Extjs 中文排序 重写applySort方法

//中文排序
Ext.data.Store.prototype.applySort = function(){
 if(this.sortInfo && !this.remoteSort){
  var s=this.sortInfo,f = s.field;
  var st = this.fields.get(f).sortType;
  var fn = function(r1,r2){
    var v1 = st(r1.data[f]), v2 = st(r2.data[f]);
    if(typeof(v1) == 'string'){
     return v1.localeCompare(v2);
     }
      return v1 > v2 ? 1 : (v1 < v2 ? -1 : 0);
  };
  this.data.sort(s.direction,fn);
  if(this.snapshot && this.snapshot != this.data) {
    this.snapshot.sort(s.direction,fn);
  }
 }
}