通过腾讯地图api获取用户位置限制在指定位置区域

<!--在微信中获取用户位置-->
<script src="http://res.wx.qq.com/open/js/jweixin-1.0.0.js"></script>
    <script charset="utf-8" src="http://map.qq.com/api/js?v=2.exp&key=3FVBZ-FZ2KW-E7CR4-ROZRS-B7TNQ-C7BSI"></script>
    <script type="text/javascript">
        var map;
        var markerE;
        var wd = "", jd = "", fw = "", address = "", isCompany = ;
        var init = function () {
            map = new qq.maps.Map(document.getElementById("container"), {
                center: new qq.maps.LatLng(30.602239286171868, 114.51272616386414),
                zoom:
            });
            var polygon = new qq.maps.Polygon({
                map: map,
                path: path,
                strokeColor: new qq.maps.Color(, , , 0.5),
                fillColor: qq.maps.Color.fromHex("#000000", 0.5)
            });
        }
        var path = [
        new qq.maps.LatLng(30.602165333622294, 114.51280663013458),
        new qq.maps.LatLng(30.601347229791023, 114.51272616386414),
        new qq.maps.LatLng(30.601236299928177, 114.51398680210114),
        new qq.maps.LatLng(30.60208213693682, 114.51407799720764)
        ];
        function isInsidePolygon(pt, poly) {
            for (var c = false, i = -, l = poly.length, j = l - ; ++i < l; j = i)
                ((poly[i].lat <= pt.lat && pt.lat < poly[j].lat) || (poly[j].lat <= pt.lat && pt.lat < poly[i].lat)) &&
                (pt.lng < (poly[j].lng - poly[i].lng) * (pt.lat - poly[i].lat) / (poly[j].lat - poly[i].lat) + poly[i].lng) &&
                (c = !c);
            return c;
        }
        var dksubmit = function () {
            $('#dialog1').hide();
            if (address == "") {
                $("#dialog2").show().find("#msg").text("未获取到地址，请先定位");
            } else {
                $.post("url", { wd: wd, jd: jd, fw: fw, add: address, isCompany: isCompany }, function (res) {
                    if (res == "true") {
                        $("#dialog2").show().find("#msg").text("在规定位置");
                    } else {
                        $("#dialog2").show().find("#msg").text(res);
                    }
                });
            }
        }
        $(document).ready(function () {
            $(".weui_loading_toast").show();
            wx.ready(function () {
                $(".dw").click();
            });
            wx.error(function (res) {
                var msg = "";
                for (var i in res) {
                    msg += i + ":" + res[i] + "|";
                }
                alert("ERROR:" + msg);
            });
            wx.config(@(new HtmlString(ViewBag.sign)));
            init();
            $(".dw").click(function () {
                wx.getLocation({
                    type: 'gcj02', // 默认为wgs84的gps坐标，如果要返回直接给openLocation用的火星坐标，可传入'gcj02'
                    success: function (res) {
                        var loc = new qq.maps.LatLng(res.latitude, res.longitude);
                        map.setCenter(loc);
                        if (markerE) {
                            markerE.setPosition(loc);
                        } else {
                            markerE = new qq.maps.Marker({
                                position: loc,
                                map: map
                            });
                        }
                        $("#zb").text(res.latitude + "," + res.longitude);
                        var geocoder = new qq.maps.Geocoder({
                            complete: function (result) {
                                $("#dz").text(result.detail.address);
                                address = result.detail.address;
                            }
                        });
                        var coord = new qq.maps.LatLng(res.latitude, res.longitude);
                        geocoder.getAddress(coord);
                        wd = res.latitude;
                        jd = res.longitude;
                        if (res.accuracy != undefined) {
                            fw = res.accuracy;
                        } else {
                            fw = ;
                        }
                        if (isInsidePolygon(loc, path)) {
                            $("#yx").text("有效位置");
                            isCompany = ;
                        }
                        else {
                            isCompany = ;
                            $("#yx").text("无效位置");
                        }

                        $(".weui_loading_toast").hide();
                    }
                });
            });

        });
    </script>