固定 V2EX 的导航栏， 双击导航栏页面回到顶部，每日自动签到。

V2EX.user.js

// ==UserScript==
// @author        iParanoid
// @name          V2EX_User_Script
// @namespace     https://zone-huangxc.rhcloud.com
// @description   Position fixed the navigation , Scroll to top when double click navigation bar or Page Footer
// @include       *
// @updateURL https://gist.github.com/paranoidxc/5065236/raw/10bc3ee7501b86f2e579657ef64348e642cc2a70/V2EX.user.js
// ==/UserScript==

function iparanoid_wrapper() {
  $('document').ready(function(){
    function scrolltoTop() {
       $("html, body").animate({ scrollTop: 0 }, "slow");
    }
    $('#Wrapper').css({"margin-top":45});
    $('#Top').css({"position":"fixed",'margin':'auto','width':'100%','top':0}).dblclick(scrolltoTop);
    $('#Bottom').dblclick(scrolltoTop);
    
    // daily mission 
    var daily_link = $("div.inner a[href='/mission/daily']");
    if( daily_link.length ) {     
      $.ajax({
        type:'get',
        url: location.protocol+'//'+location.host+'/mission/daily',                
        success:function(html){ 
          var url = $(html).find('.box .cell>input').attr('onclick');
          var urls = url.split('=')
          url = (urls[1]+'='+urls[2]).replace(/\'/g,'').replace(' ','');
          $.ajax({
            type:'get',
            url: location.protocol+'//'+location.host+url,
            success:function(html){     
              daily_link.parent().parent().slideUp();
            },error:function(){
              alert('submit daily misson error');
            }
          })
        },
        error:function(){
          alert('get daily misson error');
        }
      });
    }
    
    
  });
};

var script = document.createElement('script');
script.id = "iparanoid_script";
if (location.host == "www.v2ex.com" || location.host == "v2ex.com") {
  script.appendChild(document.createTextNode('('+ iparanoid_wrapper +')();'));
  (document.body || document.head || document.documentElement).appendChild(script);
}