AJAX---使用fetch函数发送AJAX请求

        const btn = document.querySelector('button');

        btn.onclick = function(){
            fetch('http://127.0.0.1:8000/fetch-server?vip=10', {
                //请求方法
                method: 'POST',
                //请求头
                headers: {
                    name:'atguigu'
                },
                //请求体
                body: 'username=admin&password=admin'
            }).then(response => {
                // return response.text();
                return response.json();
            }).then(response=>{
                console.log(response);
            });
        }