以下语言为js，所取的坐标以百度地图为准，所以需引用百度api，其它的坐标请转换后在判断即可。
1：创建中国地图边界线数组
function CreateChinaMapLine() { var pts = []; pt1 = new BMap.Point(124.326919, 39.841287); pts.push(pt1); pt2 = new BMap.Point(124.630475, 40.230192); pts.push(pt2); pt3 = new BMap.Point(124.980023, 40.420289); pts.push(pt3); pt4 = new BMap.Point(125.053612, 40.458947); pts.push(pt4); pt5 = new BMap.Point(125.028316, 40.520401); pts.push(pt5); pt6 = new BMap.Point(125.331871, 40.63438); pts.push(pt6); pt7 = new BMap.Point(125.456053, 40.61861); pts.push(pt7); pt8 = new BMap.Point(126.042467, 40.901897); pts.push(pt8); pt9 = new BMap.Point(126.888743, 41.73411); pts.push(pt9); pt10 = new BMap.Point(127.367072, 41.437131); pts.push(pt10); pt11 = new BMap.Point(128.148958, 41.347076); pts.push(pt11); pt12 = new BMap.Point(128.323732, 41.568524); pts.push(pt12); pt13 = new BMap.Point(128.112163, 41.961089); pts.push(pt13); pt14 = new BMap.Point(128.995233, 41.99541); pts.push(pt14); pt15 = new BMap.Point(129.418371, 42.378521); pts.push(pt15); pt16 = new BMap.Point(129.841509, 42.41943); pts.push(pt16); pt17 = new BMap.Point(130.080674, 42.90824); pts.push(pt17); pt18 = new BMap.Point(130.65099, 42.364879); pts.push(pt18); pt19 = new BMap.Point(130.503812, 42.637157); pts.push(pt19); pt20 = new BMap.Point(131.147717, 42.867653); pts.push(pt20); pt21 = new BMap.Point(131.313293, 43.366337); pts.push(pt21); pt22 = new BMap.Point(131.386882, 43.967324); pts.push(pt22); pt23 = new BMap.Point(131.202909, 44.798523); pts.push(pt23); pt24 = new BMap.Point(131.938801, 45.190155); pts.push(pt24); pt25 = new BMap.Point(133.024241, 44.916296); pts.push(pt25); pt26 = new BMap.Point(134.385641, 47.183241); pts.push(pt26); pt27 = new BMap.Point(134.845574, 47.670159); pts.push(pt27); pt28 = new BMap.Point(134.73519, 48.066299); pts.push(pt28); pt29 = new BMap.Point(135.250314, 48.434915); pts.push(pt29); pt30 = new BMap.Point(133.079433, 48.115602); pts.push(pt30); pt31 = new BMap.Point(132.453925, 47.76948); pts.push(pt31); pt32 = new BMap.Point(131.221306, 47.707427); pts.push(pt32); pt33 = new BMap.Point(130.85336, 48.078629); pts.push(pt33); pt34 = new BMap.Point(130.908552, 48.825163); pts.push(pt34); pt35 = new BMap.Point(128.093766, 49.632427); pts.push(pt35); pt36 = new BMap.Point(125.830898, 53.063643); pts.push(pt36); pt37 = new BMap.Point(123.420852, 53.60326); pts.push(pt37); pt38 = new BMap.Point(120.661258, 53.240599); pts.push(pt38); pt39 = new BMap.Point(119.906969, 52.584436); pts.push(pt39); pt40 = new BMap.Point(120.698052, 52.494695); pts.push(pt40); pt41 = new BMap.Point(120.734847, 52.05456); pts.push(pt41); pt42 = new BMap.Point(119.023898, 50.296998); pts.push(pt42); pt43 = new BMap.Point(119.263063, 50.143545); pts.push(pt43); pt44 = new BMap.Point(117.956855, 49.560675); pts.push(pt44); pt45 = new BMap.Point(116.889812, 49.858941); pts.push(pt45); pt46 = new BMap.Point(115.47322, 48.078629); pts.push(pt46); pt47 = new BMap.Point(115.988344, 47.607987); pts.push(pt47); pt48 = new BMap.Point(116.797825, 47.76948); pts.push(pt48); pt49 = new BMap.Point(117.349744, 47.520821); pts.push(pt49); pt50 = new BMap.Point(117.901663, 47.905734); pts.push(pt50); pt51 = new BMap.Point(118.508774, 47.893363); pts.push(pt51); pt52 = new BMap.Point(118.545569, 47.86861); pts.push(pt52); pt53 = new BMap.Point(119.888571, 46.843488); pts.push(pt53); pt54 = new BMap.Point(119.796585, 46.590415); pts.push(pt54); pt55 = new BMap.Point(119.005501, 46.717101); pts.push(pt55); pt56 = new BMap.Point(117.791279, 46.526961); pts.push(pt56); pt57 = new BMap.Point(117.404936, 46.310656); pts.push(pt57); pt58 = new BMap.Point(116.797825, 46.323404); pts.push(pt58); pt59 = new BMap.Point(116.282701, 45.798295); pts.push(pt59); pt60 = new BMap.Point(114.700534, 45.384961); pts.push(pt60); pt61 = new BMap.Point(113.670285, 44.759212); pts.push(pt61); pt62 = new BMap.Point(112.161707, 45.04687); pts.push(pt62); pt63 = new BMap.Point(111.444212, 44.298587); pts.push(pt63); pt64 = new BMap.Point(111.959336, 43.767669); pts.push(pt64); pt65 = new BMap.Point(110.082812, 42.569199); pts.push(pt65); pt66 = new BMap.Point(107.543985, 42.39216); pts.push(pt66); pt67 = new BMap.Point(105.115542, 41.609961); pts.push(pt67); pt68 = new BMap.Point(100.405834, 42.596391); pts.push(pt68); pt69 = new BMap.Point(96.560799, 42.772848); pts.push(pt69); pt70 = new BMap.Point(91.188788, 45.203163); pts.push(pt70); pt71 = new BMap.Point(89.992964, 47.893363); pts.push(pt71); pt72 = new BMap.Point(87.969261, 49.115857); pts.push(pt72); pt73 = new BMap.Point(86.847026, 49.055436); pts.push(pt73); pt74 = new BMap.Point(85.724791, 48.201769); pts.push(pt74); pt75 = new BMap.Point(85.301653, 47.05766); pts.push(pt75); pt76 = new BMap.Point(83.167567, 47.23339); pts.push(pt76); pt77 = new BMap.Point(82.284497, 45.52739); pts.push(pt77); pt78 = new BMap.Point(82.652442, 45.177144); pts.push(pt78); pt79 = new BMap.Point(81.769372, 45.346053); pts.push(pt79); pt80 = new BMap.Point(79.911245, 44.890145); pts.push(pt80); pt81 = new BMap.Point(80.702329, 43.20505); pts.push(pt81); pt82 = new BMap.Point(80.003232, 42.077702); pts.push(pt82); pt83 = new BMap.Point(77.096459, 41.05527); pts.push(pt83); pt84 = new BMap.Point(76.158197, 40.369298); pts.push(pt84); pt85 = new BMap.Point(75.753456, 40.594072); pts.push(pt85); pt86 = new BMap.Point(74.925578, 40.48178); pts.push(pt86); pt87 = new BMap.Point(73.803343, 39.605094); pts.push(pt87); pt88 = new BMap.Point(73.637767, 39.291284); pts.push(pt88); pt89 = new BMap.Point(73.913726, 38.457149); pts.push(pt89); pt90 = new BMap.Point(74.612824, 38.500536); pts.push(pt90); pt91 = new BMap.Point(74.999167, 37.31988); pts.push(pt91); pt92 = new BMap.Point(77.924337, 35.325072); pts.push(pt92); pt93 = new BMap.Point(78.273886, 34.598061); pts.push(pt93); pt94 = new BMap.Point(79.101764, 34.293224); pts.push(pt94); pt95 = new BMap.Point(78.770613, 33.987267); pts.push(pt95); pt96 = new BMap.Point(79.230545, 32.472038); pts.push(pt96); pt97 = new BMap.Point(78.880997, 32.59672); pts.push(pt97); pt98 = new BMap.Point(78.421064, 32.425237); pts.push(pt98); pt99 = new BMap.Point(78.844202, 31.18404); pts.push(pt99); pt100 = new BMap.Point(81.180659, 29.990271); pts.push(pt100); pt101 = new BMap.Point(81.71418, 30.34198); pts.push(pt101); pt102 = new BMap.Point(86.092737, 27.935542); pts.push(pt102); pt103 = new BMap.Point(88.760345, 27.951881); pts.push(pt103); pt104 = new BMap.Point(88.99951, 27.197728); pts.push(pt104); pt105 = new BMap.Point(89.845786, 28.098817); pts.push(pt105); pt106 = new BMap.Point(91.538337, 27.772017); pts.push(pt106); pt107 = new BMap.Point(92.108653, 26.769165); pts.push(pt107); pt108 = new BMap.Point(93.893191, 26.851709); pts.push(pt108); pt109 = new BMap.Point(95.916893, 28.115131); pts.push(pt109); pt110 = new BMap.Point(97.223102, 27.690161); pts.push(pt110); pt111 = new BMap.Point(97.609445, 28.375809); pts.push(pt111); pt112 = new BMap.Point(98.363734, 27.427807); pts.push(pt112); pt113 = new BMap.Point(98.73168, 26.653501); pts.push(pt113); pt114 = new BMap.Point(97.646239, 24.702995); pts.push(pt114); pt115 = new BMap.Point(97.627842, 23.842845); pts.push(pt115); pt116 = new BMap.Point(98.658091, 23.944344); pts.push(pt116); pt117 = new BMap.Point(98.970845, 23.045009); pts.push(pt117); pt118 = new BMap.Point(99.449174, 22.89168); pts.push(pt118); pt119 = new BMap.Point(99.21001, 21.96805); pts.push(pt119); pt120 = new BMap.Point(99.982696, 21.933723); pts.push(pt120); pt121 = new BMap.Point(100.166669, 21.366121); pts.push(pt121); pt122 = new BMap.Point(101.086534, 21.589991); pts.push(pt122); pt123 = new BMap.Point(101.730439, 21.055576); pts.push(pt123); pt124 = new BMap.Point(101.969604, 21.31441); pts.push(pt124); pt125 = new BMap.Point(101.804028, 22.190972); pts.push(pt125); pt126 = new BMap.Point(102.53992, 22.53323); pts.push(pt126); pt127 = new BMap.Point(103.956512, 22.447745); pts.push(pt127); pt128 = new BMap.Point(105.465091, 23.130116); pts.push(pt128); pt129 = new BMap.Point(107.819945, 21.435041); pts.push(pt129); pt130 = new BMap.Point(108.408658, 20.588528); pts.push(pt130); pt131 = new BMap.Point(108.243082, 17.791978); pts.push(pt131); pt132 = new BMap.Point(110.101209, 14.556493); pts.push(pt132); pt133 = new BMap.Point(109.82525, 10.162358); pts.push(pt133); pt134 = new BMap.Point(108.151096, 6.074665); pts.push(pt134); pt135 = new BMap.Point(109.604482, 3.416913); pts.push(pt135); pt136 = new BMap.Point(113.136763, 3.712694); pts.push(pt136); pt137 = new BMap.Point(115.362836, 6.737258); pts.push(pt137); pt138 = new BMap.Point(117.404936, 9.505473); pts.push(pt138); pt139 = new BMap.Point(119.318255, 14.574413); pts.push(pt139); pt140 = new BMap.Point(120.164531, 19.12633); pts.push(pt140); pt141 = new BMap.Point(122.059452, 21.693198); pts.push(pt141); pt142 = new BMap.Point(122.813741, 24.686186); pts.push(pt142); pt143 = new BMap.Point(124.230333, 28.457139); pts.push(pt143); pt144 = new BMap.Point(124.855841, 32.721228); pts.push(pt144); pt145 = new BMap.Point(124.230333, 36.56674); pts.push(pt145); pt146 = new BMap.Point(124.487895, 39.59086); pts.push(pt146); return pts; }
2：添加以下js百度地图辅助类
//此js用于辅助百度地图操作，主要判断坐标位置是否在某个圆、矩形之内还是之外 var BMapLib = window.BMapLib = BMapLib || {}; (function () { var a = 6370996.81; var b = BMapLib.GeoUtils = function () { }; b.isPointInRect = function (f, g) { if (!(f instanceof BMap.Point) || !(g instanceof BMap.Bounds)) { return false } var e = g.getSouthWest(); var h = g.getNorthEast(); return (f.lng >= e.lng && f.lng <= h.lng && f.lat >= e.lat && f.lat <= h.lat) }; b.isPointInCircle = function (e, h) { if (!(e instanceof BMap.Point) || !(h instanceof BMap.Circle)) { return false } var i = h.getCenter(); var g = h.getRadius(); var f = b.getDistance(e, i); if (f <= g) { return true } else { return false } }; b.isPointOnPolyline = function (f, h) { if (!(f instanceof BMap.Point) || !(h instanceof BMap.Polyline)) { return false } var e = h.getBounds(); if (!this.isPointInRect(f, e)) { return false } var m = h.getPath(); for (var k = 0; k < m.length - 1; k++) { var l = m[k]; var j = m[k + 1]; if (f.lng >= Math.min(l.lng, j.lng) && f.lng <= Math.max(l.lng, j.lng) && f.lat >= Math.min(l.lat, j.lat) && f.lat <= Math.max(l.lat, j.lat)) { var g = (l.lng - f.lng) * (j.lat - f.lat) - (j.lng - f.lng) * (l.lat - f.lat); if (g < 2e-10 && g > -2e-10) { return true } } } return false }; b.isPointInPolygon = function (o, l) { if (!(o instanceof BMap.Point) || !(l instanceof BMap.Polygon)) { return false } var k = l.getBounds(); if (!this.isPointInRect(o, k)) { return false } var t = l.getPath(); var h = t.length; var n = true; var j = 0; var g = 2e-10; var s, q; var e = o; s = t[0]; for (var f = 1; f <= h; ++f) { if (e.equals(s)) { return n } q = t[f % h]; if (e.lat < Math.min(s.lat, q.lat) || e.lat > Math.max(s.lat, q.lat)) { s = q; continue } if (e.lat > Math.min(s.lat, q.lat) && e.lat < Math.max(s.lat, q.lat)) { if (e.lng <= Math.max(s.lng, q.lng)) { if (s.lat == q.lat && e.lng >= Math.min(s.lng, q.lng)) { return n } if (s.lng == q.lng) { if (s.lng == e.lng) { return n } else { ++j } } else { var r = (e.lat - s.lat) * (q.lng - s.lng) / (q.lat - s.lat) + s.lng; if (Math.abs(e.lng - r) < g) { return n } if (e.lng < r) { ++j } } } } else { if (e.lat == q.lat && e.lng <= q.lng) { var m = t[(f + 1) % h]; if (e.lat >= Math.min(s.lat, m.lat) && e.lat <= Math.max(s.lat, m.lat)) { ++j } else { j += 2 } } } s = q } if (j % 2 == 0) { return false } else { return true } }; b.degreeToRad = function (e) { return Math.PI * e / 180 }; b.radToDegree = function (e) { return (180 * e) / Math.PI }; function d(g, f, e) { if (f != null) { g = Math.max(g, f) } if (e != null) { g = Math.min(g, e) } return g } function c(g, f, e) { while (g > e) { g -= e - f } while (g < f) { g += e - f } return g } b.getDistance = function (j, h) { if (!(j instanceof BMap.Point) || !(h instanceof BMap.Point)) { return 0 } j.lng = c(j.lng, -180, 180); j.lat = d(j.lat, -74, 74); h.lng = c(h.lng, -180, 180); h.lat = d(h.lat, -74, 74); var f, e, i, g; f = b.degreeToRad(j.lng); i = b.degreeToRad(j.lat); e = b.degreeToRad(h.lng); g = b.degreeToRad(h.lat); return a * Math.acos((Math.sin(i) * Math.sin(g) + Math.cos(i) * Math.cos(g) * Math.cos(e - f))) }; b.getPolylineDistance = function (f) { if (f instanceof BMap.Polyline || f instanceof Array) { var l; if (f instanceof BMap.Polyline) { l = f.getPath() } else { l = f } if (l.length < 2) { return 0 } var j = 0; for (var h = 0; h < l.length - 1; h++) { var k = l[h]; var g = l[h + 1]; var e = b.getDistance(k, g); j += e } return j } else { return 0 } }; b.getPolygonArea = function (t) { if (!(t instanceof BMap.Polygon) && !(t instanceof Array)) { return 0 } var R; if (t instanceof BMap.Polygon) { R = t.getPath() } else { R = t } if (R.length < 3) { return 0 } var w = 0; var D = 0; var C = 0; var L = 0; var J = 0; var F = 0; var E = 0; var S = 0; var H = 0; var p = 0; var T = 0; var I = 0; var q = 0; var e = 0; var M = 0; var v = 0; var K = 0; var N = 0; var s = 0; var O = 0; var l = 0; var g = 0; var z = 0; var Q = 0; var G = 0; var j = 0; var A = 0; var o = 0; var m = 0; var y = 0; var x = 0; var h = 0; var k = 0; var f = 0; var n = a; var B = R.length; for (var P = 0; P < B; P++) { if (P == 0) { D = R[B - 1].lng * Math.PI / 180; C = R[B - 1].lat * Math.PI / 180; L = R[0].lng * Math.PI / 180; J = R[0].lat * Math.PI / 180; F = R[1].lng * Math.PI / 180; E = R[1].lat * Math.PI / 180 } else { if (P == B - 1) { D = R[B - 2].lng * Math.PI / 180; C = R[B - 2].lat * Math.PI / 180; L = R[B - 1].lng * Math.PI / 180; J = R[B - 1].lat * Math.PI / 180; F = R[0].lng * Math.PI / 180; E = R[0].lat * Math.PI / 180 } else { D = R[P - 1].lng * Math.PI / 180; C = R[P - 1].lat * Math.PI / 180; L = R[P].lng * Math.PI / 180; J = R[P].lat * Math.PI / 180; F = R[P + 1].lng * Math.PI / 180; E = R[P + 1].lat * Math.PI / 180 } } S = Math.cos(J) * Math.cos(L); H = Math.cos(J) * Math.sin(L); p = Math.sin(J); T = Math.cos(C) * Math.cos(D); I = Math.cos(C) * Math.sin(D); q = Math.sin(C); e = Math.cos(E) * Math.cos(F); M = Math.cos(E) * Math.sin(F); v = Math.sin(E); K = (S * S + H * H + p * p) / (S * T + H * I + p * q); N = (S * S + H * H + p * p) / (S * e + H * M + p * v); s = K * T - S; O = K * I - H; l = K * q - p; g = N * e - S; z = N * M - H; Q = N * v - p; m = (g * s + z * O + Q * l) / (Math.sqrt(g * g + z * z + Q * Q) * Math.sqrt(s * s + O * O + l * l)); m = Math.acos(m); G = z * l - Q * O; j = 0 - (g * l - Q * s); A = g * O - z * s; if (S != 0) { o = G / S } else { if (H != 0) { o = j / H } else { o = A / p } } if (o > 0) { y += m; k++ } else { x += m; h++ } } var u, r; u = y + (2 * Math.PI * h - x); r = (2 * Math.PI * k - y) + x; if (y > x) { if ((u - (B - 2) * Math.PI) < 1) { f = u } else { f = r } } else { if ((r - (B - 2) * Math.PI) < 1) { f = r } else { f = u } } w = (f - (B - 2) * Math.PI) * n * n; return w } })();
3：调用方法判断是否在中国境内
//判断点在多边形内还是外 function ptInPolygon(lng, lat) { var pts=CreateChinaMapLine(); var ply = new BMap.Polygon(pts); var pt = new BMap.Point(lng, lat); var result = BMapLib.GeoUtils.isPointInPolygon(pt, ply); if (result == true) { alert("点在中国内"); } else { alert("点在中国外") } }
4：扩展其它
//点在矩形内 function ptInRect() { var pt = new BMap.Point(116.404, 39.915);//测试点 var pt1 = new BMap.Point(116.400, 39.910);//西南脚点 var pt2 = new BMap.Point(116.410, 39.920);//东北脚点 var bds = new BMap.Bounds(pt1, pt2); //测试Bounds对象 var result = BMapLib.GeoUtils.isPointInRect(pt, bds); if (result == true) { alert("点在矩形内"); } else { alert("点在矩形外") } //演示：将点与矩形添加到地图上 map.clearOverlays(); var mkr = new BMap.Marker(pt); var pts = []; //bds的四个脚点坐标 var leftTop = new BMap.Point(pt1.lng, pt2.lat); var rightTop = new BMap.Point(pt2.lng, pt2.lat); var leftBottom = new BMap.Point(pt1.lng, pt1.lat); var rightBottom = new BMap.Point(pt2.lng, pt1.lat); pts.push(leftTop); pts.push(rightTop); pts.push(rightBottom); pts.push(leftBottom); var rect = new BMap.Polygon(pts); map.addOverlay(mkr);//添加测试点 map.addOverlay(rect);//添加测试矩形 } //点在圆内 function ptInCircle() { var pt = new BMap.Point(116.404, 39.915);//测试点 var c = new BMap.Point(116.404, 39.915); //圆心 var circle = new BMap.Circle(c, 500);//测试圆 var result = BMapLib.GeoUtils.isPointInCircle(pt, circle); if (result == true) { alert("点在圆形内"); } else { alert("点在圆形外") } //演示：将点与圆形添加到地图上 map.clearOverlays(); var mkr = new BMap.Marker(pt); map.addOverlay(mkr); map.addOverlay(circle); } //计算长度，参数为折线 function computeLenByPolyine() { var pts = []; var pt1 = new BMap.Point(116.400, 39.910); var pt2 = new BMap.Point(116.402, 39.912); var pt3 = new BMap.Point(116.403, 39.914); var pt4 = new BMap.Point(116.404, 39.917); var pt5 = new BMap.Point(116.406, 39.918); pts.push(pt1); pts.push(pt2); pts.push(pt3); pts.push(pt4); pts.push(pt5); var ply = new BMap.Polyline(pts); var dis = BMapLib.GeoUtils.getPolylineDistance(ply); alert("共" + dis.toFixed(2) + "米"); //演示：将线添加到地图上 map.clearOverlays(); map.addOverlay(ply); } //计算长度，参数为点数组 function computeLenByArray() { var pts = []; var pt1 = new BMap.Point(116.400, 39.910); var pt2 = new BMap.Point(116.402, 39.912); var pt3 = new BMap.Point(116.403, 39.914); var pt4 = new BMap.Point(116.404, 39.917); var pt5 = new BMap.Point(116.406, 39.918); pts.push(pt1); pts.push(pt2); pts.push(pt3); pts.push(pt4); pts.push(pt5); var dis = BMapLib.GeoUtils.getPolylineDistance(pts); alert("共" + dis.toFixed(2) + "米"); //演示：将线添加到地图上 var ply = new BMap.Polyline(pts, { strokeColor: "red", strokeStyle: "dashed" }); map.clearOverlays(); map.addOverlay(ply); } //计算面积，参数为多边形 function computeAreaByPolygon() { var pts = []; var pt1 = new BMap.Point(116.395, 39.910); var pt2 = new BMap.Point(116.394, 39.918); var pt3 = new BMap.Point(116.396, 39.919); var pt4 = new BMap.Point(116.404, 39.920); var pt5 = new BMap.Point(116.406, 39.913); pts.push(pt1); pts.push(pt2); pts.push(pt3); pts.push(pt4); pts.push(pt5); var ply = new BMap.Polygon(pts); var area = BMapLib.GeoUtils.getPolygonArea(ply); alert("共" + area.toFixed(2) + "平方米"); //演示：将面添加到地图上 map.clearOverlays(); map.addOverlay(ply); } //计算面积，参数为数组 function computeAreaByArray() { var pts = []; var pt1 = new BMap.Point(116.395, 39.910); var pt2 = new BMap.Point(116.394, 39.918); var pt3 = new BMap.Point(116.396, 39.919); var pt4 = new BMap.Point(116.404, 39.920); var pt5 = new BMap.Point(116.406, 39.913); pts.push(pt1); pts.push(pt2); pts.push(pt3); pts.push(pt4); pts.push(pt5); var area = BMapLib.GeoUtils.getPolygonArea(pts); alert("共" + area.toFixed(2) + "平方米"); //演示：将面添加到地图上 var ply = new BMap.Polygon(pts, { strokeColor: "red", strokeStyle: "dashed", fillColor: "gray" }); map.clearOverlays(); map.addOverlay(ply); } //点在折线上 function ptOnPolyline() { var pts = []; var pt1 = new BMap.Point(116.395, 39.910); var pt2 = new BMap.Point(116.405, 39.920); var pt3 = new BMap.Point(116.410, 39.920); pts.push(pt1); pts.push(pt2); pts.push(pt3); var ply = new BMap.Polyline(pts); var pt = new BMap.Point(116.400, 39.915); var result = BMapLib.GeoUtils.isPointOnPolyline(pt, ply); if (result == true) { alert("点在折线上"); } else { alert("点在折线外") } map.clearOverlays(); var mkr = new BMap.Marker(pt); map.addOverlay(mkr); map.addOverlay(ply); }