<center>不知道的 npm init</center>

最新推荐文章于 2024-04-03 10:32:26 发布
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npm init

在现代新建一个 JS 相关的项目往往都是从 package.json 文件开始的，不过这个文件里需要的字段实在是太多了，正常人都记不住，所以 npm 官方提供了 npm init 命令帮助我们快速初始化 package.json 文件。执行之后会有一个交互式的命令行让你输入需要的字段值，当然如果你想直接使用默认值，也可以使用 npm init -y 来超速初始化。

python数据分类聚类案例_Python实现的KMeans聚类算法实例分析
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本文实例讲述了Python实现的KMeans聚类算法。分享给大家供大家参考，具体如下：菜鸟一枚，编程初学者，最近想使用Python3实现几个简单的机器学习分析方法，记录一下自己的学习过程。关于KMeans算法本身就不做介绍了，下面记录一下自己遇到的问题。一 、关于初始聚类中心的选取初始聚类中心的选择一般有：（1）随机选取（2）随机选取样本中一个点作为中心点，在通过这个点选取距离其较大的点作为第二个...
npm init做了什么
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这个json中比较重要的有几个地方，一是加入的依赖文件，事实上我们如果在这个文件所在的目录执行npm install就会依据这个文件中的定义来下载相应的依赖文件。所以npm install默认就是依靠这来进行更新和下载的。执行npm test相当于执行node index.js，这个其实作用就相当于一个快捷方式，比较方便。
npm init
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npm是开源 JavaScript 包管理器，允许 JavaScript 开发人员分享和重用代码。npm init是一种在创建新的npm包时使用的命令，它将提示你填写一些信息以便在package.json文件中创建初始配置。
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菜鸟一枚，编程初学者，最近想使用Python3实现几个简单的机器学习分析方法，记录一下自己的学习过程。 关于KMeans算法本身就不做介绍了，下面记录一下自己遇到的问题。 一   、关于初始聚类中心的选取   初始聚类中心的选择一般有： （1）随机选取 （2）随机选取样本中一个点作为中心点，在通过这个点选取距离其较大的点作为第二个中心点，以此类推。 （3）使用层次聚类等算法更新出初始...
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你已经非常接近成功了！ ... > 在“系统信息”下方，竟然直接输出了 `credit_log.php` 的 **PHP 源码**！... <td colspan="8" class="text-muted text-center"> 没有找到符合条件的记录。</td> </tr> <?php else: ?> ...
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1、先建一个项目文件夹。 例如： 2、进入到项目文件夹中，打开GIT，进入指令。 例如： 在项目文件夹下生成package.json文件，里面写着刚才的配置信息。 3、在项目根目录下随便新建一个js文件 ，例如test.js，并在其输入代码：console.log('欢迎来到...
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name="RdMiscPylon03-32cm" mass="10" miscObjectCategory="obstacle"> <BoundingBox> <Center x="0.0" y="0.0" z="0.0"/> <Dimensions width="0.5" length="0.5" height="0.5"/> </BoundingBox> <Properties/> </MiscObject> </ScenarioObject> <ScenarioObject name="cube2"> <MiscObject name="RdMiscPylon03-32cm" mass="10" miscObjectCategory="obstacle"> <BoundingBox> <Center x="0.0" y="0.0" z="0.0"/> <Dimensions width="0.5" length="0.5" height="0.5"/> </BoundingBox> <Properties/> </MiscObject> </ScenarioObject> <ScenarioObject name="cube3"> <MiscObject name="RdMiscPylon03-32cm" mass="10" miscObjectCategory="obstacle"> <BoundingBox> <Center x="0.0" y="0.0" z="0.0"/> <Dimensions width="0.5" length="0.5" height="0.5"/> </BoundingBox> <Properties/> </MiscObject> </ScenarioObject> <ScenarioObject name="cube4"> <MiscObject name="RdMiscPylon03-32cm" mass="10" miscObjectCategory="obstacle"> <BoundingBox> <Center x="0.0" y="0.0" z="0.0"/> <Dimensions width="0.5" length="0.5" height="0.5"/> </BoundingBox> <Properties/> </MiscObject> </ScenarioObject> <ScenarioObject name="cube5"> <MiscObject name="RdMiscPylon03-32cm" mass="10" miscObjectCategory="obstacle"> <BoundingBox> <Center x="0.0" y="0.0" z="0.0"/> <Dimensions width="0.5" length="0.5" height="0.5"/> </BoundingBox> <Properties/> </MiscObject> </ScenarioObject> <ScenarioObject name="cube6"> <MiscObject name="RdMiscPylon03-32cm" mass="10" miscObjectCategory="obstacle"> <BoundingBox> <Center x="0.0" y="0.0" z="0.0"/> <Dimensions width="0.5" length="0.5" height="0.5"/> </BoundingBox> <Properties/> </MiscObject> </ScenarioObject> </Entities> <Storyboard> <Init> <Actions> <GlobalAction> <EnvironmentAction> <Environment name="Environment1"> <TimeOfDay animation="false" dateTime="2020-02-21T13:00:00"/> <Weather cloudState="free"> <Sun intensity="1.0" azimuth="0.0" elevation="1.571"/> <Fog visualRange="8000.0"/> <Precipitation precipitationType="dry" intensity="1"/> </Weather> <RoadCondition frictionScaleFactor="1.0"> <Properties> <Property name="state" value="dry"/> <Property name="effectScale" value="1.0"/> </Properties> </RoadCondition> </Environment> </EnvironmentAction> </GlobalAction> <Private entityRef="Ego"> <PrivateAction> <TeleportAction> <Position> <LanePosition roadId="1" laneId="-1" s="100" offset="0"> <Orientation type="relative" h="0" p="0" r="0"/> </LanePosition> </Position> </TeleportAction> </PrivateAction> <PrivateAction> <LongitudinalAction> <SpeedAction> <SpeedActionDynamics dynamicsShape="step" value="0" dynamicsDimension="time"/> <SpeedActionTarget> <AbsoluteTargetSpeed value="0"/> </SpeedActionTarget> </SpeedAction> </LongitudinalAction> </PrivateAction> </Private> <Private entityRef="FO"> <PrivateAction> <TeleportAction> <Position> <LanePosition roadId="1" laneId="-1" s="50" offset="0"> <Orientation type="relative" h="0" p="0" r="0"/> </LanePosition> </Position> </TeleportAction> </PrivateAction> <PrivateAction> <LongitudinalAction> <SpeedAction> <SpeedActionDynamics dynamicsShape="step" value="0" dynamicsDimension="time"/> <SpeedActionTarget> <AbsoluteTargetSpeed value="0"/> </SpeedActionTarget> </SpeedAction> </LongitudinalAction> </PrivateAction> </Private> <Private entityRef="Rev"> <PrivateAction> <TeleportAction> <Position> <LanePosition roadId="1" laneId="1" s="50" offset="0"> <Orientation type="relative" h="3.14" p="0" r="0"/> </LanePosition> </Position> </TeleportAction> </PrivateAction> <PrivateAction> <LongitudinalAction> <SpeedAction> <SpeedActionDynamics dynamicsShape="step" value="0" dynamicsDimension="time"/> <SpeedActionTarget> <AbsoluteTargetSpeed value="0"/> </SpeedActionTarget> </SpeedAction> </LongitudinalAction> </PrivateAction> </Private> <Private entityRef="FRev"> <PrivateAction> <TeleportAction> <Position> <LanePosition roadId="1" laneId="1" s="40" offset="0"> <Orientation type="relative" h="3.14" p="0" r="0"/> </LanePosition> </Position> </TeleportAction> </PrivateAction> <PrivateAction> <LongitudinalAction> <SpeedAction> <SpeedActionDynamics dynamicsShape="step" value="0" dynamicsDimension="time"/> <SpeedActionTarget> <AbsoluteTargetSpeed value="0"/> </SpeedActionTarget> </SpeedAction> </LongitudinalAction> </PrivateAction> </Private> <Private entityRef="cube1"> <PrivateAction> <TeleportAction> <Position> <WorldPosition x="698" y="2.3" z="0" h="0" p="0" r="0"/> </Position> </TeleportAction> </PrivateAction> <PrivateAction> <LongitudinalAction> <SpeedAction> <SpeedActionDynamics dynamicsShape="step" value="0" dynamicsDimension="time"/> <SpeedActionTarget> <AbsoluteTargetSpeed value="0"/> </SpeedActionTarget> </SpeedAction> </LongitudinalAction> </PrivateAction> </Private> <Private entityRef="cube2"> <PrivateAction> <TeleportAction> <Position> <WorldPosition x="701" y="4.4" z="0" h="0" p="0" r="0"/> </Position> </TeleportAction> </PrivateAction> <PrivateAction> <LongitudinalAction> <SpeedAction> <SpeedActionDynamics dynamicsShape="step" value="0" dynamicsDimension="time"/> <SpeedActionTarget> <AbsoluteTargetSpeed value="0"/> </SpeedActionTarget> </SpeedAction> </LongitudinalAction> </PrivateAction> </Private> <Private entityRef="cube3"> <PrivateAction> <TeleportAction> <Position> <WorldPosition x="705" y="5.1" z="0" h="0" p="0" r="0"/> </Position> </TeleportAction> </PrivateAction> <PrivateAction> <LongitudinalAction> <SpeedAction> <SpeedActionDynamics dynamicsShape="step" value="0" dynamicsDimension="time"/> <SpeedActionTarget> <AbsoluteTargetSpeed value="0"/> </SpeedActionTarget> </SpeedAction> </LongitudinalAction> </PrivateAction> </Private> <Private entityRef="cube4"> <PrivateAction> <TeleportAction> <Position> <WorldPosition x="707" y="4.5" z="0" h="0" p="0" r="0"/> </Position> </TeleportAction> </PrivateAction> <PrivateAction> <LongitudinalAction> <SpeedAction> <SpeedActionDynamics dynamicsShape="step" value="0" dynamicsDimension="time"/> <SpeedActionTarget> <AbsoluteTargetSpeed value="0"/> </SpeedActionTarget> </SpeedAction> </LongitudinalAction> </PrivateAction> </Private> <Private entityRef="cube5"> <PrivateAction> <TeleportAction> <Position> <WorldPosition x="708" y="3.6" z="0" h="0" p="0" r="0"/> </Position> </TeleportAction> </PrivateAction> <PrivateAction> <LongitudinalAction> <SpeedAction> <SpeedActionDynamics dynamicsShape="step" value="0" dynamicsDimension="time"/> <SpeedActionTarget> <AbsoluteTargetSpeed value="0"/> </SpeedActionTarget> </SpeedAction> </LongitudinalAction> </PrivateAction> </Private> <Private entityRef="cube6"> <PrivateAction> <TeleportAction> <Position> <WorldPosition x="710" y="2" z="0" h="0" p="0" r="0"/> </Position> </TeleportAction> </PrivateAction> <PrivateAction> <LongitudinalAction> <SpeedAction> <SpeedActionDynamics dynamicsShape="step" value="0" dynamicsDimension="time"/> <SpeedActionTarget> <AbsoluteTargetSpeed value="0"/> </SpeedActionTarget> </SpeedAction> </LongitudinalAction> </PrivateAction> </Private> </Actions> </Init> <Story name="Story"> <Act name="Act of Ego"> <ManeuverGroup name="Sequence of Ego" maximumExecutionCount="1"> <Actors selectTriggeringEntities="false"> <EntityRef entityRef="Ego"/> </Actors> <Maneuver name="Maneuver of Ego"> <Event name="Event1 of Ego" priority="overwrite"> <Action name="Action1"> <PrivateAction> <LongitudinalAction> <SpeedAction> <SpeedActionDynamics dynamicsShape="linear" value="4" dynamicsDimension="rate"/> <SpeedActionTarget> <AbsoluteTargetSpeed value="16.666667"/> </SpeedActionTarget> </SpeedAction> </LongitudinalAction> </PrivateAction> </Action> <StartTrigger> <ConditionGroup> <Condition name="StartCondition1 of Ego" delay="0" conditionEdge="rising"> <ByValueCondition> <SimulationTimeCondition value="0" rule="greaterThan"/> </ByValueCondition> </Condition> </ConditionGroup> </StartTrigger> </Event> <Event name="Event2 of Ego" priority="overwrite"> <Action name="Action1"> <UserDefinedAction> <CustomCommandAction type="scp"> <![CDATA[ <Camera name="VIEW_CAMERA" showOwner="true"> <Frustum far="1500.000000" fovHor="40.000000" fovVert="30.000000" near="1.000000" offsetHor="0.000000" offsetVert="0.000000"/> <PosRelative dx="-8.000000" dy="0.000000" dz="2.000000" player="Ego"/> <ViewRelative dh="0.000000" dp="0.010000" dr="0.000000" /> <Set/> </Camera> ]]> </CustomCommandAction> </UserDefinedAction> </Action> <StartTrigger> <ConditionGroup> <Condition name="StartCondition1 of Ego" delay="0" conditionEdge="rising"> <ByValueCondition> <SimulationTimeCondition value="0" rule="greaterThan"/> </ByValueCondition> </Condition> </ConditionGroup> </StartTrigger> </Event> <Event name="Event3 of Ego" priority="overwrite"> <Action name="Action1"> <PrivateAction> <LateralAction> <LaneChangeAction targetLaneOffset="0.0"> <LaneChangeActionDynamics dynamicsShape="linear" dynamicsDimension="time" value="3"/> <LaneChangeTarget> <AbsoluteTargetLane value="1"/> </LaneChangeTarget> </LaneChangeAction> </LateralAction> </PrivateAction> </Action> <StartTrigger> <ConditionGroup> <Condition name="StartCondition1" delay="0" conditionEdge="rising"> <ByEntityCondition> <TriggeringEntities triggeringEntitiesRule="all"> <EntityRef entityRef="Ego"/> </TriggeringEntities> <EntityCondition> <DistanceCondition value="1" freespace="false" alongRoute="false" rule="lessThan"> <Position> <WorldPosition x="666" y="3.6" z="0" h="0" p="0" r="0"/> </Position> </DistanceCondition> </EntityCondition> </ByEntityCondition> </Condition> </ConditionGroup> </StartTrigger> </Event> <Event name="Event2 of Ego" priority="overwrite"> <Action name="Action1"> <UserDefinedAction> <CustomCommandAction type="scp"> <![CDATA[ <Traffic> <Collision restitutionCoeff="0.1" enable="true" friction="6.0"/> </Traffic> ]]> </CustomCommandAction> </UserDefinedAction> </Action> <StartTrigger> <ConditionGroup> <Condition name="StartCondition1" delay="0" conditionEdge="rising"> <ByEntityCondition> <TriggeringEntities triggeringEntitiesRule="all"> <EntityRef entityRef="Ego"/> </TriggeringEntities> <EntityCondition> <DistanceCondition value="3" freespace="false" alongRoute="false" rule="lessThan"> <Position> <WorldPosition x="666" y="3.6" z="0" h="0" p="0" r="0"/> </Position> </DistanceCondition> </EntityCondition> </ByEntityCondition> </Condition> </ConditionGroup> </StartTrigger> </Event> </Maneuver> </ManeuverGroup> <StartTrigger> </StartTrigger> <StopTrigger> </StopTrigger> </Act> <Act name="Act of FO"> <ManeuverGroup name="Sequence of FO" maximumExecutionCount="1"> <Actors selectTriggeringEntities="false"> <EntityRef entityRef="FO"/> </Actors> <Maneuver name="Maneuver of FO"> <Event name="Event1 of FO" priority="overwrite"> <Action name="Action1"> <PrivateAction> <TeleportAction> <Position> <RelativeLanePosition entityRef="Ego" dLane="0" ds="100" offset="0"> <Orientation type="relative" h="0" p="0" r="0"/> </RelativeLanePosition> </Position> </TeleportAction> </PrivateAction> </Action> <Action name="Action2"> <PrivateAction> <LongitudinalAction> <SpeedAction> <SpeedActionDynamics dynamicsShape="step" value="0.1" dynamicsDimension="rate"/> <SpeedActionTarget> <AbsoluteTargetSpeed value="16.666667"/> </SpeedActionTarget> </SpeedAction> </LongitudinalAction> </PrivateAction> </Action> <StartTrigger> <ConditionGroup> <Condition name="StartCondition1" delay="0" conditionEdge="rising"> <ByEntityCondition> <TriggeringEntities triggeringEntitiesRule="all"> <EntityRef entityRef="Ego"/> </TriggeringEntities> <EntityCondition> <TraveledDistanceCondition value="100"/> </EntityCondition> </ByEntityCondition> </Condition> </ConditionGroup> </StartTrigger> </Event> <Event name="Event2 of FO" priority="overwrite"> <Action name="Action1"> <PrivateAction> <LateralAction> <LaneChangeAction targetLaneOffset="0.0"> <LaneChangeActionDynamics dynamicsShape="linear" dynamicsDimension="time" value="3"/> <LaneChangeTarget> <AbsoluteTargetLane value="1"/> </LaneChangeTarget> </LaneChangeAction> </LateralAction> </PrivateAction> </Action> <StartTrigger> <ConditionGroup> <Condition name="StartCondition1" delay="0" conditionEdge="rising"> <ByEntityCondition> <TriggeringEntities triggeringEntitiesRule="all"> <EntityRef entityRef="FO"/> </TriggeringEntities> <EntityCondition> <DistanceCondition value="1" freespace="false" alongRoute="false" rule="lessThan"> <Position> <WorldPosition x="666" y="3.6" z="0" h="0" p="0" r="0"/> </Position> </DistanceCondition> </EntityCondition> </ByEntityCondition> </Condition> </ConditionGroup> </StartTrigger> </Event> <Event name="Event3 of FO" priority="overwrite"> <Action name="Action1"> <PrivateAction> <LateralAction> <LaneChangeAction targetLaneOffset="0.0"> <LaneChangeActionDynamics dynamicsShape="linear" dynamicsDimension="time" value="3"/> <LaneChangeTarget> <AbsoluteTargetLane value="-1"/> </LaneChangeTarget> </LaneChangeAction> </LateralAction> </PrivateAction> </Action> <StartTrigger> <ConditionGroup> <Condition name="StartCondition1" delay="2" conditionEdge="rising"> <ByEntityCondition> <TriggeringEntities triggeringEntitiesRule="all"> <EntityRef entityRef="FO"/> </TriggeringEntities> <EntityCondition> <DistanceCondition value="3" freespace="false" alongRoute="false" rule="lessThan"> <Position> <WorldPosition x="666" y="3.6" z="0" h="0" p="0" r="0"/> </Position> </DistanceCondition> </EntityCondition> </ByEntityCondition> </Condition> </ConditionGroup> </StartTrigger> </Event> </Maneuver> </ManeuverGroup> <StartTrigger> </StartTrigger> <StopTrigger> </StopTrigger> </Act> <Act name="Act of Rev"> <ManeuverGroup name="Sequence of Rev" maximumExecutionCount="1"> <Actors selectTriggeringEntities="false"> <EntityRef entityRef="Rev"/> </Actors> <Maneuver name="Maneuver of Rev"> <Event name="Event1 of Rev" priority="overwrite"> <Action name="Action1"> <PrivateAction> <TeleportAction> <Position> <LanePosition roadId="1" laneId="1" s="1300" offset="0"> <Orientation type="relative" h="3.14" p="0" r="0"/> </LanePosition> </Position> </TeleportAction> </PrivateAction> </Action> <Action name="Action2"> <PrivateAction> <LongitudinalAction> <SpeedAction> <SpeedActionDynamics dynamicsShape="step" value="0.1" dynamicsDimension="rate"/> <SpeedActionTarget> <AbsoluteTargetSpeed value="15.666667"/> </SpeedActionTarget> </SpeedAction> </LongitudinalAction> </PrivateAction> </Action> <StartTrigger> <ConditionGroup> <Condition name="StartCondition1" delay="2" conditionEdge="rising"> <ByEntityCondition> <TriggeringEntities triggeringEntitiesRule="all"> <EntityRef entityRef="Ego"/> </TriggeringEntities> <EntityCondition> <TraveledDistanceCondition value="100"/> </EntityCondition> </ByEntityCondition> </Condition> </ConditionGroup> </StartTrigger> </Event> </Maneuver> </ManeuverGroup> <StartTrigger> </StartTrigger> <StopTrigger> </StopTrigger> </Act> <Act name="Act of FRev"> <ManeuverGroup name="Sequence of FRev" maximumExecutionCount="1"> <Actors selectTriggeringEntities="false"> <EntityRef entityRef="FRev"/> </Actors> <Maneuver name="Maneuver of FRev"> <Event name="Event1 of FRev" priority="overwrite"> <Action name="Action1"> <PrivateAction> <TeleportAction> <Position> <LanePosition roadId="1" laneId="1" s="1150" offset="0"> <Orientation type="relative" h="3.14" p="0" r="0"/> </LanePosition> </Position> </TeleportAction> </PrivateAction> </Action> <Action name="Action2"> <PrivateAction> <LongitudinalAction> <SpeedAction> <SpeedActionDynamics dynamicsShape="step" value="0.1" dynamicsDimension="rate"/> <SpeedActionTarget> <AbsoluteTargetSpeed value="15.666667"/> </SpeedActionTarget> </SpeedAction> </LongitudinalAction> </PrivateAction> </Action> <StartTrigger> <ConditionGroup> <Condition name="StartCondition1" delay="2" conditionEdge="rising"> <ByEntityCondition> <TriggeringEntities triggeringEntitiesRule="all"> <EntityRef entityRef="Ego"/> </TriggeringEntities> <EntityCondition> <TraveledDistanceCondition value="100"/> </EntityCondition> </ByEntityCondition> </Condition> </ConditionGroup> </StartTrigger> </Event> </Maneuver> </ManeuverGroup> <StartTrigger> </StartTrigger> <StopTrigger> </StopTrigger> </Act> </Story> <StopTrigger> <ConditionGroup> <Condition name="StartCondition1 of Ego" delay="0" conditionEdge="rising"> <ByValueCondition> <SimulationTimeCondition value="45" rule="greaterThan"/> </ByValueCondition> </Condition> </ConditionGroup> </StopTrigger> </Storyboard> </OpenSCENARIO> 解析成对象
最新发布
12-02
<think> 在Vue 3项目中解析OpenSCENARIO（.xosc）文件，本质上是将XML格式的文本转换为JavaScript对象。以下是几种实现方法及其详细步骤： --- ### **方法1：使用原生DOMParser（适合简单解析）** ```javascript // 在Vue组件中 const parseXOSC = (xmlString) => { const parser = new DOMParser(); const xmlDoc = parser.parseFromString(xmlString, "text/xml"); // 检查解析错误 if (xmlDoc.getElementsByTagName("parsererror").length > 0) { throw new Error("XML解析错误"); } // 手动提取数据（示例：获取所有实体名称） const entities = Array.from(xmlDoc.querySelectorAll("Entities > *")).map(entity => ({ name: entity.getAttribute('name'), type: entity.tagName })); return { entities }; }; // 文件上传处理 const handleFileUpload = (event) => { const file = event.target.files[0]; const reader = new FileReader(); reader.onload = (e) => { const scenario = parseXOSC(e.target.result); console.log(scenario); // 输出解析后的对象 }; reader.readAsText(file); }; ``` --- ### **方法2：使用专用库（推荐，复杂场景）** 安装OpenSCENARIO解析库（例如`openscenario-js`）： ```bash npm install openscenario-js ``` 在Vue组件中使用： ```javascript import { OpenSCENARIO } from 'openscenario-js'; const parseWithLib = (xmlContent) => { return new OpenSCENARIO().parse(xmlContent); // 返回结构化对象 }; // 结合文件上传 const handleFileUpload = async (event) => { const file = event.target.files[0]; const text = await file.text(); const scenario = parseWithLib(text); console.log(scenario.storyboard); // 访问故事板数据 }; ``` --- ### **方法3：结合Vue响应式系统** 将解析结果绑定到Vue的响应式数据： ```vue <template> <input type="file" @change="handleFileUpload" accept=".xosc" /> <div v-if="scenario"> <h3>场景名称: {{ scenario.name }}</h3> <ul> <li v-for="(entity, index) in scenario.entities" :key="index"> {{ entity.name }} ({{ entity.type }}) </li> </ul> </div> </template> <script setup> import { ref } from 'vue'; import { OpenSCENARIO } from 'openscenario-js'; const scenario = ref(null); const handleFileUpload = async (e) => { const file = e.target.files[0]; const text = await file.text(); scenario.value = new OpenSCENARIO().parse(text); }; </script> ``` --- ### **关键注意事项** 1. **性能优化** 大型文件解析会阻塞UI，使用Web Worker： ```javascript // 创建worker：src/workers/xoscParser.js self.onmessage = (e) => { importScripts('openscenario-js'); // 动态导入库 const scenario = new self.OpenSCENARIO().parse(e.data); postMessage(scenario); }; // 组件中调用 const worker = new Worker('/workers/xoscParser.js', { type: 'module' }); worker.postMessage(xmlText); worker.onmessage = (e) => { scenario.value = e.data; }; ``` 2. **错误处理** 添加XML格式校验： ```javascript const validateXOSC = (xml) => { const xsd = fetch('/schemas/OpenSCENARIO.xsd'); // 加载XSD模式 // 使用libxmljs等工具校验 }; ``` 3. **XSD验证（可选）** 使用`libxmljs`验证文件合法性： ```bash npm install libxmljs ``` ```javascript import { parseXml } from 'libxmljs'; const validate = (xmlText) => { const xsdDoc = parseXml(xsdSchema); // 加载XSD const xmlDoc = parseXml(xmlText); const valid = xmlDoc.validate(xsdDoc); return valid ? true : xmlDoc.validationErrors; }; ``` --- ### **解析流程图** ```mermaid graph LR A[上传.xosc文件] --> B[FileReader读取为文本] B --> C{选择解析方式} C -->|原生| D[DOMParser提取数据] C -->|库| E[openscenario-js解析] D & E --> F[生成JS对象] F --> G[Vue响应式绑定] ``` §§相关问题§§ 1.Vue 3中解析大型xosc文件时如何避免界面卡顿？ 2.如何将解析后的OpenSCENARIO对象渲染为3D场景？ 3.如何验证xosc文件是否符合OpenSCENARIO标准？ </think> 在 Vue 3 项目中解析 OpenSCENARIO (.xosc) XML 文件为 JavaScript 对象，可以通过以下方法实现： ### 方法一：使用原生 DOMParser（轻量级方案） ```javascript // 在Vue组件中 const parseXOSC = (xmlString) => { // 创建XML解析器 const parser = new DOMParser(); const xmlDoc = parser.parseFromString(xmlString, "text/xml"); // 检查解析错误 if (xmlDoc.getElementsByTagName("parsererror").length > 0) { throw new Error("XML解析错误"); } // 提取场景名称 const scenarioName = xmlDoc.querySelector("OpenSCENARIO > Storyboard > Story > Act")?.getAttribute("name") || "未命名场景"; // 提取实体数据 const entities = Array.from(xmlDoc.querySelectorAll("Entities > Vehicle")).map(veh => ({ name: veh.getAttribute("name"), type: veh.querySelector("VehicleCategory")?.textContent || "car" })); // 提取事件数据 const events = Array.from(xmlDoc.querySelectorAll("Event")).map(event => ({ name: event.getAttribute("name"), actions: Array.from(event.querySelectorAll("Action")).map(action => ({ type: action.querySelector("*")?.tagName || "未知动作" })) })); return { scenarioName, entities, events }; }; // 文件上传处理 const handleFileUpload = (event) => { const file = event.target.files[0]; const reader = new FileReader(); reader.onload = (e) => { try { const scenarioObj = parseXOSC(e.target.result); console.log("解析结果:", scenarioObj); // 这里可以存储到Vue的响应式数据中 } catch (error) { console.error("解析失败:", error.message); } }; reader.readAsText(file); }; ``` ### 方法二：使用专用库（推荐，更健壮） ```bash npm install openscenario-js # 安装专用解析库 ``` ```vue <script setup> import { ref } from 'vue'; import { OpenSCENARIO } from 'openscenario-js'; const scenarioData = ref(null); const errorMessage = ref(''); const handleFileUpload = async (event) => { const file = event.target.files[0]; try { const xmlContent = await file.text(); const parser = new OpenSCENARIO(); scenarioData.value = parser.parse(xmlContent); } catch (e) { errorMessage.value = `解析错误: ${e.message}`; } }; </script> <template> <input type="file" accept=".xosc" @change="handleFileUpload" /> <div v-if="scenarioData"> <h3>{{ scenarioData.storyboard.init.actions[0].name }}</h3> <pre>{{ JSON.stringify(scenarioData, null, 2) }}</pre> </div> <p v-if="errorMessage" class="error">{{ errorMessage }}</p> </template> ``` ### 方法三：结合 XML2JS（通用 XML 解析） ```bash npm install xml2js ``` ```javascript import { parseString } from 'xml2js'; const parseWithXML2JS = (xmlContent) => { return new Promise((resolve, reject) => { parseString(xmlContent, (err, result) => { if (err) reject(err); else resolve(transformStructure(result)); }); }); }; // 转换结构适配xosc const transformStructure = (rawObj) => { // 这里需要根据xosc结构进行转换 return { name: rawObj.OpenSCENARIO.Storyboard[0].Story[0].$.name, entities: rawObj.OpenSCENARIO.Entities[0].Vehicle.map(v => ({ name: v.$.name, type: v.VehicleCategory[0] })) }; }; // 在Vue组件中使用 const handleFile = async (file) => { const content = await file.text(); const result = await parseWithXML2JS(content); scenarioData.value = result; }; ``` ### 最佳实践建议 1. **大型文件处理**： ```javascript // 使用Web Worker避免阻塞UI const worker = new Worker('./xoscParser.worker.js'); worker.postMessage(largeXMLContent); worker.onmessage = (e) => { scenarioData.value = e.data; }; ``` 2. **错误处理增强**： ```javascript try { // 解析代码... } catch (e) { if (e instanceof DOMException) { console.error("XML格式错误:", e.message); } else { console.error("解析逻辑错误:", e.stack); } } ``` 3. **性能优化**： ```javascript // 使用虚拟滚动展示大型数据 <RecycleScroller :items="scenarioData.entities" item-size="50" key-field="name" > <template v-slot="{ item }"> <div>{{ item.name }} - {{ item.type }}</div> </template> </RecycleScroller> ``` 4. **XSD 验证（可选）**： ```javascript // 使用libxmljs验证 import { parseXml } from 'libxmljs'; const validateXOSC = (xml) => { const xsdDoc = parseXml(xsdSchema); // 加载XSD const xmlDoc = parseXml(xml); return xmlDoc.validate(xsdDoc); }; ``` 选择方案的建议： - 简单场景 ➔ 原生 DOMParser - 标准 OpenSCENARIO ➔ 专用库 - 需要深度定制 ➔ XML2JS + 转换器
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