html页面中的php代码中如何调用js变量

<script type="text/javascript">
var first=$(‘#first option:selected‘).val();
$.ajax({
            url: ‘{{ path_for(showDetail_item) }}‘,
            dataType: ‘json‘,
            data: {pid:position},
            type: "GET",
            success: function (msg) {
                var url=‘{{ path_for(‘zyposition.modify‘, {‘id‘:‘pos_id‘,‘method‘:‘changPos‘}) }}‘;
                url=url.replace(‘pos_id‘,first);
                $(‘#change‘).append("<a  href=‘javascript:;‘ onclick=\"javascript:loadPage(‘"+url+"‘);\"><button type=‘button‘ class=‘btn btn-primary‘ title=‘修改‘><strong>修改</strong></button></a>");              
            }
        });
    };
</script>