Javascript从字符串中提取数字 [英] Javascript extracting number from string

问题描述

我有一堆使用jQuery从html提取的字符串.

I have a bunch of strings extracted from html using jQuery.

它们看起来像这样:

var productBeforePrice = "DKK 399,95";
var productCurrentPrice = "DKK 299,95";

我需要提取数字值才能计算出价格差异.

I need to extract the number values in order to calculate the price difference.

(所以我想出了≈

var productPriceDiff = DKK 100";

或者只是:

var productPriceDiff = 100";)

有人可以帮我吗?

谢谢， 雅各布

推荐答案

首先，您需要将输入价格从字符串转换为数字.然后减去.而且，您必须将结果转换回"DKK ###，##"格式.这两个功能应该有帮助.

First you need to convert the input prices from strings to numbers. Then subtract. And you'll have to convert the result back to "DKK ###,##" format. These two functions should help.

var priceAsFloat = function (price) {  
   return parseFloat(price.replace(/\./g, '').replace(/,/g,'.').replace(/[^\d\.]/g,''));
}

var formatPrice = function (price) {  
   return 'DKK ' + price.toString().replace(/\./g,',');
}

然后您可以执行以下操作:

Then you can do this:

var productBeforePrice = "DKK 399,95"; 
var productCurrentPrice = "DKK 299,95";
productPriceDiff = formatPrice(priceAsFloat(productBeforePrice) - priceAsFloat(productCurrentPrice));

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