ajax将&特殊字符传到后台

var dataStr ='a=123&b=11&abc';

$.ajax({

url:"<%=path%>/Check/add.do",
type:"POST",
dataType:"JSON",
data:dataStr,
//traditional:true,
success:function(data){
$('#datashow').datagrid("reload");
$('#addWindow').window("close");
alert(data.msg)
},
error:function(data){
alert(data.msg)
}

})

此种写法将会传3个参数a,b,abc.要想传a=123和b=11&abc两个参数，应写成 var dataStr ={'a':'123','b':'11&abc'};后台接收方法几乎一样