JScript String 对象自定义方法

<script language="jscript">
// 2004-12-14 @ SLIGHTBOY
// Public String PadLeft 方法
String.prototype.PadLeft = function(totalWidth, paddingChar)
{
 if ( paddingChar != null )
 {
  return this.PadHelper(totalWidth, paddingChar, false);
 } else {
  return this.PadHelper(totalWidth, ' ', false);
 }
}
// Public String PadRight 方法
String.prototype.PadRight = function(totalWidth, paddingChar)
{
 if ( paddingChar != null )
 {
  return this.PadHelper(totalWidth, paddingChar, true);
 } else {
  return this.PadHelper(totalWidth, ' ', true);
 }
 
}
// Private String PadHelper 方法(内部调用)
String.prototype.PadHelper = function(totalWidth, paddingChar, isRightPadded)
{

 if ( this.length < totalWidth)
 {
  var paddingString = new String();
  for ( var i = 1; i <= (totalWidth - this.length); i++ )
  {
   paddingString += paddingChar;
  }

  if ( isRightPadded )
  {
   return (this + paddingString);
  } else {
   return (paddingString + this);
  }
 } else {
  return this;
 }
}
// Public String Split 方法
String.prototype.Split = function(length, separator)
{
 if ( this.length > length )
 {
  var SplitCount = Math.ceil(this.length/length)
  var SplitArray = new Array(SplitCount);
  for ( var i = 0; i < SplitCount; i++ )
  {
   SplitArray[i] = this.substr( i * length, length )
  }
  return SplitArray.join(separator);
 } else {
  return this;
 }
}

var newid = "1".PadLeft(12,"0")
document.write(newid.Split(2,"/"));
</script>