对象反序列化时number类型丢失精度如何解决
=======================

1.  通过[JSON.parse()](https://developer.huawei.com/consumer/cn/doc/harmonyos-references/js-apis-json#jsonparse)解析，可以通过传入options参数，指定options为bigIntMode: JSON.BigIntMode.PARSE\_AS\_BIGINT，来处理BigInt的模式。
    
    示例代码参考如下：
    
    import { JSON } from '@kit.ArkTS';
    
    let options: JSON.ParseOptions = {
      bigIntMode: JSON.BigIntMode.PARSE\_AS\_BIGINT,
    }
    let numberText = '{"largeNumber":1122333444455556666677777888889}';
    let numberObj = JSON.parse(numberText, (key: string, value: Object | undefined | null): Object | undefined | null => {
      if (key === "largeNumber") {
        return value;
      }
      return value;
    }, options) as Object;
    
    @Entry
    @Component
    struct BigIntDemo {
      @State str: string = 'bigint num';
    
      build() {
        Row() {
          Column() {
            Button(this.str)
              .onClick(() => {
                console.info((numberObj as object)?.\["largeNumber"\]); _// 1122333444455556666677777888889_
              })
          }
          .width('100%')
        }
        .height('100%')
      }
    }
    
2.  使用三方库[json-bigint](https://ohpm.openharmony.cn/#/cn/detail/@ohmos%2Fjson-bigint)处理。