<div id="tag"></div>

        <div id="tag1"></div>

        <div id="tag2"></div>

        <script type="text/javascript">

            var a = {};

            a.id = "id1";

            a.name = "名称";

            var str = '';

            var str1 = '';

            str = str+'<div class='+a.id+'>测试</div>';

            str1 = str1+'<div class=\"'+a.id+'\">测试</div>';

            str2 = str2+'<div class=\''+a.id+'\'>测试</div>';

            $("#tag").html(str);

            $("#tag1").html(str1);

            $("#tag2").html(str2);

        </script>