HarmonyOS 如何对数组进行深拷贝？

export class MyClassUtil { 
  public static deepCopy(obj: any): any { 
    if (typeof obj !== "object" || obj === null) { 
      return obj; 
    } 
    let copy: any; 
    if (Array.isArray(obj)) { 
      copy = []; 
      for (let i = 0; i < obj.length; i++) { 
        copy[i] = this.deepCopy(obj[i]); 
      } 
    } else { 
      copy = {}; 
      for (let key in obj) { 
        if (obj.hasOwnProperty(key)) { 
          copy[key] = this.deepCopy(obj[key]); 
        } 
      } 
    } 
    return copy; 
  } 
}