SOURCE

// 实例化一个xhr
let xhr = new XMLHttpRequest()
// 设置请求方法和地址
xhr.open('post','http://152.136.140.56:38457')
// 设置请求头
xhr.setRequestHeader('content-type', 'application/x-www-form-urlencoded')
xhr.send('')
xhr.onreadystatechange = function(){
    // 判断是否请求成功
    if(xhr.readyState === 4 || xhr.status === 200 ){
        console.log(xhr.responseText)
    }
}