How to get text from the title attribute when <th> is clicked?

If I have the following HTML:

<th title="Title Description">Blah</th>

How do I select text from the title attribute when I click on 开发者_开发问答<th>?

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$(function() {
    $('th').click(function() {
        var title = $(this).attr('title');
    });
});

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$(function () {
    $('th').click(function () {
        var title = $(this).attr('title');
        // do something useful with title
    });
});

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Try this

$(document).ready(function() {
        $('th').click(function() {
           var title = $(this).attr('title');
           alert(title);
      });
    });

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$('th').click(function(){alert($(this).attr('title'));});

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$('tr').click(function() {
    var title = $(this).children('th').attr('title');
});