[{ "nameEng": "current", "nameChn": "电流", "children": [{ "nameEng": "phaseCurrentA", "nameChn": "相电流la", "children": null }, { "nameEng": "phaseCurrentB", "nameChn": "相电流lb", "children": null }, { "nameEng": "phaseCurrentC", "nameChn": "相电流lc", "children": null } ] }, { "nameEng": "lineVoltage", "nameChn": "线电压", "children": [{ "nameEng": "lineVoltageAb", "nameChn": "线电压Uab", "children": null }] }, { "nameEng": "frequency", "nameChn": "频率", "children": [{ "nameEng": "systemFrequency", "nameChn": "系统频率F", "children": null }] }, { "nameEng": "powerFactor", "nameChn": "功率因素", "children": [{ "nameEng": "powerFactorPb", "nameChn": "分相功率因数Pfb", "children": null }, { "nameEng": "powerFactorPc", "nameChn": "分相功率因数Pfc", "children": null } ] }, { "nameEng": "systemActivePower", "nameChn": "系统有功功率", "children": [{ "nameEng": "systemActivePowerP", "nameChn": "系统有功功率Psum", "children": null }] }, { "nameEng": "positiveActivePower", "nameChn": "总正向有功电度", "children": [{ "nameEng": "totalPositiveActivePower", "nameChn": "总正向有功电度 kWh", "children": null }] } ]这样的数组中我想用js的方法获取nameEn为‘powerFactorPb‘并返回这个对象’’

你可以使用数组的 `find` 方法来获取 `nameEng` 为 'powerFactorPb' 的对象，然后返回该对象。以下是示例代码：

const data = [
  {
    "nameEng": "current",
    "nameChn": "电流",
    "children": [
      {
        "nameEng": "phaseCurrentA",
        "nameChn": "相电流la",
        "children": null
      },
      {
        "nameEng": "phaseCurrentB",
        "nameChn": "相电流lb",
        "children": null
      },
      {
        "nameEng": "phaseCurrentC",
        "nameChn": "相电流lc",
        "children": null
      }
    ]
  },
  {
    "nameEng": "lineVoltage",
    "nameChn": "线电压",
    "children": [
      {
        "nameEng": "lineVoltageAb",
        "nameChn": "线电压Uab",
        "children": null
      }
    ]
  },
  {
    "nameEng": "frequency",
    "nameChn": "频率",
    "children": [
      {
        "nameEng": "systemFrequency",
        "nameChn": "系统频率F",
        "children": null
      }
    ]
  },
  {
    "nameEng": "powerFactor",
    "nameChn": "功率因素",
    "children": [
      {
        "nameEng": "powerFactorPb",
        "nameChn": "分相功率因数Pfb",
        "children": null
      },
      {
        "nameEng": "powerFactorPc",
        "nameChn": "分相功率因数Pfc",
        "children": null
      }
    ]
  },
  {
    "nameEng": "systemActivePower",
    "nameChn": "系统有功功率",
    "children": [
      {
        "nameEng": "systemActivePowerP",
        "nameChn": "系统有功功率Psum",
        "children": null
      }
    ]
  },
  {
    "nameEng": "positiveActivePower",
    "nameChn": "总正向有功电度",
    "children": [
      {
        "nameEng": "totalPositiveActivePower",
        "nameChn": "总正向有功电度 kWh",
        "children": null
      }
    ]
  }
];

const powerFactorPbObj = data.find(obj => obj.nameEng === 'powerFactorPb');

console.log(powerFactorPbObj);

输出结果应该为：

{
  "nameEng": "powerFactorPb",
  "nameChn": "分相功率因数Pfb",
  "children": null
}