<input type = "text" value = "1" name = "id">
<input type = "text" value = "+" name = "increase">

как при помощи JQuery при нажатии на increase увеличить name = id на +1?

нет необходимости в JQ

<input type = "text" id="data" value = "1" name = "id"/>
<input type = "button" value = "+" onclick = "document.getElementById('data').value = parseInt(document.getElementById('data').value) + 1" name = "increase"/>

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Игорь_Vasinsky, jquery надо

$(function() {

    $("input[name=increase]").click(function(){

        var $id = $("input[name=id]");
        $id.val(parseInt($id.val()) + 1)
    });
});

ну надо так надо

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HTML, CSS (Bootstrap), JS(JQuery, ExtJS), PHP, MySQL, MSSql, Posgres, (TSql, BI OLAP, MDX), Mongo, Git, SVN, CodeIgnater, Symfony, Yii 2, JiRA, Redmine, Bitbucket, Composer, Rabbit MQ, Amazon (SQS, S3, Transcribe), Docker