javascript - Rounding off a formatted string number using JavaScript or ExtJS

Question

Below, I have a number which I am trying to format using javascript. But it returns NaN.

var v = "153,452.47";
alert(Math.round(v));

You can use following fiddle: Example

How can we format a numeric string having separators?

Answer 1

我认为这会很好用

var v = "153,452.47";
var float = parseFloat(v.replace(/[^0-9.]/g, ''));
// => 153452.47

如果要四舍五入为整数

var v = "153,452.47";
float.toFixed(0);
// => 153452

让我们做一个不错的小功能！

var roundFormattedNumber = function(n){
  var result = parseFloat(n.replace(/[^0-9.]/g, ''));
  return isNaN(result) ? NaN : result.toFixed(0);
};

这比提供的其他解决方案效果更好，因为它是白名单正则表达式替换而不是黑名单替换。这意味着它甚至适用于像这样的数字$ 1,234.56

提供的其他解决方案不适用于这些数字

roundFormattedNumber("$ 123,456,489.00");
//=> 123456789

roundFormattedNumber("999.99 USD");
//=> 1000

roundFormattedNumber("1 000 €");
//=> 1000

roundFormattedNumber("i like bears");
//=> NaN

Answer 2

您必须删除逗号。

parseFloat("153,452.57".replace(/,/g,"")).toFixed(0);

如果你想要 2 位小数：

parseFloat("153,452.57".replace(/,/g,"")).toFixed(2);

Answer 3

尝试这个

var v = "153,452.47";
Math.round(parseFloat(v.replace(",","")));