1. The value of the foreground data is as follows:
var vm = new Vue({
  el: "-sharpvm",
    data: {
        offer: {
            isshow:false,
            sum_total_price:0,
            sum_discount:0,
            sum_price:0,
            children:[
            {
              type_id:"1",
              type_name:"",
              title: "",
              date: "",
              price: 0,
              number:1,
              time:1,
              total_price:0,
              discount: 0,
              other: "",
            }, {
              type_id:"2",
              type_name:"",
              title: "",
              date: "",
              price: 0,
              number:1,
              time:1,
              total_price:0,
              discount: 0,
              other: "",
            }, {
              type_id:"3",
              type_name:"",
              title: "",
              date: "",
              price: 0,
              number:1,
              time:1,
              total_price:0,
              discount: 0,
              other: "",
            }, {
              type_id:"4",
              type_name:"",
              title: "",
              date: "",
              price: 0,
              number:1,
              time:1,
              total_price:0,
              discount: 0,
              other: "",
            }, {
              type_id:"5",
              type_name:"",
              title: "",
              date: "",
              price: 0,
              number:1,
              time:1,
              total_price:0,
              discount: 0,
              other: "",
            }, {
              type_id:"6",
              type_name:"",
              title: "",
              date: "",
              price: 0,
              number:1,
              time:1,
              total_price:0,
              discount: 0,
              other: "",
            }, {
              type_id:"7",
              type_name:"",
              title: "",
              date: "",
              price: 0,
              number:1,
              time:1,
              total_price:0,
              discount: 0,
              other: "",
            }, {
              type_id:"8",
              type_name:"",
              title: "",
              date: "",
              price: 0,
              number:1,
              time:1,
              total_price:0,
              discount: 0,
              other: "",
            }, {
              type_id:"9",
              type_name:"",
              title: "",
              date: "",
              price: 0,
              number:1,
              time:1,
              total_price:0,
              discount: 0,
              other: "",
            }, {
              type_id:"10",
              type_name:"",
              title: "",
              date: "",
              price: 0,
              number:1,
              time:1,
              total_price:0,
              discount: 0,
              other: "",
            }, {
              type_id:"11",
              type_name:"",
              title: "",
              date: "",
              price: 0,
              number:1,
              time:1,
              total_price:0,
              discount: 0,
              other: "",
            }, {
              type_id:"12",
              type_name:"",
              title: "",
              date: "",
              price: 0,
              number:1,
              time:1,
              total_price:0,
              discount: 0,
              other: "",
            }, {
              type_id:"13",
              type_name:"",
              title: "",
              date: "",
              price: 0,
              number:1,
              time:1,
              total_price:0,
              discount: 0,
              other: "",
            }, {
              type_id:"14",
              type_name:"",
              title: "",
              date: "",
              price: 0,
              number:1,
              time:1,
              total_price:0,
              discount: 0,
              other: "",
            }, {
              type_id:"15",
              type_name:"",
              title: "",
              date: "",
              price: 0,
              number:1,
              time:1,
              total_price:0,
              discount: 0,
              other: "",
            }
            ]
        },
        title:"",
        date:"2018-12-12",
        adult:"0",
        children:"0",
        gocity:"",
        tocity:"",
        special:"",
        tour:[
                {title:"",isshow:false,children:[
                    {title:"",type:1,other:"",children:[
                        {flight_number:"",flight_space:"1",start_time:"",start_airport:"",start_terminal:"",end_time:"",end_airport:"",end_terminal:"",stop_city:"",stop_hour:"",stop_minute:"",overnight:""},
                        {flight_number:"",flight_space:"1",start_time:"",start_airport:"",start_terminal:"",end_time:"",end_airport:"",end_terminal:"",stop_city:"",stop_hour:"",stop_minute:"",overnight:""}
                    ]},
                    {title:"",type:2,other:"",children:[
                        {sight_name:"",sight_id:"",img:""},
                        {sight_name:"",sight_id:"",img:""}
                    ]},
                    {title:"",type:3,other:"",children:[
                        {hotel_name:"",hotel_id:"",img:""},
                        {hotel_name:"",hotel_id:"",img:""}
                    ]},
                    {title:"",type:4,meal:1,other:"",children:[
                        {cater_name:"",cater_id:"",img:""},
                        {cater_name:"",cater_id:"",img:""}
                    ]},
                    {title:"",type:5,other:""},
                    {title:"",type:6,other:""}
                ]}
            ]
    }
})2. The axios file is also introduced into the page:
<script src="https://unpkg.com/axios/dist/axios.min.js"></script>3. The test submission code is as follows:
        axios.post("{:url("api/plan/save")}", {
             firstName: "Fred",
             lastName: "Flintstone"
        })
        .then(function (response) {
            console.log(response);
        })
        .catch(function (error) {
            console.log(error);
        }); 4. The data is passed by post, with a status of 2000, but the backend php $_ POST cannot get the data from post. What do I need to do? 
 and how do you operate if you post all the values in data? 
  add:  
  added another Qs file  
JS
<script src="https://unpkg.com/axios/dist/axios.min.js"></script>
<script src="https://cdn.bootcss.com/qs/6.5.2/qs.min.js"></script>
//post
    let postData={
        title:vm.title,
        date:vm.date,
        adult:vm.adult,
        children:vm.children,
        gocity:vm.gocity,
        tocity:vm.tocity
    }
    axios.post("{:url("api/plan/save")}",Qs.stringify(postData))
    .then(function (response) {
        console.log(response);
    })
    .catch(function (error) {
        console.log(error);
    });
//php$_POST
array (size=6)
  "title" => string "" (length=6)
  "date" => string "2018-12-12" (length=10)
  "adult" => string "0" (length=1)
  "children" => string "0" (length=1)
  "gocity" => string "" (length=6)
  "tocity" => string "" (length=6)
//chrome
array (size=6)
  "title" => string "" (length=6)
  "date" => string "2018-12-12" (length=10)
  "adult" => string "0" (length=1)
  "children" => string "0" (length=1)
  "gocity" => string "" (length=6)
  "tocity" => string "" (length=6)  in addition, how do you give the entire data value of vue to post like postData?  
 at present, you just correspond to the value of data, concatenate it to postData, and then post it. 
