JavaScript XMLHttpRequest ajax 实现 表单数据上传

目录

var xhr = new XMLHttpRequest();
xhr.open("POST", url, true); // true 代表异步
var formData = new FormData(uploadForm);
xhr.send(formData);

xhr.onreadystatechange = function () {
    if (xhr.readyState == 4) {
        var result = xhr.responseText;
        console.log(result);
    }
}