假设我在本地数据中有两列jqGrid，其中一name列，另一date列。列中可以有重复项name。我想要的是，当我对名称列进行排序时，它会被排序，但是对于重复项，日期列将进行二次排序。
例如，假设数据看起来像：
Date Name
1/2/2013 EBC
1/3/2013 BBC
2/4/2013 EBC
3/2/2013 BBC
4/3/2013 ABC
4/2/2013 ABC
我希望它被排序为：
Date Name
4/2/2013 ABC
4/3/2013 ABC
1/3/2013 BBC
3/2/2013 BBC
1/2/2013 EBC
2/4/2013 EBC
您可以在哪里看到日期也已排序。相反，当我现在排序时，我看到的是这样的：
我的 colModels 很简单：
{
name : 'ymd',
index : 'ymd',
width : 90,
sorttype : "date",
align : 'center',
search : true
},
{
name : 'placement_inv_code',
index : 'placement_inv_code',
width : 80,
align : 'center',
search : true
}
无论如何，当我用本地数据初始化时，有没有一种简单的方法来进行这种排序？
数据样本：
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