【图】javascript实现划词标记划词搜索功能

　　完整示例代码如下：

　　以下是引用片段：

!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
html
head
titleUntitled Document/title
meta http-equiv="Content-Type" content="text/html; charset=gb2312"
/head
body

SCRIPT language=javascript
!--
document.body.onload=adddiv;
document.onmousedown=recordobj;
document.ondblclick=dbclick;
document.onmouseup=showselect;
var starobj,isdb=false,allow=true;
function isallow()
{
if(allow){
allow=false;
alert('is closed');
}
else{
allow=true;
alert('is opend');
}
}
function dbclick()
{
isdb=true;
}
function recordobj()
{
starobj=event.srcElement;
}
function showselect() {
var str="";
if(event.srcElement.tagName!="A"&&event.srcElement.tagName!="INPUT"&&event.srcElement==starobj&&!isdb&&allow)
{
var oText=document.selection.createRange();
if(oText.text.length0)
{
str=oText.text;
oText.text="BuB"+oText.text+"EuE";
}

oText.select();
event.srcElement.innerHTML=event.srcElement.innerHTML.replace("BuB","u style='FONT-WEIGHT: bold;COLOR: #ff3366'").replace("EuE","/u");
}
searchgoogle(str)
isdb=false;
}
function searchgoogle(str)
{
var obj=document.getElementById("searchgoogle");
if(str.length0)
{
obj.style.display="block";
obj.style.position="absolute";
obj.style.zindex=999;
obj.style.posTop=document.body.scrollTop+event.y-25;
obj.style.posLeft=document.body.scrollLeft+event.x+5;
obj.style.widht=80;
obj.innerHTML ="a target=_blank href=http://www.google.com/search？ie=UTF-8&oe=UTF -8&q="+str+" style='BORDER-RIGHT: royalblue thin solid; BORDER-TOP: royalblue thin solid; FONT-WEIGHT: bold; BORDER-LEFT: royalblue thin solid; CLIP: rect(auto auto auto auto); COLOR: #ffffff; BORDER-BOTTOM: royalblue thin solid; BACKGROUND-COLOR: inactivecaption; TEXT-DECORATION: none'Search It！/a";
}
else
{
obj.style.display="none";
}
}
function adddiv()
{
var mobj = document.createElement("div");
mobj.id="searchgoogle";
document.body.appendChild(mobj);
}
//--
/SCRIPT
INPUT type="button" onclick="isallow()" value="关闭/打开划词功能"
pqrasfdasfasfdasfsafasdfsafsafasdfasdfasd/p
/body
/html