官方文档没有说, 但是编译v-model时, 是有model这个选项的, 例如:

_c('el-input', {    attrs: {      "placeholder": "手机号或身份证号"    },    model: {      value: (_vm.formData.username),      callback: function($$v) {        _vm.formData.username = (typeof $$v === 'string' ? $$v.trim() : $$v)      },      expression: "formData.username"    }  })