WebGL获取在数组中获取离目标点最近的点

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findNearPoint(centerPoint,pointArr){
   let minLen=99999999;
   let nearP=centerPoint;
   pointArr.forEach((point,index)=>{
       let dic = Cesium.Cartesian3.distance(
           new Cesium.Cartesian3(centerPoint[0], centerPoint[1], 0), 
           new Cesium.Cartesian3(point[0], point[1], 0)
       );
       if(dic<minLen){
           minLen=dic;
           nearP=point;
       }
   });
   return nearP;
},