[jQuery] can not access elements' properties any more?

[jQuery] can not access elements' properties any more?

hi.
use $() to select elements, why its properties are not able to access anymore? for exsample: ( #f-name is an input element )
alert(document.getElementById("f-name").type);
alert($("#f-name").type);
line 2 will return undefined. perhaps it is  jQuery's limited? IMHO,  if line 2 can work, jQuery will be more powerful.<br clear="all">
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