javascript - parseFloat() 从字符串的中间开始

Question

当我想从“Sometext 330”这样的字符串中“parseInt或parseFloat”时，我总是有一个“NaN”

Var a = "Sometext 330"
return parseFloat(a);

它将返回“NaN”，但我需要整数或 float 330

Answer 1

您可以先清理字符串，以便在解析数字之前字符串中仅保留数字。

edit: now it's even safer as it will accept Number types without blowing up.

var a = "Sometext 330"

function safeParseFloat(val) {
  return parseFloat(isNaN(val) ? val.replace(/[^\d\.]+/g, '') : val)
}

function superSafeParseFloat(val) {
  if (isNaN(val)) {
    if ((val = val.match(/([0-9\.,]+\d)/g))) {
      val = val[0].replace(/[^\d\.]+/g, '')
    }
  }
  return parseFloat(val)
}

console.log(
  safeParseFloat(a),
  safeParseFloat(2000.69)
)

console.log(
  superSafeParseFloat('blah $2,000,000.69 AUD'),
  superSafeParseFloat('blah $8008 USD'),
  superSafeParseFloat('NotANumber'),
  superSafeParseFloat(8008.69),
  superSafeParseFloat('... something 500.5... test')
)