Method clearPropValue

packages/designer/src/document/node/node.ts:842–844

* 清除已设置的值

(path: string)

   * 清除已设置的值
   */
  clearPropValue(path: string): void {
    this.getProp(path, false)?.unset();
  }

  /**
   * 设置多个属性值，和原有值合并