How can I get form data with JavaScript/jQuery?

Question

Is there a simple, one-line way to get the data of a form as it would be if it was to be submitted in the classic HTML-only way?

For example:

Answer 1

Based on jQuery.serializeArray, returns key-value pairs.

var data = $('#form').serializeArray().reduce(function(obj, item) {
    obj[item.name] = item.value;
    return obj;
}, {});