javascript - Cannot get right value from XML -

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i have below xml 

 <person>     <age>10></age>     <name>jason</name>     <bankdetails>        <bankname>wfc</bankname>        <accountno>xxx</accountno>     </bankdetails>   <person>

in code if try access person.bankdetails.bankname or other field in bankdetails structure getting undefined. how calling 

$value.bankdetails.bankname

here $value being passed root , works fine other param not bankname , accountno

try change bankname bankname on codes why giving undefined error try code

 <person> <age>10></age> <name>jason</name> <bankdetails>    <bankname>wfc</bankname>    <accountno>xxx</accountno> </bankdetails>


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