fix vuejs#541 currency filter for negative numbers

src/filters/index.js

@@ -52,13 +52,14 @@ exports.currency = function (value, sign) {
  value = parseFloat(value)
  if (!value && value !== 0) return ''
  sign = sign || '$'
- var s = Math.floor(value).toString(),
+ var s = Math.floor(Math.abs(value)).toString(),
  i = s.length % 3,
  h = i > 0
  ? (s.slice(0, i) + (s.length > 3 ? ',' : ''))
  : '',
  f = '.' + value.toFixed(2).slice(-2)
- return sign + h + s.slice(i).replace(digitsRE, '$1,') + f
+ return (value < 0 ? '-' : '') +
+ sign + h + s.slice(i).replace(digitsRE, '$1,') + f
 }
 
 /**

test/unit/specs/filters_spec.js

@@ -58,6 +58,10 @@ describe('Filters', function () {
  expect(filter(false)).toBe('')
  expect(filter(null)).toBe('')
  expect(filter(undefined)).toBe('')
+ // negative numbers
+ expect(filter(-50)).toBe('-$50.00')
+ expect(filter(-150.43)).toBe('-$150.43')
+ expect(filter(-1500.4343434)).toBe('-$1,500.43')
  })
 
  it('key', function () {