Ext中文排序

重写Ext的排序。

Ext.data.Store.prototype.applySort = function() {
	if (this.sortInfo && !this.remoteSort) {
		var s = this.sortInfo;
		var f = s.field;
		var st = this.fields.get(f).sortType;
		var fn = function(r1, r2) {
			var v1 = st(r1.data[f]);
			var 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);
		}
	}
};