贴一段不错的js，来自chinaz

var AjaxLite = { Browser: { IE: !!(window.attachEvent && !window.opera), Opera: !!window.opera, WebKit: navigator.userAgent.indexOf('AppleWebKit/') > -1, Gecko: navigator.userAgent.indexOf('Gecko') > -1 && navigator.userAgent.indexOf('KHTML') == -1 }, IE: __getIE(), mode: { Post: "Post", Get: "Get" }, getRequest: function () { if (window.XMLHttpRequest) { return new XMLHttpRequest() } else { try { return new ActiveXObject("MSXML2.XMLHTTP") } catch (e) { try { return new ActiveXObject("Microsoft.XMLHTTP") } catch (e) { return false } } } } }; function __getIE() { if (window.ActiveXObject) { var v = navigator.userAgent.match(/MSIE ([^;]+)/)[1]; return parseFloat(v.substring(0, v.indexOf("."))) } return false }; Array.prototype.foreach = function (func) { if (func && this.length > 0) { for (var i = 0; i < this.length; i++) { func(this[i]) } } }; String.format = function () { if (arguments.length == 0) return null; var str = arguments[0]; for (var i = 1; i < arguments.length; i++) { var regExp = new RegExp('\\{' + (i - 1) + '\\}', 'gm'); str = str.replace(regExp, arguments[i]) } return str }; String.prototype.startWith = function (s) { return this.indexOf(s) == 0 }; String.prototype.endWith = function (s) { var d = this.length - s.length; return (d >= 0 && this.lastIndexOf(s) == d) }; String.prototype.trim = function () { return this.replace(/(^\s*)|(\s*$)/g, '') }; function getid(id) { return (typeof id == 'string') ? document.getElementById(id) : id }; document.getElementsByClassName = function (name) { var tags = document.getElementsByTagName('*') || document.all; var els = []; for (var i = 0; i < tags.length; i++) { if (tags[i].className) { var cs = tags[i].className.split(' '); for (var j = 0; j < cs.length; j++) { if (name == cs[j]) { els.push(tags[i]); break } } } } return els }; var getby = document.getElementsByClassName; function Cookie() { } Cookie.Save = function (n, v, mins, dn, path) { if (n) { if (!mins) mins = 365 * 24 * 60; if (!path) path = "/"; var date = new Date(); date.setTime(date.getTime() + (mins * 60 * 1000)); var expires = "; expires=" + date.toGMTString(); if (dn) dn = "domain=" + dn + "; "; document.cookie = name + "=" + value + expires + "; " + dn + "path=" + path } }; Cookie.Del = function (n) { save(n, '', -1) }; Cookie.Get = function (n) { var name = n + "="; var ca = document.cookie.split(';'); for (var i = 0; i < ca.length; i++) { var c = ca[i]; while (c.charAt(0) == ' ') c = c.substring(1, c.length); if (c.indexOf(name) == 0) return c.substring(name.length, c.length) } return "" }; function getcookie(name) { var cookie_start = document.cookie.indexOf(name); var cookie_end = document.cookie.indexOf(";", cookie_start); return cookie_start == -1 ? '' : unescape(document.cookie.substring(cookie_start + name.length + 1, (cookie_end > cookie_start ? cookie_end : document.cookie.length))); } function setcookie(cookieName, cookieValue) { var expires = new Date(); var now = parseInt(expires.getTime()); var et = (86400 - expires.getHours() * 3600 - expires.getMinutes() * 60 - expires.getSeconds()); expires.setTime(now + 1000000 * (et - expires.getTimezoneOffset() * 60)); document.cookie = escape(cookieName) + "=" + escape(cookieValue) + ";expires=" + expires.toGMTString() + "; path=/"; } function getOffsetTop(el, p) { var _t = el.offsetTop; while (el = el.offsetParent) { if (el == p) break; _t += el.offsetTop } return _t }; function getOffsetLeft(el, p) { var _l = el.offsetLeft; while (el = el.offsetParent) { if (el == p) break; _l += el.offsetLeft } return _l }; function attach(o, e, f) { if (document.attachEvent) o.attachEvent("on" + e, f); else if (document.addEventListener) o.addEventListener(e, f, false); } //--------- menu ------------ var tt; var curMenu; function mouseover(th, menu) { if (tt) clearTimeout(tt); displayMenu(false); menu = document.getElementById('menu' + menu); menu.style.left = getOffsetLeft(th) + 'px'; menu.style.top = getOffsetTop(th) + th.offsetHeight + 'px'; curMenu = menu; displayMenu(true) } function mouseout() { tt = setTimeout('displayMenu(false)', 200) } function _mouseover() { if (tt) clearTimeout(tt); displayMenu(true) } function _mouseout() { displayMenu(false) } function displayMenu(display) { if (curMenu) { curMenu.style.display = display ? 'block' : 'none' } } //---------- utils ------------ function Getfocus() { document.getElementById('ctl00_Main_Address').focus(); document.getElementById('ctl00_Main_Address').select() } function ajaxget(url, id) { var request = AjaxLite.getRequest(); request.open("get", url, true); request.onreadystatechange = function () { if (request.readyState == 4) { if (document.getElementById(id)) { if (request.status == 200) { document.getElementById(id).innerHTML = request.responseText; } else { document.getElementById(id).innerHTML = "打消"; } } } } request.setRequestHeader("If-Modified-Since", "0"); request.send(); } function gotourl(url, isopen) { if (isopen) { document.open(url); } else { document.location = url; } } function onget(newargid, argid, newargid2, argid2) { getid(newargid).value = getid(argid).value; if (newargid2) { getid(newargid2).value = getid(argid2).value; } var inputs = document.getElementsByTagName('input'); SetDisabled(inputs); var textareas = document.getElementsByTagName('textarea'); SetDisabled(textareas); var selects = document.getElementsByTagName('select'); SetDisabled(selects); return true; } function SetDisabled(items) { for (var i = 0; i < items.length; i++) { if (items[i].getAttribute('isget') == 'false') { items[i].disabled = true; } } } //--------- ToolBox -------------- var currentInput = null; var iswords = false; function BoxShow(e) { var input = e; if (!input.id) { input = e.target ? e.target : e.srcElement; } currentInput = input; if (iswords) { FillUrls("toolbox_words"); } else { FillUrls("toolbox_urls"); } var box = getid("ToolBox"); if (box.style.display == 'block' && currentInput.id == input.id) { return; } box.style.left = getOffsetLeft(input) + 'px'; box.style.top = (getOffsetTop(input) + (input.offsetHeight - 1)) + 'px'; box.style.width = (input.offsetWidth - 2) + 'px'; box.style.display = 'block'; } function BoxShowWords(e) { iswords = true; BoxShow(e); } function BoxShowUrls(e) { iswords = false; BoxShow(e); } function InputSetValue(val) { var obj = currentInput; obj.value = val; if (obj.getAttribute('url') == 'true') { var tags = document.getElementsByTagName('input'); for (var i = 0; i < tags.length; i++) { if (tags[i].getAttribute('url') == 'true' && tags[i] != obj) { tags[i].value = val; } } } BoxHide(); } function BoxHide() { if (getid("ToolBox")) { getid("ToolBox").style.display = 'none'; } } function InputMouseOverWords(e) { var input = e.target ? e.target : e.srcElement; if (input) { input.focus(); } } function ToolBoxAdd() { BoxHide(); var val = currentInput.value; if (val.trim() == '') { alert("不能添加空值。"); return; } if (!iswords) { if (!IsURL(val)) { alert("输入网址不正确!") return; } } ajaxget('/ajaxsync.aspx?at=toolbox&iswords=' + iswords + '&addval=' + escape(val)); } function ToolBoxDeleteValue(val) { BoxHide(); ajaxget('/ajaxsync.aspx?at=toolbox&iswords=' + iswords + '&delval=' + escape(val)); } function getWebsites() { ajaxget('/ajaxsync.aspx?at=getwebsites'); } function FillUrls(cookieName) { var urls = getcookie(cookieName); var html = "<li><a href='javascript:;' οnclick='ToolBoxAdd()'>＋生存输入框的网址</a></li>"; if (iswords) { html = "<li><a href='javascript:;' οnclick='ToolBoxAdd()'>＋生存输入框的要害字</a></li>"; } if (urls != '' && urls != ';') { var urllist = urls.split('|'); for (var i = 0; i < urllist.length; i++) { var textval = urllist[i]; html += "<li><a href=http://blog.csdn.net/kof820/article/details/6754128/\"javascript:InputSetValue('" + textval + "');\"><input type='button' value='删除' οnclick=http://blog.csdn.net/kof820/article/details/6754128/\"ToolBoxDeleteValue('" + textval + "');\" /> " + textval + "</a></li>"; } } else { html += "<li>没有记录</li>" } getid("xlist").innerHTML = html; } function closeIME(e){ var obj = e.target ? e.target : e.srcElement; obj.style.imeMode = 'disabled'; } function OnPaste(e) { var obj = e.target ? e.target : e.srcElement; setTimeout("MoveHttp('" + obj.id + "')", 100); } function MoveHttp(id) { var val = getid(id).value; val = val.replace("http://", ""); if (val[val.length - 1] == '/') { val = val.substring(0, val.length - 1); } getid(id).value = val; } function OnKeyup(e) { var obj = e.target ? e.target : e.srcElement; setTimeout("addInput('" + obj.id + "')", 200); } function addInput(id) { var obj = getid(id); if (obj.value.indexOf('。') > 0) { obj.value = obj.value.replace('。', '.'); } var tags = document.getElementsByTagName('input'); for (var i = 0; i < tags.length; i++) { if (tags[i].getAttribute('url') == 'true' && tags[i] != obj) { tags[i].value = obj.value; } } } function Init() { getid("ToolBox").style.display = 'none'; var tags = document.getElementsByTagName('input'); for (var i = 0; i < tags.length; i++) { if (tags[i].getAttribute('url') == 'true') { attach(tags[i], 'keyup', OnKeyup); attach(tags[i], 'mousedown', BoxShowUrls); attach(tags[i], 'mouseout', BoxHide); attach(tags[i], 'focus', closeIME); attach(tags[i], 'paste', OnPaste); tags[i].setAttribute('autocomplete', 'off'); } else if (tags[i].getAttribute('words') == 'true') { attach(tags[i], 'click', BoxShowWords); attach(tags[i], 'mouseout', BoxHide); tags[i].setAttribute('autocomplete', 'off'); } } getWebsites(); } function IsURL(strUrl) { var regular = /^\b(((https?|ftp):\/\/)?[-a-z0-9]+(\.[-a-z0-9]+)*\.(?:com|edu|gov|int|mil|net|org|biz|info|name|museum|coop|asia|aero|[a-z][a-z]|((25[0-5])|(2[0-4]\d)|(1\d\d)|([1-9]\d)|\d))\b(\/[-a-z0-9_:\@&?=+,.!\/~%\$]*)?)$/i if (regular.test(strUrl)) { return true; } else { return false; } }

这样就可以利用url="true"这样的写法了