JavaScript 选中文字并响应获取的实现代码

select(document, tanchu);
/*=select[[
*
* 跨浏览器选中文字事件
* @param
* object o 响应选中事件的DOM对象，required
* function fn(sText,target,mouseP)选中文字非空时的回调函数，required
* |-@param
* |-sText 选中的文字内容
* |-target 触发mouseup事件的元素
* |-mouseP 触发mouseup事件时鼠标坐标
*/
function select(o, fn){
o.onmouseup = function(e){
var event = window.event || e;
var target = event.srcElement ? event.srcElement : event.target;
if (/input|textarea/i.test(target.tagName) && /firefox/i.test(navigator.userAgent)) {
//Firefox在文本框内选择文字
var staIndex=target.selectionStart;
var endIndex=target.selectionEnd;
if(staIndex!=endIndex){
var sText=target.value.substring(staIndex,endIndex);
fn(sText,target);
}
}
else{
//获取选中文字
var sText = document.selection == undefined ? document.getSelection().toString():document.selection.createRange().text;
if (sText != "") {
//将参数传入回调函数fn
fn(sText, target);
}
}
}
}
/*]]select=*/
function tanchu(txt,tar){
alert("文字属于"+tar.tagName+"元素，选中内容为："+txt);
}

function getSelectedText()
{
if (window.getSelection)
{ // This technique is the most likely to be standardized.
// getSelection() returns a Selection object, which we do not document.
return window.getSelection().toString();
}
else if (document.getSelection)
{
// This is an older, simpler technique that returns a string
return document.getSelection();
}
else if (document.selection)
{
// This is the IE-specific technique.
// We do not document the IE selection property or TextRange objects.
return document.selection.createRange().text;
}
}