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// 写文章插入图片复制地址
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=");
ajax.onreadystatechange = function (){
    if(ajax.readyState==4&&ajax.status==200){
        var c = ajax.responseText;
        console.log(c)
    }
}