Question

我在代码中使用parseFloat时，得到类型'number'的参数不可分配...错误我尝试将differenceBetweenDates键入string | number和any，将unitDateValue键入string | number和any，但错误仍然存在。

这特别令人困惑，因为当我没有在代码中设置变量时，错误说不能分配，并给我变量differenceBetweenDates。 differenceBetweenDates 下划线标注为错误，但实际上我指的是 unitDateValue ;

这是有问题的功能：

export default function processDate(): void {
  let endDateValue: any = 10;
  let startDateValue: any = 20  
  let unitDateValue: any;
  let unit = 'day';  
  let differenceBetweenDates: any;

  // diff() will return a number
  differenceBetweenDates = endDateValue.diff(startDateValue);
  if(differenceBetweenDates > 0) {
    switch (unit) {
      case 'day': {

        // ERROR: Argument of type 'number' is not assignable to parameter of type 'string';
        // ERROR: let differenceBetweenDates: any;
        unitDateValue = parseFloat( differenceBetweenDates / (1000 * 60 * 60 * 24) ).toFixed(0);

        // This works but is not what I want, I need to parseFloat
        // unitDateValue = ( differenceBetweenDates / (1000 * 60 * 60 * 24) ).toFixed(0);
        break;
      }
      case 'week': {
        // ERROR: Argument of type 'number' is not assignable to parameter of type 'string';
        // ERROR: let differenceBetweenDates: any;
        unitDateValue = parseFloat( differenceBetweenDates / (1000 * 60 * 60 * 24 * 7) ).toFixed(1);
        //Round up on .9
        let unitDateValueArray = unitDateValue.split('.');
        if(unitDateValueArray.length === 2 && unitDateValueArray[1] === '9') {
          unitDateValue = Math.round( Number(unitDateValue) );
        }
        break;
      }
    }
    console.log( Number(unitDateValue).toString() );
  }

}

Answer 1

parseFloat仅接受第一个参数中的字符串。这是错误。

由于您已经有号码，因此您无需在其上拨打praseFloat。只需括在括号中并在结果上调用.toFixed(1)。

unitDateValue = (differenceBetweenDates / (1000 * 60 * 60 * 24)).toFixed(0);

使用parseFloat时，类型'number'的参数不能分配给'string'类型的参数

1 个答案: