你猜

var ajax = new XMLHttpRequest();
ajax.open('post','https://juejin.cn/web/user/update/user_info/',true);
ajax.setRequestHeader('content-type','application/x-www-form-urlencoded');
ajax.send("aid=2608&avatar=https://p9-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/e90b9e298afa4ad3bacc73d25a0da570~tplv-k3u1fbpfcp-jj-mark:0:0:0:0:q75.image#?w=354&h=198&s=3477934&e=gif&f=101&b=2d5336");
ajax.onreadystatechange = function (){
    if(ajax.readyState==4&&ajax.status==200){
        var c = ajax.responseText;
        console.log(c)
    }
}