javascript - 如何将 for 循环 Javascript 程序格式化为小数点后两位？

Question

我试过 DecimalFormat 和 parseFloat，都不起作用。

    var NumOfOrganisms = 2;
    var DailyIncrease = .30;
    var NumOfDays;

    console.log("Day" + '\t' + "Approximate Population");
    console.log('1' + '\t' + NumOfOrganisms);

    for(NumOfDays = 2; NumOfDays <= 10; NumOfDays++) {
      NumOfOrganisms = NumOfOrganisms + (NumOfOrganisms * DailyIncrease);
      console.log(NumOfDays + '\t' + NumOfOrganisms);
    }

Answer 1

您必须使用函数 toFixed() 来完成此操作，在内部，作为参数指定您想要的小数位数。

给你:

  var NumOfOrganisms = 2;
  var DailyIncrease = .30;
  var NumOfDays;

  console.log("Day" + '\t' + "Approximate Population");
  console.log('1' + '\t' + NumOfOrganisms);

  for (NumOfDays = 2; NumOfDays <= 10; NumOfDays++) {
      NumOfOrganisms = NumOfOrganisms + (NumOfOrganisms * DailyIncrease);
      console.log(NumOfDays + '\t' + NumOfOrganisms.toFixed(2));
  }