如何在Three.js中修改顶点后导出网格？

var geometry = new THREE.Geometry();
var material = new THREE.MeshBasicMaterial({ color: 0x00ff00 });
var mesh = new THREE.Mesh(geometry, material);

mesh.geometry.vertices[0].y += 10;
mesh.geometry.verticesNeedUpdate = true;

// 使用OBJLoader导出为OBJ格式
var exporter = new THREE.OBJExporter();
var objData = exporter.parse(mesh);
console.log(objData);

// 使用STLExporter导出为STL格式
var exporter = new THREE.STLExporter();
var stlData = exporter.parse(mesh);
console.log(stlData);