1、js实现，以polygon为例wkt转geojson

function processPolygonString2PolygonArray(polygonString, proj) {var geoJson = {};if (polygonString.startsWith("MULTIPOLYGON")) {// 多面geoJson["type"] = "MultiPolygon";var firstLeftIndex = polygonString.indexOf('(');var lastRightIndex = polygonString.indexOf(')');// 去掉首尾括号    var str = polygonString.substring(firstLeftIndex + 1, polygonString.length - 1); //   ((),(),()) , ((),(),()) , ((),(),())// console.log(str);var pArray = new Array();var polygonArray = str.split(")),((");for (var i = 0; i < polygonArray.length; i++) {var pStr = polygonArray[i];//每个polygon的Stringif (polygonArray.length === 1) {//如果只有1个，说明没有被分割// 去掉第一个(  去掉结尾)pStr = pStr.substring(1, pStr.length - 1);} else if (i === 0) {// 第一个，去第一个(   补结尾加上 )pStr = pStr.substring(1, pStr.length) + ")"; //  (),(),()   环的集合}else if (i === polygonArray.length - 1) {// 最后一个: 补第一个( ， 去 最后一个)pStr = "(" + pStr.substring(0, pStr.length - 1);} else {// 中间，补第一个(   补最后一个 )pStr = "(" + pStr + ")";}// pStr 表示  () , () ,()   线环集合// 分割环var rArray = new Array();var ringsArray = pStr.split("),(");for (var j = 0; j < ringsArray.length; j++) {var ringStr = ringsArray[j];if (ringsArray.length === 1) {// 去掉第一个(   去掉结尾  )ringStr = ringStr.substring(1, ringStr.length - 1);} else if (j === 0) {                    // 如果是第一个// 去掉第一个(ringStr = ringStr.substring(1, ringStr.length);} else if (j === ringsArray.length - 1) {// 最后一个 // 去掉结尾 )ringStr = ringStr.substring(0, ringStr.length - 1);}// 再按逗号分割就是点集合var ptsArray = new Array();var pointArr = ringStr.split(",");for (var k = 0; k < pointArr.length; k++) {var pt_arr = pointArr[k].split(" ");var proj_arr = proj4(proj).inverse([pt_arr[0], pt_arr[1]]);ptsArray.push(proj_arr);}rArray.push(ptsArray);}pArray.push(rArray);}//console.log(JSON.stringify(pArray));geoJson["coordinates"] = pArray;} else if (polygonString.startsWith("POLYGON")) {// 面，其中有可能有环geoJson["type"] = "Polygon";var firstLeftIndex = polygonString.indexOf('(');var lastRightIndex = polygonString.indexOf(')');// 去掉首尾括号    var str = polygonString.substring(firstLeftIndex + 1, polygonString.length - 1); //   (),(),() var rArray = new Array();var ringsArray = str.split("),(");for (var j = 0; j < ringsArray.length; j++) {var ringStr = ringsArray[j];if (ringsArray.length === 1) {// 去掉第一个(   去掉结尾  )ringStr = ringStr.substring(1, ringStr.length - 1);} else if (j === 0) {                    // 如果是第一个// 去掉第一个(ringStr = ringStr.substring(1, ringStr.length);} else if (j === ringsArray.length - 1) {// 最后一个 // 去掉结尾 )ringStr = ringStr.substring(0, ringStr.length - 1);}// 再按逗号分割就是点集合var ptsArray = new Array();var pointArr = ringStr.split(",");for (var k = 0; k < pointArr.length; k++) {var pt_arr = pointArr[k].split(" ");var proj_arr = proj4(proj).inverse([pt_arr[0], pt_arr[1]]);ptsArray.push(proj_arr);}rArray.push(ptsArray);}geoJson["coordinates"] = rArray;}return geoJson;
}

2、npm实现

npm install terraformer - wkt - parserimport wkt from 'wkt'var wkt = require('terraformer-wkt-parser');// parse a WKT file, convert it into a terraformer primitive
var primitive = wkt.parse('LINESTRING (30 10, 10 30, 40 40)');// take a terraformer primitive and convert it into a WKT representation
var polygon = wkt.stringify({"type": "Polygon","coordinates": [[[100.0, 0.0], [101.0, 0.0], [101.0, 1.0], [100.0, 1.0], [100.0, 0.0]],[[100.2, 0.2], [100.8, 0.2], [100.8, 0.8], [100.2, 0.8], [100.2, 0.2]]]}
);