: 0.6359  },{ Ville:  'La Haute-Beaume (05140)',taux:    0.5900  },{ Ville:  'Fontanès-de-Sault (11140)',taux:  0.5791  },{ Ville:  'Chambord (41250)',taux:   0.5658  }


    ]


    const ARRAY2 = (ARRAY1.Ville.replace(/\d/g,""))
    //i want to replace all characteres of all (Ville) by "_". To just have the postal codes.

    var KeySearched = "05140"



    function isTaux (answer) {
      return answer.Ville ==KeySearched ;
    }

    console.log(ARRAY2.find(isTaux).taux);