jQuery DataTables插件 aoColumnDefs和aoColumns的用法
aoColumnDefs : [ { "aTargets" :　[1], "mRender" : function(data, type, full){ return 100; } }, { "aTargets" :　["_all"], "mRender" : function(data, type, full){ return 200; } }]

?

则aTargets是1的设置的优先级高。

如果写成：

aoColumnDefs : [    {        "aTargets" :　["_all"],        "mRender" : function(data, type, full){            return 200;        }    },    {        "aTargets" :　[1],        "mRender" : function(data, type, full){            return 100;        }    }]

?则aTargets是"_all"的优先级高