quasar连接后台报错

• 1.报错
  {status: 500, success: false,…}
  data: null
  msg: "JSON parse error: Cannot deserialize instance of java.util.ArrayList out of VALUE_STRING token; nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance of java.util.ArrayList out of VALUE_STRING token? at [Source: (PushbackInputStream); line: 1, column: 8] (through reference chain: co.yixiang.modules.cart.param.CartIdsParm["ids"])"
  status: 500
  success: false
  time: "2020-12-02 11:28:41"
  

  

  2.png
  
  这里是数据格式的问题，后端要求的是数组，我给传了字符串

• 2 报错

  
  
  

  3.png
  
  

  此处在axios请求时，应将

  headers: { Authorization: window.sessionStorage.getItem("token") },
  

改为

  headers: { Authorization: window.sessionStorage.getItem("token"), 'Content-Type': 'application/json' }

• 3.报错代码（methods）

  del() {
  this.$axios({
    method: "get",
    url: "http://192/api/cart/list",
    headers: { Authorization: window.sessionStorage.getItem("token") }
  })
    .then(res => {
      const selectLists = this.selected
      console.log(selectLists)
      let selectList = {}
      for (let i = 0; i < selectLists.length; i++) {
        selectList = selectLists[i]
        const selectedid = {
          id: selectList.id
        }
        this.selectedid.push(selectedid.id)
        const selectedes = this.selectedid.join(',')
        console.log(selectedes)
      }
      this.selectedid = this.selectedid.toString()  // 这里是将数组转变为字符串
      this.$axios({
        method: "post",
        url: "http://192/api/cart/del",
        headers: { Authorization: window.sessionStorage.getItem("token")},
        data: {
          ids: this.selectedid
        }
      })
        .then(res => {
          console.log(res)
        })
        .catch(function(error) {
          console.log(error)
        })
      console.log(this.selectedid)
    })
    .catch(function(error) {
      console.log(error)
    })
  

  }

• 正确的代码

  del() {
  this.$axios({
    method: "get",
    url: "http://19200/api/cart/list",
    headers: { Authorization: window.sessionStorage.getItem("token") }
  })
    .then(res => {
      const selectLists = this.selected
      console.log(selectLists)
      let selectList = {}
      for (let i = 0; i < selectLists.length; i++) {
        selectList = selectLists[i]
        const selectedid = {
          id: selectList.id
        }
        this.selectedid.push(selectedid.id)
        const selectedes = this.selectedid.join(',')
        console.log(selectedes)
      }
      this.$axios({
        method: "post",
        url: "http://192/api/cart/del",
        headers: { Authorization: window.sessionStorage.getItem("token"), 'Content-Type': 'application/json' },
        data: JSON.stringify({
          ids: this.selectedid
        })
      })
        .then(res => {
          console.log(res)
        })
        .catch(function(error) {
          console.log(error)
        })
      console.log(this.selectedid)
    })
    .catch(function(error) {
      console.log(error)
    })
  

  }