ArkTS中如何实现对象的深拷贝？

HarmonyOS

zbw_apple

3天前

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FengTianYa

目前HarmonyOS没有直接进行深浅拷贝操作的api

1：使用三方库： https://ohpm.openharmony.cn/#/cn/detail/@wolfx%2Flodash

2：根据具体使用手写；

3：json.parse(json.stringify(obj)

具体demo如下：

import _ from '@wolfx/lodash'; 
export class AddForm { 
  id: string = ''; 
  title: string = ''; 
} 
 
@Entry 
@Component 
struct deepcopy { 
  @State text: string = "" 
  // loodash.cloneDeep(obj)深拷贝 
  @State addForm: AddForm = { id: '小王', title: "100" } 
 
  build() { 
    Column({ space: 20 }) { 
      Button("hello") 
        .onClick(() => { 
          let a: ESObject = deepCopy([1, 4, 7]) 
          console.log("mydeepCopy>>>" + a.toString()) 
        }) 
      Button("深拷贝") 
        .onClick(() => { 
          let form = _.cloneDeep(this.addForm)//使用cloneDeep方法实现深拷贝 
          form.id = "改变"; 
          console.info(`原：${JSON.stringify(this.addForm)}-----拷贝${JSON.stringify(form)}`) 
        }) 
      Button("浅拷贝") 
        .onClick(() => { 
          let form =this.addForm 
          form.id = "改变"; 
          console.info(`原：${JSON.stringify(this.addForm)}-----拷贝${JSON.stringify(form)}`) 
        }) 
    } 
  } 
} 
 
function deepCopy(obj: ESObject): ESObject { 
  if (typeof obj !== "object" || obj === null) { 
    return obj; 
  } 
  let copy: ESObject; 
  if (Array.isArray(obj)) { 
    copy = []; 
    for (let i = 0; i < obj.length; i++) { 
      copy[i] = deepCopy(obj[i]); 
    } 
  } else { 
    copy = {}; 
    for (let i = 0; i < obj.length(); i++) { 
      let key: ESObject = obj[i]; 
      if (obj.hasOwnProperty(key)) { 
        copy[key] = deepCopy(obj[key]); 
      } 
    } 
  } 
  return copy; 
}