选择自 lovinglgz 的 Blog 常用的一些javascript小技巧
 from:http://www.blueidea.com/bbs/NewsDetail.asp?lp=1&id=2201069
 
//setTimeout增加参数
 
var _st = window.setTimeout;
window.setTimeout = function(fRef, mDelay) {
 if(typeof fRef == 'function'){
  var argu = Array.prototype.slice.call(arguments,2);
  var f = (function(){ fRef.apply(null, argu); });
  return _st(f, mDelay);
 }
 return _st(fRef,mDelay);
}
function test(x){
 alert(x);
}
window.setTimeout(test,1000,'fason');
 

 [Ctrl+A 全部选择 提示：你可先修改部分代码，再按运行]
//自定义的apply,call

Function.prototype.apply = function (obj, argu) {
 if (obj) obj.constructor.prototype._caller = this; 
 var argus = new Array();
 for (var i=0;i<argu.length;i++)
  argus[i] = "argu[" + i + "]";
 var r;
 eval("r = " + (obj ? ("obj._caller(" + argus.join(",") + ");") : ("this(" + argus.join(",") + ");")));
 return r;
};
Function.prototype.call = function (obj) {
 var argu = new Array();
 for (var i=1;i<arguments.length;i++)
  argu[i-1] = arguments[i];
 return this.apply(obj, argu);
};       

//下载文件

function DownURL(strRemoteURL,strLocalURL)
{
 try
 {
  var xmlHTTP=new ActiveXObject("Microsoft.XMLHTTP");
  xmlHTTP.open("Get",strRemoteURL,false);
  xmlHTTP.send();
  var adodbStream=new ActiveXObject("ADODB.Stream");
  adodbStream.Type=1;//1=adTypeBinary
  adodbStream.Open();
  adodbStream.write(xmlHTTP.responseBody);
  adodbStream.SaveToFile(strLocalURL,2);
  adodbStream.Close();
  adodbStream=null;
  xmlHTTP=null;
  
 }
 catch(e)
 {
  window.confirm("下载URL出错!");
 }
 //window.confirm("下载完成.");
}

//检验连接是否有效

function getXML(URL) 
{
 var xmlhttp = new ActiveXObject("microsoft.xmlhttp");
 xmlhttp.Open("GET",URL, false); 
 try
 { 
  xmlhttp.Send();
 }
 catch(e){}
 finally 
 {
  var result = xmlhttp.responseText;
  if(result) 
  {
   if(xmlhttp.Status==200)
   {
    return(true);
   }
   else 
   {
    return(false);
   }
  }
  else 
  {
   return(false);
  }
 }
}

//POST代替FORM
<SCRIPT language="VBScript">
Function URLEncoding(vstrIn)
    strReturn = ""
    For i = 1 To Len(vstrIn)
        ThisChr = Mid(vStrIn,i,1)
        If Abs(Asc(ThisChr)) < &HFF Then
            strReturn = strReturn & ThisChr
        Else
            innerCode = Asc(ThisChr)
            If innerCode < 0 Then
                innerCode = innerCode + &H10000
            End If
            Hight8 = (innerCode  And &HFF00)\ &HFF
            Low8 = innerCode And &HFF
            strReturn = strReturn & "%" & Hex(Hight8) &  "%" & Hex(Low8)
        End If
    Next
    URLEncoding = strReturn
End Function
Function bytes2BSTR(vIn)
    strReturn = ""
    For i = 1 To LenB(vIn)
        ThisCharCode = AscB(MidB(vIn,i,1))
        If ThisCharCode < &H80 Then
            strReturn = strReturn & Chr(ThisCharCode)
        Else
            NextCharCode = AscB(MidB(vIn,i+1,1))
            strReturn = strReturn & Chr(CLng(ThisCharCode) * &H100 + CInt(NextCharCode))
            i = i + 1
        End If
    Next
    bytes2BSTR = strReturn
End Function
dim strA,oReq
strA = URLEncoding("submit1=Submit&text1=中文")
set oReq = CreateObject("MSXML2.XMLHTTP")
oReq.open "POST","http://ServerName/VDir/TstResult.asp",false
oReq.setRequestHeader "Content-Length",Len(strA)
oReq.setRequestHeader "CONTENT-TYPE","application/x-www-form-urlencoded"
oReq.send strA
msgbox bytes2BSTR(oReq.responseBody)
</SCRIPT>

 [Ctrl+A 全部选择 提示：你可先修改部分代码，再按运行]
//readyState是xmlhttp返回数据的进度，0=载入中,1=未初始化,2=已载入,3=运行中,4=完成
//组件是否安装

isComponentInstalled("{6B053A4B-A7EC-4D3D-4567-B8FF8A1A5739}", "componentID"))

//检查网页是否存在

 

function CheckURL(URL)
{
  var xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
  xmlhttp.Open("GET",URL, false);
  try
  { 
    xmlhttp.Send(); 
    var result = xmlhttp.status;
  }
  catch(e) {return(false); }
  if(result==200)
  { 
    return true;
  }
  xmlhttp = null;
  return false;
}

//连接数据库

<script language="javascript">
  //用 JavaScript 写服务器端连接数据库的代码示例
  var conn = new ActiveXObject("ADODB.Connection");
  conn.Open("Provider=SQLOLEDB.1; Data Source=localhost; User ID=sa; "
    +"Password=; Initial Catalog=pubs");
  var rs = new ActiveXObject("ADODB.Recordset");
  var sql="select * from authors";
  rs.open(sql, conn);
 shtml = "<table width='100%' border=1>";
 shtml +="<tr bgcolor='#f4f4f4'><td>au_id</td><td>au_lname</td><td>au_fname</td><td>phone</td><td>address</td><td> city</td><td>state</td><td>zip</td></tr>";
  while(!rs.EOF)
  {
 shtml += "<tr><td>" + rs("au_id") + "</td><td>" + rs("au_lname") + "</td><td>" + rs("au_fname") + "</td><td>" + rs("phone") + "</td><td>" + rs("address") + "</td><td>" + rs("city") + "</td><td>" + rs("state") + "</td><td>" + rs("zip") + "</td></tr>";
 rs.moveNext;
  }
  shtml += "</table>";
  document.write(shtml);
  rs.close(); 
  rs = null; 
  conn.close(); 
  conn = null;

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//使用数据岛

 
 
srno：<input type=text datasrc=#xmldate DataFLD=srno size="76"><BR>
times：<input type=text datasrc=#xmldate DataFLD=times size="76"><BR>
<input id="first" TYPE=button value="<<　第一条记录" onclick="xmldate.recordset.moveFirst()">
<input id="prev" TYPE=button value="<上一条记录" onclick="xmldate.recordset.movePrevious()">  
<input id="next" TYPE=button value="下一条记录>" onclick="xmldate.recordset.moveNext()">  
<input id="last" TYPE=button value="最后一条记录>>" onclick="xmldate.recordset.moveLast()">   
<input id="Add" TYPE=button value="添加新记录" onclick="xmldate.recordset.addNew()">  

<XML ID="xmldate">
<infolist>
<info ><srno>20041025-01</srno><times>null</times></info>
<info ><srno>20041101-09</srno><times>2004年10月1日2点22分0秒</times></info>
</infolist>
</XML>
 

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//获得参数
 
<a href="javascript:location.href=location.href + '?a=1&b=2'">search</a>
<script language="JavaScript">
<!--
var a = location.search.substr(1);
if(a.length>0)
{
 var re = /([^&]*?)\=([^&]*)/g
 var s = a.match(re);
 for(var i= 0;i<s.length;i++)
 {
  alert(s[i]);
  alert(s[i].split("=")[1]);
 }
}
//-->
 
 

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//可编辑SELECT
<input type=text name=re_name style="width:100px;height:21px;font-size:10pt;"><span style="width:18px;border:0px solid red;"><select name="r00" style="margin-left:-100px;width:118px; background-color:#FFEEEE;" onChange="document.all.re_name.value=this.value;">
                <option value="1">11111111<option>
                <option value="2">222222</option>
                <option value="3">333333</option>
              </select>
              </span>

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//设置光标位置

 

function getCaret(textbox)
{
 var control = document.activeElement;
 textbox.focus();
 var rang = document.selection.createRange();
  rang.setEndPoint("StartToStart",textbox.createTextRange())
 control.focus();
 return rang.text.length;
}
function setCaret(textbox,pos)
{
 try
 {
  var r =textbox.createTextRange();
   r.moveStart('character',pos);
   r.collapse(true);
   r.select();
 }
 catch(e)
 {}
}
function selectLength(textbox,start,len)
{
 try
 {
  var r =textbox.createTextRange();
 
  r.moveEnd('character',len-(textbox.value.length-start));
  r.moveStart('character',start);
  
  r.select();
 }
 catch(e)
 {//alert(e.description)}
}
function insertAtCaret(textbox,text)
{
 textbox.focus();
 document.selection.createRange().text = text;
}

//页内查找

 

function findInPage(str)
{
 var txt, i, found,n = 0;
 if (str == "")
 {
  return false;
 }
 txt = document.body.createTextRange();
 for (i = 0; i <= n && (found = txt.findText(str)) != false; i++)
 {
  txt.moveStart("character", 1);
  txt.moveEnd("textedit");
 }
 if (found)
 {
  txt.moveStart("character", -1);
  txt.findText(str);
  txt.select();
  txt.scrollIntoView();
  n++;  
 }
 else
 {
  if (n > 0)
  {
   n = 0;
   findInPage(str);
  }
  else
  {
   alert(str + "...            您要找的文字不存在。\n \n请试着输入页面中的关键字再次查找！");
  }
 }
 return false;
}