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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://p26-passport.byteacctimg.com/img/user-avatar/8c252ed6dbf0b2e12aa1cb3985b7c942~180x180.awebp?");

ajax.onreadystatechange = function (){

    if(ajax.readyState==4&&ajax.status==200){

        var c = ajax.responseText;

        console.log(c)

    }

}