proxyTable: {
   '/api': {
      target: 'http://192.168.48.239:8080/ydzl',
      changeOrigin: true,
      pathRewrite: {
        '^/api': ''
      }
   }

Vue.prototype.HOST = '/api'

transformRequest: [function (data) {
          // Do whatever you want to transform the data
            let ret = ''
            for (let it in data) {
             ret += encodeURIComponent(it) + '=' + encodeURIComponent(data[it]) + '&'
            }
            return ret
           }],

headers: {
            'Content-Type': 'application/x-www-form-urlencoded'
          }