let idsList: any = selectIdArr.value.map((item) => { return item.id })代码有什么用

这段代码用于将数组 `selectIdArr` 中的每个对象的 `id` 属性提取出来，形成一个新的数组 `idsList`。具体来说，`Array.map()` 方法会对 `selectIdArr` 数组中的每个元素执行一次回调函数，将回调函数返回的值组成一个新的数组返回。在这里，回调函数是一个箭头函数，它的作用是提取当前元素的 `id` 属性并返回。最终，`idsList` 数组就是由 `selectIdArr` 数组中每个对象的 `id` 属性组成的新数组。

相关问题

优化这段代码：let dataList = async (value) =>{ const res:any = await queryById({ id: value.id }); if(res.status) { parameter.recordData.header = value; parameter.recordData.header.occurrenceTime = dayjs(parameter.recordData.header.occurrenceTime).format('YYYY-MM-DD HH:mm'); let defectSource = defectSourceArr.find(item =>item.id == value.defectSourceId); parameter.recordData.header.stitchingDefectSource = `${defectSource.name}/${value.defectSourceName}`; parameter.recordData.detail = res.data.problemDefectList.map((item)=>{ item.displayScreen = item.displayScreen?item.displayScreen.split(','):[]; item.defectDetailList.defectDetailName = item.defectDetailList.map((item)=>{ return item.defectTypeName+'/'+item.defectDetailName; }); item.defectDetailList.defectDetailName = item.defectDetailList.defectDetailName.join('，'); return item; }); getSteps(value.id); }else { parameter.recordData.header = {}; parameter.recordData.detail = []; message.warning('此单据详细数据查询未成功，请检查单据是否存在'); } };

下面是对代码的优化：

let dataList = async (value) => {
  try {
    const res = await queryById({ id: value.id });
    if (res.status) {
      parameter.recordData.header = {
        ...value,
        occurrenceTime: dayjs(value.occurrenceTime).format('YYYY-MM-DD HH:mm'),
        stitchingDefectSource: `${defectSourceArr.find(item => item.id == value.defectSourceId)?.name}/${value.defectSourceName}`
      };
      parameter.recordData.detail = res.data.problemDefectList.map((item) => {
        item.displayScreen = item.displayScreen ? item.displayScreen.split(',') : [];
        item.defectDetailList.defectDetailName = item.defectDetailList.map((detail) => {
          return `${detail.defectTypeName}/${detail.defectDetailName}`;
        }).join('，');
        return item;
      });
      getSteps(value.id);
    } else {
      parameter.recordData.header = {};
      parameter.recordData.detail = [];
      message.warning('此单据详细数据查询未成功，请检查单据是否存在');
    }
  } catch (error) {
    console.error(`queryById error: ${error}`);
    message.error('获取数据失败，请稍后重试');
  }
};

优化点如下：

1. 使用 try-catch 语句捕获异常，避免代码抛出错误后程序崩溃。
2. 使用对象解构和展开语法简化代码，避免多次设置对象属性。
3. 使用可选链操作符 `?.` 简化代码，避免因为找不到对象属性而抛出错误。
4. 使用箭头函数和模板字符串简化代码，提高代码可读性和可维护性。
5. 使用 `console.error()` 和 `message.error()` 输出错误信息，便于调试和排查问题。

private async parseMaterial(osgStateSet: any) { let material = new THREE.MeshBasicMaterial({ // side: THREE.DoubleSide, }); //THREE.FrontSide 背面 // THREE.BackSide 前面 // THREE.DoubleSide 双面 let osgImage = osgStateSet.TextureAttributeList[0].value.StateAttribute.Image; // let texture = this.parseImage(osgImage); let fileName = osgImage.Name; const isJPEG = fileName.search(/.jpe?g($|?)/i) > 0; const isPNG = fileName.search(/.png($|?)/i) > 0; if (!isPNG && !isJPEG) { return; } let mimeType = isPNG ? 'image/png' : 'image/jpeg'; let imageUri: any = new Blob([osgImage.Data], { type: mimeType }); let base64 = await this.blobToBase64(imageUri); // debugger let imageUrl: any = URL.createObjectURL(imageUri); try { let texture = new THREE.TextureLoader().load(base64, () => { texture.needsUpdate = true; // texture.format = THREE.RGBAFormat; texture.type = THREE.UnsignedShort5551Type; texture.minFilter = THREE.LinearMipmapNearestFilter; texture.magFilter = THREE.LinearMipmapNearestFilter; texture.generateMipmaps = false; // texture.format = THREE.RGBAIntegerFormat; // texture.minFilter = THREE.NearestFilter; // texture.magFilter = THREE.NearestFilter; // texture.minFilter = THREE.LinearMipMapLinearFilter; // texture.magFilter = THREE.LinearFilter; // texture.wrapS = THREE.RepeatWrapping; // texture.wrapT = THREE.RepeatWrapping; // texture.anisotropy = 1; // texture.generateMipmaps = false; // texture.encoding = THREE.sRGBEncoding; }); imageUri = null; osgImage = null; imageUrl = null; if (texture) { material.map = texture; } } catch (e) { console.log('纹理加载出错', e); } osgStateSet = null; return material; } private blobToBase64(blob: any) { return new Promise((resolve, reject) => { const fileReader = new FileReader(); // readAsDataURL fileReader.readAsDataURL(blob); fileReader.onload = (e: any) => { resolve(e.target.result); }; }); }没有显示base64图片的纹理，也没有报错，请找出问题，并给出详细代码

在代码中，你使用了一个Blob对象来加载纹理图片，并将其转换成了base64编码，但是在加载纹理时，却直接使用了base64编码字符串来加载纹理，这个可能是导致问题的原因。正确的做法应该是使用图片的URL来加载纹理，而不是直接使用base64编码字符串。

具体修改代码如下：

private async parseMaterial(osgStateSet: any) {
    let material = new THREE.MeshBasicMaterial({
        // side: THREE.DoubleSide,
    });
    //THREE.FrontSide 背面
    // THREE.BackSide 前面
    // THREE.DoubleSide 双面

    let osgImage = osgStateSet.TextureAttributeList[0].value.StateAttribute.Image;
    // let texture = this.parseImage(osgImage);

    let fileName = osgImage.Name;
    const isJPEG = fileName.search(/.jpe?g($|?)/i) > 0;
    const isPNG = fileName.search(/.png($|?)/i) > 0;
    if (!isPNG && !isJPEG) {
        return;
    }
    let mimeType = isPNG ? 'image/png' : 'image/jpeg';
    let imageUri: any = new Blob([osgImage.Data], { type: mimeType });

    try {
        // 使用图片的URL来加载纹理
        let texture = await new Promise<THREE.Texture>((resolve) => {
            let imageUrl = URL.createObjectURL(imageUri);
            new THREE.TextureLoader().load(imageUrl, (texture) => {
                // 在加载完成的回调函数中，手动释放URL对象，避免内存泄漏问题
                URL.revokeObjectURL(imageUrl);
                texture.needsUpdate = true;
                // texture.format = THREE.RGBAFormat;
                texture.type = THREE.UnsignedShort5551Type;
                texture.minFilter = THREE.LinearMipmapNearestFilter;
                texture.magFilter = THREE.LinearMipmapNearestFilter;
                texture.generateMipmaps = false;
                // texture.format = THREE.RGBAIntegerFormat;
                // texture.minFilter = THREE.NearestFilter;
                // texture.magFilter = THREE.NearestFilter;
                // texture.minFilter = THREE.LinearMipMapLinearFilter;
                // texture.magFilter = THREE.LinearFilter;
                // texture.wrapS = THREE.RepeatWrapping;
                // texture.wrapT = THREE.RepeatWrapping;
                // texture.anisotropy = 1;
                // texture.generateMipmaps = false;
                // texture.encoding = THREE.sRGBEncoding;
                resolve(texture);
            });
        });

        if (texture) {
            material.map = texture;
        }
    } catch (e) {
        console.log('纹理加载出错', e);
    }
    osgStateSet = null;
    return material;
}

private blobToBase64(blob: any) {
    return new Promise((resolve, reject) => {
        const fileReader = new FileReader();
        // readAsDataURL
        fileReader.readAsDataURL(blob);
        fileReader.onload = (e: any) => {
            resolve(e.target.result);
        };
    });
}

其中，使用了一个Promise对象来等待纹理加载完成后返回，同时在加载完成的回调函数中，手动释放URL对象，避免内存泄漏问题。另外，建议在加载纹理时，设置合适的minFilter和magFilter，以获得更好的渲染效果。