FormData();用get打印有数据，在network中入参为空

const imageMsg= fileList[0] ? fileList[0].originFileObj || '' : ''
let formdata=new FormData;
formdata.append("classImg",imageMsg);
console.log(formdata.get("classImg"));
console.log(formdata)

在控制台打印有值，请求借口入参时为空

那打印form1呢看看