问jQuery转义特殊字符

EN

 <script src="http://code.jquery.com/jquery.js"></script>

 <input type="submit" name="replace" id="replace" value="Replace" />

 <div class="my_div">Default1 content1</div>
 <div class="my_div">Default2 content2</div>

$('#replace').click(function() {
    $('.my_div').text(function( idx, oldHtml){
        return oldHtml
            .replace("Default1", 'α')
            .replace("Default2", 'β')
            .replace("content1", '∑');
    });
});