{"__config__":{"label":"FName","labelWidth":null,"showLabel":true,"tag":"el-input","iotKey":"input","tagIcon":"icon-ym icon-ym-generator-input","defaultValue":"","required":true,"layout":"colFormItem","span":24,"trigger":"blur","regList":[],"formId":111,"renderKey":1649230907391,"submenu":"机构名称"},"__slot__":{"prepend":"","append":""},"placeholder":"请输入FName","style":{"width":"100%"},"clearable":true,"readonly":false,"disabled":false,"prefix-icon":"","suffix-icon":"","maxlength":null,"show-word-limit":false,"type":"text","__expand__":{"visiable":true,"formEditShow":true,"formAddShow":true,"formDetailShow":true,"tableRowShow":true,"tableCopy":true,"tableFixed":"","tableAlign":"left","listWidth":150,"inquire":3,"labelColor":null,"topic":"","group":""},"__vModel__":"FName"}

好的，这是一个符合JSON格式的字符串，可以通过JSON.parse()方法将其转换为JSON对象。具体的代码如下：

const jsonString = '{"__config__":{"label":"FName","labelWidth":null,"showLabel":true,"tag":"el-input","iotKey":"input","tagIcon":"icon-ym icon-ym-generator-input","defaultValue":"","required":true,"layout":"colFormItem","span":24,"trigger":"blur","regList":[],"formId":111,"renderKey":1649230907391,"submenu":"机构名称"},"__slot__":{"prepend":"","append":""},"placeholder":"请输入FName","style":{"width":"100%"},"clearable":true,"readonly":false,"disabled":false,"prefix-icon":"","suffix-icon":"","maxlength":null,"show-word-limit":false,"type":"text","__expand__":{"visiable":true,"formEditShow":true,"formAddShow":true,"formDetailShow":true,"tableRowShow":true,"tableCopy":true,"tableFixed":"","tableAlign":"left","listWidth":150,"inquire":3,"labelColor":null,"topic":"","group":""},"__vModel__":"FName"}';
const jsonObj = JSON.parse(jsonString);
console.log(jsonObj);

输出的结果如下：

{
  __config__: {
    label: 'FName',
    labelWidth: null,
    showLabel: true,
    tag: 'el-input',
    iotKey: 'input',
    tagIcon: 'icon-ym icon-ym-generator-input',
    defaultValue: '',
    required: true,
    layout: 'colFormItem',
    span: 24,
    trigger: 'blur',
    regList: [],
    formId: 111,
    renderKey: 1649230907391,
    submenu: '机构名称'
  },
  __slot__: { prepend: '', append: '' },
  placeholder: '请输入FName',
  style: { width: '100%' },
  clearable: true,
  readonly: false,
  disabled: false,
  'prefix-icon': '',
  'suffix-icon': '',
  maxlength: null,
  'show-word-limit': false,
  type: 'text',
  __expand__: {
    visiable: true,
    formEditShow: true,
    formAddShow: true,
    formDetailShow: true,
    tableRowShow: true,
    tableCopy: true,
    tableFixed: '',
    tableAlign: 'left',
    listWidth: 150,
    inquire: 3,
    labelColor: null,
    topic: '',
    group: ''
  },
  __vModel__: 'FName'
}