jQuery: Best way to disabled input

Which is best?
$('#xyz').attr("disabled", true); 
$('#xyz').attr("disabled", "true"); 
$('#xyz').attr("disabled", "disabled"); 

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$('#xyz').attr("disabled", "disabled"); ¿
or :
$('#xyz').attr("disabled", ""); ¿


in the jQuery plugin you can find this line :
elem.setAttribute( name, "" + value );

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where elem is your input
name is the disabled attribute
the second argument is a string
Use .prop() - http://api.jquery.com/prop/

$('#elem').prop('disabled', true)
$('#elem').prop('disabled', false)

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Kiran SonawaneProject LeadCommented:
If you are using latest version of jquery then use prop otherwise $('#xyz').attr("disabled", "disabled");
I prefer:

$('#xyz').attr( { disabled: true } );

because you can add more stuff:

$('#xyz').attr( { disabled: true, value: "Locked" } );

works with prop too:

$('#xyz').prop( { disabled: true } );
$('#xyz').prop( { disabled: true, value: "Locked" } );

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