Question

我的代码

  var bills = [50.23, 19.12, 34.01, 100.11, 12.15, 9.90, 
               29.11, 12.99,10.00, 99.22, 102.20, 100.10, 6.77, 2.22 ];

  var totals = bills.map(function(tip){
     tip += 15/100;
     tip = tip.toFixed(2);
     return tip;
  });
  console.log(totals);

返回

  [ '50.38', '19.27', '34.16', '100.26', '12.30', '10.05', 
   '29.26', '13.14', '10.15', '99.37', '102.35', '100.25', '6.92', '2.37' ]

现在，如何将此字符串数组转换为数字数组

  [ 50.38,  19.27, 34.16, 100.26, 12.30, 10.05, 
   29.26, 13.14, 10.15, 99.37, 102.35, 100.25, 6.92, 2.37 ]

Answer 1

强制返回值到Number，替换

return tip;

一元加 +

return +tip;

或 Number构造函数

return Number(tip);

您可以将代码缩短为

var totals = bills.map( tip => +( tip + 15/100 ).toFixed( 2 ) );

Answer 2

您可以遍历数组并使用parseFloat（）函数。

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/parseFloat

JavaScript ---＆gt;如何将字符串数组转换为数字数组？

2 个答案: