JS实现HTML表格排序功能

<table cellpadding="0" id="table">
    <tr class="">
      <td>click me</td>
      <td>click me</td>
      <td>click me</td>
      <td>click me</td>
    </tr>
    <tr>
      <td>
        <span id="bfn_la_bac.usa">15.43</span>
      </td>
      <td class="red">700</td>
      <td>1.220</td>
      <td class="red">阿</td>
    </tr>
    <tr>
      <td>
        <span id="bfn_la_c.usa">7.05</span>
      </td>
      <td class="red">4</td>
      <td>3,000</td>
      <td class="red">炳</td>
    </tr>
    <tr>
      <td>
        <span id="bfn_la_jpm.usa">30.62</span>
      </td>
      <td class="red">30</td>
      <td>2,558,800</td>
      <td class="red">和</td>
    </tr>
    <tr>
      <td>
        <span id="bfn_la_axp.usa">22.30</span>
      </td>
      <td class="red">5</td>
      <td>6</td>
      <td class="red">瞎</td>
    </tr>
    <tr>
      <td>
        <span id="bfn_la_mrk.usa">26.31</span>
      </td>
      <td class="red">0.6</td>
      <td>5</td>
      <td class="red">-</td>
    </tr>
    <tr>
      <td>
        <span id="bfn_la_pg.usa">63.16</span>
      </td>
      <td class="red">7</td>
      <td>4</td>
      <td class="red">子</td>
    </tr>
  </table>

var tableSort = function(){ 
  this.initialize.apply(this,arguments); 
} 
tableSort.prototype = { 
  initialize : function(tableId,clickRow,startRow,endRow,classUp,classDown,selectClass){ 
    this.Table = document.getElementById(tableId); 
    this.rows = this.Table.rows;//所有行 
    this.Tags = this.rows[clickRow-1].cells;//标签td 
    this.up = classUp; 
    this.down = classDown; 
    this.startRow = startRow; 
    this.selectClass = selectClass; 
    this.endRow = (endRow == 999? this.rows.length : endRow); 
    this.T2Arr = this._td2Array();//所有受影响的td的二维数组 
    this.setShow(); 
  }, 
  //设置标签切换 
  setShow:function(){ 
    var defaultClass = this.Tags[0].className; 
    for(var Tag ,i=0;Tag = this.Tags[i];i++){ 
      Tag.index = i; 
      addEventListener(Tag ,'click', Bind(Tag,statu)); 
    } 
    var _this =this; 
    var turn = 0; 
    function statu(){ 
      for(var i=0;i<_this.Tags.length;i++){ 
        _this.Tags[i].className = defaultClass; 
      } 
      if(turn==0){ 
        addClass(this,_this.down) 
        _this.startArray(0,this.index); 
        turn=1; 
      }else{ 
        addClass(this,_this.up) 
        _this.startArray(1,this.index); 
        turn=0; 
      } 
    } 
  }, 
  //设置选中列样式 
  colClassSet:function(num,cla){ 
    //得到关联到的td 
    for(var i= (this.startRow-1);i<(this.endRow);i++){ 
      for(var n=0;n<this.rows[i].cells.length;n++){ 
        removeClass(this.rows[i].cells[n],cla); 
      } 
      addClass(this.rows[i].cells[num],cla); 
    } 
  }, 
  //开始排序 num 根据第几列排序 aord 逆序还是顺序 
  startArray:function(aord,num){ 
    var afterSort = this.sortMethod(this.T2Arr,aord,num);//排序后的二维数组传到排序方法中去 
    this.array2Td(num,afterSort);//输出 
  }, 
  //将受影响的行和列转换成二维数组 
  _td2Array:function(){ 
    var arr=[]; 
      for(var i=(this.startRow-1),l=0;i<(this.endRow);i++,l++){ 
        arr[l]=[]; 
        for(var n=0;n<this.rows[i].cells.length;n++){ 
          arr[l].push(this.rows[i].cells[n].innerHTML); 
        } 
      } 
    return arr; 
  }, 
  //根据排序后的二维数组来输出相应的行和列的 innerHTML 
  array2Td:function(num,arr){ 
    this.colClassSet(num,this.selectClass); 
    for(var i= (this.startRow-1),l=0;i<(this.endRow);i++,l++){ 
      for(var n=0;n<this.Tags.length;n++){ 
        this.rows[i].cells[n].innerHTML = arr[l][n]; 
      } 
    } 
  }, 
  //传进来一个二维数组，根据二维数组的子项中的w项排序，再返回排序后的二维数组 
  sortMethod:function(arr,aord,w){ 
    arr.sort(function(a,b){ 
      x = killHTML(a[w]); 
      y = killHTML(b[w]); 
      x = x.replace(/,/g,''); 
      y = y.replace(/,/g,''); 
      switch (isNaN(x)){ 
      case false: 
      return Number(x) - Number(y); 
      break; 
      case true: 
      return x.localeCompare(y); 
      break; 
      } 
    }); 
    arr = aord==0?arr:arr.reverse(); 
    return arr; 
  } 
} 
/-----------------------------------/ 
function addEventListener(o,type,fn){ 
  if(o.attachEvent){
    o.attachEvent('on'+type,fn);
  }else if(o.addEventListener){
    o.addEventListener(type,fn,false);
  }else{
    o['on'+type] = fn;
  } 
} 
function hasClass(element, className) { 
  var reg = new RegExp('(\s|^)'+className+'(\s|$)'); 
  return element.className.match(reg); 
} 
function addClass(element, className) { 
  if (!this.hasClass(element, className)) { 
    element.className += " "+className; 
  } 
} 
function removeClass(element, className) { 
  if (hasClass(element, className)) { 
    var reg = new RegExp('(\s|^)'+className+'(\s|$)'); 
    element.className = element.className.replace(reg,' '); 
  } 
} 
var Bind = function(object, fun) { 
  return function() { 
    return fun.apply(object, arguments); 
  } 
} 
//去掉所有的html标记 
function killHTML(str){ 
  return str.replace(/<[^>]+>/g,""); 
} 
//------------------------------------------------ 
//tableid 第几行是标签行，从第几行开始排序，第几行结束排序(999表示) 升序标签样式，降序标签样式 选中列样式 
//注意标签行的class应该是一致的 
var ex1 = new tableSort('table',1,2,999,'up','down','hov');