javascript - how to access object property using variable -

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i have object 

var messages = { 'fullname' : 'tell cool name dude..! e.g. yousuf iqbal', 'username' : 'choose catchy username. remember! should available :)', 'password' : 'choose top secret password special chars, numbers , alphabets', 'repassword' : 'retype password typed. but, don\'t try copy!', 'byear' : 'tell year, in bomb blasted' };

and variable..

var attribute = $('#userinfo form input').attr('name');

now want select messages object property using variable this..

var message = messages.attribute;

but not working.. , have tried following..

var message = messages+'.'+attribute;

square brackets:

message = messages[ attribute ];

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