本文主要是介绍three.js 按键W前进、S退后、A左转、D右转运动，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
效果：W 键 前进；S 键后退；A 键左转；D 键右转；使用了 tween.js 动画库；
代码：
<template><div><el-container><el-main><div class="box-card-left"><div id="threejs"></div></div></el-main></el-container></div>
</template>s
<script>
// 引入轨道控制器扩展库OrbitControls.js
import { OrbitControls } from "three/examples/jsm/controls/OrbitControls.js";
import { GLTFLoader } from "three/examples/jsm/loaders/GLTFLoader.js";
import TWEEN from '@tweenjs/tween.js';
export default {data() {return {scene: null,camera: null,renderer: null,res1: null,res2: null,clock: null,keyState: {W: false,S: false,A: false,D: false,},left_rotation: true, // 向左旋转的标志right_rotation: true, // 向右旋转的标志VW: new this.$three.Vector3(0, 0, 0),VS: new this.$three.Vector3(0, 0, 0),curr_v: new this.$three.Vector3(0, 0, 0),person: null,deltaTime: 0,a: 30, // 加速度damping: -0.04,};},created() {},mounted() {this.name = this.$route.query.name;this.init();},methods: {goBack() {this.$router.go(-1);},init() {this.clock = new this.$three.Clock();// 创建场景this.scene = new this.$three.Scene();// 创建辅助坐标轴对象const axesHelper = new this.$three.AxesHelper(100);this.scene.add(axesHelper);// 创建环境光const ambientLight = new this.$three.AmbientLight(0xffffff, 10);this.scene.add(ambientLight);// 创建相机对象this.camera = new this.$three.PerspectiveCamera(60,1,0.01,2000);this.camera.position.set(10,10,10);this.camera.lookAt(0,0,0);// 创建渲染器对象this.renderer = new this.$three.WebGLRenderer();this.renderer.setSize(1500,1200);// 创建GLTFLoader对象；加载人物模型const gltfLoader = new GLTFLoader();gltfLoader.load("models/gltf/person2/scene.gltf", gltf => {gltf.scene.position.set(0,0,-10);gltf.scene.scale.set(2,2,2);this.person = gltf.scene;this.scene.add(gltf.scene);this.renderer.render(this.scene, this.camera);window.document.getElementById("threejs").appendChild(this.renderer.domElement);})const controls = new OrbitControls(this.camera, this.renderer.domElement);controls.addEventListener("change", () => {this.renderer.render(this.scene, this.camera);})this.addEventListenerFn();this.renderLoop();},renderLoop() {const deltaTime = this.clock.getDelta();if(this.keyState.W) {if(this.VW.length() < 5) {this.VW.add(new this.$three.Vector3(0,0,1).multiplyScalar(this.a * deltaTime));this.curr_v = this.VW.clone();}let pos = this.VW.clone().multiplyScalar(deltaTime);this.person.position.add(pos);}if(this.keyState.S) {if(this.VS.length() < 5) {this.VS.add(new this.$three.Vector3(0,0,-1).multiplyScalar(this.a * deltaTime));this.curr_v = this.VS.clone();}let pos = this.VS.clone().multiplyScalar(deltaTime);this.person.position.add(pos);}if(this.keyState.A) {}if(this.person) {// .addScaledVector ( v : Vector3, s : Float ) : 将所传入的v与s相乘所得的乘积和这个向量相加。this.curr_v.addScaledVector(this.curr_v, this.damping);let pos = this.curr_v.clone().multiplyScalar(deltaTime);this.person.position.add(pos);}this.renderer.render(this.scene, this.camera);TWEEN.update();requestAnimationFrame(this.renderLoop);},addEventListenerFn() {// 监听按下的 W 键document.addEventListener("keydown", e => {if(e.code == "KeyW") {this.keyState.W = true;}if(e.code == "KeyS") {this.keyState.S = true;}if(e.code == "KeyA") {this.keyState.A = true;if(!this.left_rotation)return false;const tween0 = new TWEEN.Tween(this.person.rotation);let deg = this.$three.MathUtils.radToDeg(this.person.rotation.y);let rad = this.$three.MathUtils.degToRad(deg + 90);if(rad != null) {tween0.to({x:0, y: rad, z:0}, 1000);tween0.start();tween0.onStart(() => {this.left_rotation = false;});tween0.onComplete(() => {this.left_rotation = true;});}}if(e.code == "KeyD") {this.keyState.D = true;if(!this.right_rotation)return false;const tween0 = new TWEEN.Tween(this.person.rotation);let deg = this.$three.MathUtils.radToDeg(this.person.rotation.y);let rad = this.$three.MathUtils.degToRad(deg - 90);if(rad != null) {tween0.to({x:0, y: rad, z:0}, 1000);tween0.start();tween0.onStart(() => {this.right_rotation = false;});tween0.onComplete(() => {this.right_rotation = true;});}}})document.addEventListener("keyup", e => {if(e.code == "KeyW") {this.keyState.W = false;this.VW = new this.$three.Vector3(0, 0, 0);}if(e.code == "KeyS") {this.keyState.S = false;this.VS = new this.$three.Vector3(0, 0, 0);}if(e.code == "KeyA") {this.keyState.A = false;}if(e.code == "KeyD") {this.keyState.D = false;}})}},
};
</script>
<style lang="less" scoped>
.box-card-left {display: flex;align-items: flex-start;flex-direction: row;width: 100%;.box-right {img {width: 500px;user-select: none;}}
}
</style>
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