如何使用数组变量加载多个stl文件

Question

    var stlpath = '../assets/models/stl/part';
    var stlformat = '.stl';
    var part = new Array();

    for( var i = 1; i<28; i++){

        var url = stlpath + i + stlformat;

        stlloader.load(url, function (geometry) {
            console.log(geometry);

            var mat = new THREE.MeshLambertMaterial( {color: 0xffffff} );

            part = new THREE.Mesh(geometry, mat);
            part.rotation.x = -0.5 * Math.PI; part.rotation.z = -0.5 * Math.PI;
            part.position.set(0, -15, 0);
            part.scale.set(0.3, 0.3, 0.3);
            part.castShadow = true;
            part.receiveShadow = true;

            scene.add(part);
        });
    }

我已使用此代码成功加载了多个stl文件。但是这段代码只用一个变量“part”来保存stl文件，所以我无法处理每个stl文件。我想用分离的变量调整每个stl。

我尝试将数组用作变量。

    var stlpath = '../assets/models/stl/part';
    var stlformat = '.stl';
    var part = new Array();

    for( var i = 1; i<28; i++){

        var url = stlpath + i + stlformat;

        stlloader.load(url, function (geometry) {
            console.log(geometry);

            var mat = new THREE.MeshLambertMaterial( {color: 0xffffff} );

            part[i] = new THREE.Mesh(geometry, mat);
            part[i].rotation.x = -0.5 * Math.PI; part.rotation.z = -0.5 * Math.PI;
            part[i].position.set(0, -15, 0);
            part[i].scale.set(0.3, 0.3, 0.3);
            part[i].castShadow = true;
            part[i].receiveShadow = true;

            scene.add(part[i]);
        });
    }

但是这段代码在没有任何错误消息的情况下无效。我不知道为什么它不起作用。你能提出任何建议，解决方案或例子吗？

谢谢