注：php后台，必须要将字符串进行 json_encode($str)处理，输出json格式的字符串中，字段和值必须都要双引号{"name":"dd","phone":"888888"}

<script>

j={};
j.name="zz";
j.phone="6666";
 j.daiLiShangID="33";
 j.daiLiShangOpenid="fff";

$.ajax({
                    url: "saveorder.php",
                    type: "POST",
                    data:j,
                    dataType:"json",
                    success: function (data) {
                        //alert(data);
                        var arr=eval("("+data+")");
                        alert(arr.phone+"_"+arr.name);        
                        
                        
                    },
                    error: function () {
                        alert("失败！");
                       
                    }
                 });

</script>

===saveorder.php====

<?php
 
$phone=$_POST["phone"];
$name=$_POST["name"];;
$reValue='{"name":"'.$name.'","phone":"'.$phone.'"}';

echo json_encode($reValue);
        ?>