input 输入价格

// 价格输入框  decimal: 精度

export function inputPrice(val, decimal) {

  val = val.replace(/[^\d.]/g, '') // 清除“数字”和“.”以外的字符

  val = val.replace(/\.{2,}/g, '.') // 只保留第一个. 清除多余的

  val = val

    .replace('.', '$#$')

    .replace(/\./g, '')

    .replace('$#$', '.')

  switch (decimal) {

    case 1:

      val = val.replace(/^(-)*(\d+)\.(\d{1}).*$/, '$1$2.$3')

      break

    case 2:

      val = val.replace(/^(-)*(\d+)\.(\d{2}).*$/, '$1$2.$3')

      break

    case 3:

      val = val.replace(/^(-)*(\d+)\.(\d{3}).*$/, '$1$2.$3')

      break

    case 4:

      val = val.replace(/^(-)*(\d+)\.(\d{4}).*$/, '$1$2.$3')

      break

    case 5:

      val = val.replace(/^(-)*(\d+)\.(\d{5}).*$/, '$1$2.$3')

      break

    case 6:

      val = val.replace(/^(-)*(\d+)\.(\d{6}).*$/, '$1$2.$3')

      break

    case 7:

      val = val.replace(/^(-)*(\d+)\.(\d{7}).*$/, '$1$2.$3')

      break

    case 8:

      val = val.replace(/^(-)*(\d+)\.(\d{8}).*$/, '$1$2.$3')

      break

    case 9:

      val = val.replace(/^(-)*(\d+)\.(\d{9}).*$/, '$1$2.$3')

      break

    default:

      val = val.replace(/^(-)*(\d+)\.().*$/, '$1$2.$3')

      break

  }

  // 以上已经过滤，此处控制的是如果没有小数点，首位不能为类似于 01、02的金额

  if (val.indexOf('.') < 0 && val != '') {

    if (val.length > 9) {

      val = val.substr(0, 9)

    }

    val = parseFloat(val)

  }

  return val

}