imgSubmit(id) {
      axios({
        method: 'get',
        url: `${process.env.VUE_APP_BASE_API}/ranking/GetRankEveryImage`,
        responseType: 'arraybuffer',
        headers: { 'Authorization': 'Bearer ' + getToken() },
        params: {
          id: id
        }
      }).then(res => {
        var src = 'data:image/jpg;base64,' + btoa(new Uint8Array(res.data).reduce((data, byte) => data + String.fromCharCode(byte), ''))
        this.srcImg = src // 图片回显
        var link = document.createElement('a')
        link.href = src
        link.download = '排行榜.jpg'
        link.click()
      })
    },