Set The default lookup entity in crm 2013

Set the default lookup entity in ms crm 2013(In Case customer Lookup )

i tried the below code but its not working 

document.getElementById('customerid').setAttribute('defaulttype', '2');
Xrm.Page.getControl('customerid').setDefaultView('A2D479C5-53E3-4C69-ADDD-802327E67A0D');

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ms crm