jQuery Object Serialize

What is the difference between this?

$("form").serialize();

and this?

var theForm = $("form");
$(theForm[0]).serialize();

How do you get the second sample to serialize like开发者_运维问答 the first one?

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try this:

var theForm = $("form");
theForm.eq(0).serialize();

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First one selects all forms and serializes all form fields.

Second one selects form fields from FIRST form and serializes them

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Or you could use in one line:

$("form:first").serialize();