js对象

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irstName and a property (prop) as arguments has been pre-written for you. irstName is an actual contact's firstName and the given property (prop) is a property of that contact. irstName does not correspond to any contacts then return "No such contact"   contacts             irstName"                         brownie Points"                 irstName"         otter"                                 irstName"                                         irstName"                 Nown"               lookUpProfilefirstName prop   contactJSON.JSON.contacts     flag j tag     i icontact.i       contacti.irstNamefirstName         flag         ji                         flag                                contactjprop                                   contactjprop                                 lookUpProfile