NumberValidator通过exceedsMaxError，lowerThanMinError分别设置大于最大值，小于最小值的提示信息

NumberValidator通过exceedsMaxError，lowerThanMinError分别设置大于最大值，小于最小值的提示信息
The <mx:NumberValidator> tag inherits all of the tag attributes of its superclass, and adds the following tag attributes:

  <mx:NumberValidator
    allowNegative="true|false"
    decimalPointCountError="The decimal separator can only occur once."
    decimalSeparator="."
    domain="real|int"
    exceedsMaxError="The number entered is too large."
    integerError="The number must be an integer."
    invalidCharError="The input contains invalid characters."
    invalidFormatCharsError="One of the formatting parameters is invalid."
    lowerThanMinError="The amount entered is too small."
    maxValue="NaN"
    minValue="NaN"
    negativeError="The amount may not be negative."
    precision="-1"
    precisionError="The amount entered has too many digits beyond the decimal point."
    separationError="The thousands separator must be followed by three digits."
    thousandsSeparator=","
  />