Ajax嵌套调用 （jquery） $.ajaxSettings.async = false;

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title></title>
    <script src="../javascripts/jquery-2.1.4.js"></script>
    <script>
        window.onload = function () {
            $.post("Handler.ashx", { flag:  }, function (_data) {
                if (_data) {
                    var html = "";
                    html += "<table border='1'>";
                    for (var i = ; i < _data.length; i++) {
                        var pj00401 = _data[i].pj00401;
                        html += "<tr>";
                        html += "<td>" + _data[i].pj00402 + "</td>";
                        html += "<td>" + getHtml(pj00401) + "</td>";
                        html += "</tr>";
                    }
                    html += "</table>";
                    $("#div1").append(html);
                }

            }, "json");  

            var getHtml = function (_pj00401) {
                var _html = "";
                $.ajaxSettings.async = false;//重要设置
                $.get("Handler.ashx", { flag: , pj00401: _pj00401 }, function (_data) {
                    if (_data) {
                        _html = "<table>";
                        _html += "<tbody> ";
                        for (var i = ; i < _data.length; i++) {
                            _html += "<tr>";
                            _html += "<td>" + _data[i].pj00402 + "</td>";
                            _html += "</tr>";
                        }
                        _html += "</tbody>";
                        _html += "</table>";
                    }
                }, "json");
                return _html;
            }

        }
    </script>
</head>
<body>

    <div id="div1"></div>

</body>
</html>