按下回车键时加载路径JSON

I need have to carry the description of the title when clicking "enter", I created a variable for the path of the description:

var descri = json.query.results.channel.item.map(function (item) {
    return item.summary;

});

And this code, jQuery to call the the variable when you click enter:

$(document).on('keypress', function (e) {

    if (e.which == 13) {

        //I think the error is here:
        $('.description').html('descri');
    }
    e.preventDefault();
});

jsfiddle

Use this

success: function (json) {

    /* Other things */

    // description
    var description = json.query.results.channel.item.map(function (item) {
        return item.summary;
    });
    // Call Ajax Key Enter
    $(document).on('keypress', function (e) {
        if (e.which == 13) {
            $('.description').html(description);
        }
        e.preventDefault();
    });

    /* Other things */

}

Demo: http://jsfiddle.net/2NmnB/2/

If I understood your question correctly then here is your answer below.

if (e.which == 13) {
    $('.description').html($(".nav_holder li.selected").text());

}