jquery datatable 排序问题

jQuery.fn.dataTableExt.oSort['numeric-comma-asc']  = function(a,b) { 
        a = a.replace(/[ ]/g,"") 
        b = b.replace(/[ ]/g,"") 


        if(a.indexOf(",") != -1){a = a.replace(/\,/g, "")} 
        if(b.indexOf(",") != -1){b = b.replace(/\,/g, "")} 
        if(a.indexOf("'") != -1){a = a.replace(/\'/g, "")} 
        if(b.indexOf("'") != -1){b = b.replace(/\'/g, "")} 
        if(a.indexOf(" ") != -1){a = a.replace(/ /g, "")} 
        if(b.indexOf(" ") != -1){b = b.replace(/ /g, "")} 


        var a1 = a.slice(0,3) 
        var a2 = a.slice(3) 
        var b1 = b.slice(0,3) 
        var b2 = b.slice(3) 
        return ((a1 < b1) ? -1 : ((a1 > b1) ?  1 : (parseFloat(a2) < parseFloat(b2)) ? -1 : (parseFloat(a2) > parseFloat(b2)) ? 1 : 0)) 
    };


jQuery.fn.dataTableExt.oSort['numeric-comma-desc']  = function(a,b) {
        a = a.replace(/[ ]/g,"")
        b = b.replace(/[ ]/g,"")


        if(a.indexOf(",") != -1){a = a.replace(/\,/g, "")}
        if(b.indexOf(",") != -1){b = b.replace(/\,/g, "")}
        if(a.indexOf("'") != -1){a = a.replace(/\'/g, "")}
        if(b.indexOf("'") != -1){b = b.replace(/\'/g, "")}
        if(a.indexOf("&nbsp;") != -1){a = a.replace(/&nbsp;/g, "")}
        if(b.indexOf("&nbsp;") != -1){b = b.replace(/&nbsp;/g, "")}


        var a1 = a.slice(0,3)
        var a2 = a.slice(3)
        var b1 = b.slice(0,3)
        var b2 = b.slice(3)
        return ((a1 < b1) ? 1 : ((a1 > b1) ?  -1 : (parseFloat(a2) < parseFloat(b2)) ? 1 : (parseFloat(a2) > parseFloat(b2)) ? -1 : 0))
};
// 以上是我自定义的排序方法

//这里开始初始化
$('#example').dataTable({

    'aoColumns': [
    {'sTitle':'Counter part'},
    {'sTitle':'Type'},
    {'sTitle':'Amount',  'sType': 'numeric-comma'},  //这里指定那一列使用自定义排序方法
    {'sTitle':'Converted amount', 'sType': 'numeric-comma'},
    {'sTitle':'All in amount', 'sType': 'numeric-comma'},
    {'sTitle':'All-in rate'},
    {'sTitle':"Bank's all-in rate"},
    {'sTitle':'Trade date'},
    {'sTitle':'Value date'},
    {'sTitle':'Reference'},
    {'sTitle':'Status'}
];

});