SOURCE

var obj ={
"type": "FeatureCollection",
"name": "02点位",
"crs": { "type": "name", "properties": { "name": "urn:ogc:def:crs:OGC:1.3:CRS84" } },
"features": [
{ "type": "Feature", "properties": { }, "geometry": { "type": "Point", "coordinates": [ 120.82632254, 30.02451582 ] } },
{ "type": "Feature", "properties": { }, "geometry": { "type": "Point", "coordinates": [ 120.84263353, 30.0270744 ] } },
{ "type": "Feature", "properties": { }, "geometry": { "type": "Point", "coordinates": [ 120.838156, 30.00148854 ] } },
{ "type": "Feature", "properties": { }, "geometry": { "type": "Point", "coordinates": [ 120.81320979, 30.0050066 ] } },
{ "type": "Feature", "properties": { }, "geometry": { "type": "Point", "coordinates": [ 120.88612949, 30.02611493 ] } },
{ "type": "Feature", "properties": { }, "geometry": { "type": "Point", "coordinates": [ 120.89348543, 30.03698893 ] } },
{ "type": "Feature", "properties": { }, "geometry": { "type": "Point", "coordinates": [ 120.89220613, 30.05809726 ] } },
{ "type": "Feature", "properties": { }, "geometry": { "type": "Point", "coordinates": [ 120.87909338, 30.07760648 ] } },
{ "type": "Feature", "properties": { }, "geometry": { "type": "Point", "coordinates": [ 120.86502116, 30.0779263 ] } },
{ "type": "Feature", "properties": { }, "geometry": { "type": "Point", "coordinates": [ 120.80201598, 30.0325114 ] } },
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{ "type": "Feature", "properties": { }, "geometry": { "type": "Point", "coordinates": [ 120.8656608, 29.99285332 ] } },
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{ "type": "Feature", "properties": { }, "geometry": { "type": "Point", "coordinates": [ 120.89892242, 30.04998174 ] } },
{ "type": "Feature", "properties": { }, "geometry": { "type": "Point", "coordinates": [ 120.88548984, 30.07013061 ] } },
{ "type": "Feature", "properties": { }, "geometry": { "type": "Point", "coordinates": [ 120.83879565, 30.05445927 ] } },
{ "type": "Feature", "properties": { }, "geometry": { "type": "Point", "coordinates": [ 120.92962545, 30.05381962 ] } },
{ "type": "Feature", "properties": { }, "geometry": { "type": "Point", "coordinates": [ 120.906918, 30.08772089 ] } },
{ "type": "Feature", "properties": { }, "geometry": { "type": "Point", "coordinates": [ 120.88580967, 30.09187859 ] } },
{ "type": "Feature", "properties": { }, "geometry": { "type": "Point", "coordinates": [ 120.80457456, 30.0439051 ] } },
{ "type": "Feature", "properties": { }, "geometry": { "type": "Point", "coordinates": [ 120.79178163, 30.03686899 ] } },
{ "type": "Feature", "properties": { }, "geometry": { "type": "Point", "coordinates": [ 120.81736749, 29.9888955 ] } },
{ "type": "Feature", "properties": { }, "geometry": { "type": "Point", "coordinates": [ 120.86246257, 29.98089992 ] } },
{ "type": "Feature", "properties": { }, "geometry": { "type": "Point", "coordinates": [ 120.82536307, 29.97930081 ] } },
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{ "type": "Feature", "properties": { }, "geometry": { "type": "Point", "coordinates": [ 120.80361509, 29.99529197 ] } },
{ "type": "Feature", "properties": { }, "geometry": { "type": "Point", "coordinates": [ 120.79561951, 29.97354399 ] } },
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{ "type": "Feature", "properties": { }, "geometry": { "type": "Point", "coordinates": [ 120.83527759, 30.11618516 ] } },
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{ "type": "Feature", "properties": { }, "geometry": { "type": "Point", "coordinates": [ 120.87685462, 30.14752784 ] } }
]
}

var fea = obj.features;
var arr = [];
for (let i = 0; i < fea.length; i++) {
  let arrObj = {
    x: 0,
    y: 0,
    z:200
  };
   arrObj.x = fea[i].geometry.coordinates[0];
  arrObj.y = fea[i].geometry.coordinates[1];
  arr.push(arrObj);
}

// console.log("输出数据："+JSON.stringify(arr));