Chapter-08/03-load-save-json-object.html !help me! 3Dmodel to load

Questions
, , ,
1

english:
I am a beginner,
Why is Import-Export Three.js Format not included in blender?

I am studying along with Chapter 8.
Please help me if you can explain politely

japanese:
私は初心者です、
何故、Import-Export Three.js Formatがblenderに入ってないんですか？

8章にそって勉強しています。
丁寧に説明してくれる方、私を助けてください

2 
// once everything is loaded, we run our Three.js stuff.
function init() {

    var stats = initStats();

    // create a scene, that will hold all our elements such as objects, cameras and lights.
    var scene = new THREE.Scene();

    // create a camera, which defines where we're looking at.
    var camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 0.1, 1000);

    // create a render and set the size
    var webGLRenderer = new THREE.WebGLRenderer();
    webGLRenderer.setClearColor(new THREE.Color(0xEEEEEE));
    webGLRenderer.setSize(window.innerWidth, window.innerHeight);
    webGLRenderer.shadowMap.enabled = true;

    var knot = createMesh(new THREE.TorusKnotGeometry(10, 1, 64, 8, 2, 3));
    // add the sphere to the scene
    scene.add(knot);

    // position and point the camera to the center of the scene
    camera.position.x = -30;
    camera.position.y = 40;
    camera.position.z = 50;
    camera.lookAt(new THREE.Vector3(-20, 0, 0));

    // add the output of the renderer to the html element
    document.getElementById("WebGL-output").appendChild(webGLRenderer.domElement);

    // call the render function
    var step = 0;


    var loadedMesh;

    // setup the control gui
    var controls = new function () {

        console.log(knot.geometry.parameters);
        // we need the first child, since it's a multimaterial
        this.radius = knot.geometry.parameters.radius;
        this.tube = 0.3;
        this.radialSegments = knot.geometry.parameters.radialSegments;
        this.tubularSegments = knot.geometry.parameters.tubularSegments;
        this.p = knot.geometry.parameters.p;
        this.q = knot.geometry.parameters.q;

        this.redraw = function () {
            // remove the old plane
            scene.remove(knot);
            // create a new one
            knot = createMesh(new THREE.TorusKnotGeometry(controls.radius, controls.tube, Math.round(controls.radialSegments), Math.round(controls.tubularSegments), Math.round(controls.p), Math.round(controls.q)));
            // add it to the scene.
            scene.add(knot);
        };

        this.save = function () {

console.log(scene.toJSON());
var result = knot.toJSON();
localStorage.setItem(“json”, JSON.stringify(result));
};

        this.load = function () {

            scene.remove(loadedMesh);

            var json = localStorage.getItem("json");

            if (json) {
                var loadedGeometry = JSON.parse(json);
                var loader = new THREE.ObjectLoader();

                loadedMesh = loader.parse(loadedGeometry);
                loadedMesh.position.x -= 50;
                scene.add(loadedMesh);
            }
        }
    };

    var gui = new dat.GUI();
    var ioGui = gui.addFolder('Save & Load');
    ioGui.add(controls, 'save').onChange(controls.save);
    ioGui.add(controls, 'load').onChange(controls.load);
    var meshGui = gui.addFolder('mesh');
    meshGui.add(controls, 'radius', 0, 40).onChange(controls.redraw);
    meshGui.add(controls, 'tube', 0, 40).onChange(controls.redraw);
    meshGui.add(controls, 'radialSegments', 0, 400).step(1).onChange(controls.redraw);
    meshGui.add(controls, 'tubularSegments', 1, 20).step(1).onChange(controls.redraw);
    meshGui.add(controls, 'p', 1, 10).step(1).onChange(controls.redraw);
    meshGui.add(controls, 'q', 1, 15).step(1).onChange(controls.redraw);


    render();

    function createMesh(geom) {

        // assign two materials
        var meshMaterial = new THREE.MeshBasicMaterial({
            vertexColors: THREE.VertexColors,
            wireframe: true,
            wireframeLinewidth: 2,
            color: 0xaaaaaa
        });
        meshMaterial.side = THREE.DoubleSide;

        // create a multimaterial
        var mesh = new THREE.Mesh(geom, meshMaterial);

        return mesh;
    }

    function render() {
        stats.update();

        knot.rotation.y = step += 0.01;

        // render using requestAnimationFrame
        requestAnimationFrame(render);
        webGLRenderer.render(scene, camera);
    }

    function initStats() {

        var stats = new Stats();
        stats.setMode(0); // 0: fps, 1: ms

        // Align top-left
        stats.domElement.style.position = 'absolute';
        stats.domElement.style.left = '0px';
        stats.domElement.style.top = '0px';

        document.getElementById("Stats-output").appendChild(stats.domElement);

        return stats;
    }
}
window.onload = init;