JS清除字符串中重复值的实现方法

/// <summary>
/// 清除字符串中重复的值
/// </summary>
/// <param name="Text">字符串</param>
/// <param name="Label">标签（如：| ,）</param>
function FilterRepeatStr(Text, Label) {
  var sarr = Text.split('' + Label + '');
  var idx = new Array();
  var tmp = new Array();
  var result = cm = '';
  for (var i = 0; i < sarr.length; i++) {
    sch = sarr[i].substr(0, 4);
    if (!In_Array(sch, tmp)) {
      idx[idx.length] = i;
      tmp[tmp.length] = sch;
    } else {
      idx[In_Array(sch, tmp) - 1] = i;
    }
  }
  for (var j = 0; j < idx.length; j++) {
    result += cm + sarr[idx[j]];
    cm = '' + Label + '';
  }
  return result;
//  alert('要理的字符串：' + Text);
//  alert('结果：' + result);
}
function In_Array(need, arr) {
  for (var i = 0; i < arr.length; i++) {
    if (arr[i] == need) return (i + 1);
  }
  return false;
}