multipart/form-data：FormData
var formdata = new FormData();
formdata.append("name", "xxx");
formdata.append("appKey", "xxx");
formdata.append("password", "xxx");
var requestOptions = {
method: 'POST',
body: formdata,
redirect: 'follow'
};
fetch("xxxx", requestOptions)
.then(response => response.json())
.then(result => console.log(result))
.catch(error => console.log('error', error));
