来自：http://www.ra1nker.com/99.html

清除隐藏文字的脚本，方便拷贝一些经过特别处理过的网页文字，快捷键alt+q
将以下代码保存为cleanhidemod.user.js。再增加插件

// ==UserScript==
// @name ra1nker.com// @match http://*/*
// ==/UserScript==
var debug=false; //debug or release switch!!
var CleanHideObj=new CleanHideClass();
function CleanHideClass()
{
//functions;id mean cleanhid ,AppID mean call from firefox or mozilla (different! call from overlayFF or overlayMZ!)
this.on=function(id,bMZ)
{
//this.strBundle = document.getElementById("cleanhide-strings"); //get the strings use in js!
if(id == 0)
{
var page=/* document.getElementById("content").contentDocument */document; //main page
this.RemoveHide(page,"span");
this.RemoveHide(page,"font");
this.RemoveHide(page,"div");
this.RemoveHide(page,"p");
//alert(this.strBundle.getString("CleanHideSuccess"));
//document.getElementById("statusbar-display").label=this.strBundle.getString("CleanHideSuccess");
}}
this.getobjstyle=function(node,prop)
{
try
{
return node.ownerDocument.defaultView.getComputedStyle(node, "").getPropertyValue(prop);
}
catch(e)
{
if(debug)
{
alert(e.message);
}return "200";
}
}
this.RemoveHide=function(page,objname)
{
try
{
var minValue=25;
var objs=page.getElementsByTagName(objname); //get all element

if(objs.length == 0) //no span or font object found!
{
if(debug)
{
alert("no object found!:"+objname);
}
}
else
{
//determean every object!
for(var i=objs.length-1;i>=0;i--) //must from last to first!!! for detect every element!!
{
var node=objs.item(i); //get one element

//if this object is invisible,we delete it!!
if(this.getobjstyle(node,"display") == "none" ||
this.getobjstyle(node,"visibility") =="hidden" ||
parseInt(this.getobjstyle(node,"font-size")) == 0) //if this element'style is none,than remove it!!
{
if(debug)
{
alert("remove invisiable!");
}
node.parentNode.removeChild(node);

}
else //normal object!have color!
{
if(node.parentNode) //if it has parent node!!
{
var orgNode=node;
var orgColor=this.getobjstyle(orgNode,"color");
var orgRGB=getRGB(orgColor); //get org node's RGB only color.
var parentNode=node.parentNode
var parentBgColor=this.getobjstyle(parentNode,"background-color");

var isLast=false;
regtest=/rgba\((\s)*0,(\s)*0,(\s)*0,(\s)*0\)/;
while(regtest.test(parentBgColor)) //parent bg is transparent!!,get last no transparent node!!
{

if(parentNode.parentNode == null)
{
isLast=true;
break;
}
parentNode=parentNode.parentNode;
parentBgColor=this.getobjstyle(parentNode,"background-color");
parentBgColor=parentBgColor+"";
if(!regtest.test(parentBgColor))
{

break;
}
}
if(isLast) //body is RGB(255,255,255)!!!
{
if(debug)
{
alert("last!!");
}
if((Math.abs(orgRGB[0]-255)<=minValue)&&(Math.abs(orgRGB[1]-255)<=minValue)&&(Math.abs(orgRGB[2]-255)<=minValue))
{
orgNode.parentNode.removeChild(orgNode); //color is near white,we delete it!
}
}
else
{
if(debug)
{
alert("compare color and parent bgcolor!");
}
parentBgRGB=getRGB(parentBgColor);
if((Math.abs(orgRGB[0]-parentBgRGB[0])<=minValue)&&(Math.abs(orgRGB[1]-parentBgRGB[1])<=minValue)&&(Math.abs(orgRGB[2]-parentBgRGB[2])<=minValue))
{
orgNode.parentNode.removeChild(orgNode); //color is near white,we delete it!
}
}
}//end of hava parent
}//if invisible
}//for ... every object
}//object lentgth == 0

//find sub frames
var itemFrames = page.getElementsByTagName("frame");
var itemiFrames = page.getElementsByTagName("iframe");

var frame, iframe;
if (itemFrames.length > 0)
{
for (var i = 0 ; i< itemFrames.length ; i++)
{
frame = itemFrames[i].contentDocument;
this.RemoveHide(frame,objname); // recursion for frames
}
}
if (itemiFrames.length > 0)
{
for (var i = 0 ; i < itemiFrames.length ; i++)
{
iframe = itemiFrames[i].contentDocument;
this.RemoveHide(iframe,objname); // recursion for iframes
}
}
}
catch(e)
{
if(debug)
{
alert(e.message);
}
}
}

}
//this function for get R G B data from string rgb(r,g,b) or blue,etc
function getRGB(colorString)
{
var RGB = new Array;
var tempSting=colorString.substring(4,colorString.length-1);
var tempArray=tempSting.split(",");

RGB[0]=parseInt(tempArray[0]);
RGB[1]=parseInt(tempArray[1]);
RGB[2]=parseInt(tempArray[2]);

return RGB;
}
function keys(evt)
{ //var evt=evt?evt:(window.event?window.event:null);

if(evt.keyCode == 81 && !evt.shiftKey && !evt.ctrlKey && evt.altKey)
{
CleanHideObj.on(0,1);
alert("Ra1nker：成功去除干扰码");
}

}
document.addEventListener('keydown', keys, false);