收集的Javascript常用函数(分享)

<script>
/*判断浏览器版本*/
var w3c=(document.getElementById)? true: false;
var agt=navigator.userAgent.toLowerCase();
var ie = ((agt.indexOf("msie") != -1) && (agt.indexOf("opera") == -1) && (agt.indexOf("omniweb") == -1));
var ie5=(w3c && ie)? true : false;
var ns6=(w3c && (navigator.appName=="Netscape"))? true: false;
var op8=(navigator.userAgent.toLowerCase().indexOf("opera")==-1)? false:true;
function ExChgCls(o,a,b){//切换对象的className
o.className=o.className==a?b:a;
}
function ExChgHtml(o,a,b){//切换对象的innerHTML
o.innerHTML=o.innerHTML==a?b:a;
}
function Oh(o,s){ //输出字符串给某个对象
Ob(o).innerHTML=s;
}
function SetSrc(o,s){//改变img、iframe等对象的src值
Ob(o).src=s;
}  //by www.jiaochengji.com
function Ob(o){//取得一个对象
return document.getElementById(o)?document.getElementById(o):o;
}
function IsSubStr(p,s){//判断是否为子字符串
return (p.indexOf(s)>-1);
}
function Hd(o){//隐藏某个对象
Ob(o).style.display="none";
}
function Sw(o){//显示某个对象
Ob(o).style.display="block";
}
function Sw2(o){//显示某个对象
Ob(o).style.display="";
}
function Sf(o,s,b){
//该函数用于多按钮共用同一表单,其中：o为表单的ID b为隐藏的input的ID(其value供后如判断用户提交动作类型) s为用户提交动作类型
Ob(b).value=s;
Ob(o).submit();
}

/*XmlHttp*/
function Gp(url,o){ //GetHttpPage
var o=Ob(o);
var PageRequest = false;
IsLoading(o);
if (window.XMLHttpRequest) {// if Mozilla, Safari etc
PageRequest = new XMLHttpRequest();
}
else if (window.ActiveXObject){ // if IE
try {
PageRequest = new ActiveXObject("Msxml2.XMLHTTP");
}
catch (e){
try{
PageRequest = new ActiveXObject("Microsoft.XMLHTTP");
}
catch (e){;}
}
}
else {return false ;}
PageRequest.onreadystatechange=function(){
if (PageRequest.readyState == 4) {
Lp(PageRequest,o);
}
}
PageRequest.open('GET', url, true);
PageRequest.send(null);
}
function Lp(PageRequest,o){ //LoadPage
if (PageRequest.readyState == 4 && (PageRequest.status==200 || window.location.href.indexOf("http")==-1))
Ob(o).innerHTML=PageRequest.responseText;
//Hd("OpMsg");
}
function IsLoading(o){
o.innerHTML="数据加载中，请稍候......";
//Sw2("OpMsg");
}
</script>