jqGrid中postData追加变量参数

　　postData = {"strIds":$("#orgid").val(),"userId":$("#userId").val()};

　　现要动态传入参数,使用继承的方式$.extend(postData,{"tableName":'tab_add'})

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PS: postData["tableName"] = 'tab_add';

      移除参数：delete postData["tableName"];