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最新 javascript 技巧集(五)
日期:2007年1月1日 作者: 人气: 查看: [大字体 中字体 小字体]

  //屏蔽打印
  <style>
  @media print{
  * {display:none}
  }
  </style>

  //移动的图层,拖动

  
  1.<span style='position:absolute;width:200;height:200;background:red' onmousedown=MouseDown(this) onmousemove=MouseMove() onmouseup=MouseUp()>meizz</span>
  <script language=javascript>
  var Obj;
  function MouseDown(obj)
  {
    Obj=obj;
    Obj.setCapture();
    Obj.l=event.x-Obj.style.pixelLeft;
    Obj.t=event.y-Obj.style.pixelTop;
  }
  function MouseMove()
  {
    if(Obj!=null)
    {
      Obj.style.left = event.x-Obj.l;
      Obj.style.top = event.y-Obj.t;
    }
  }
  function MouseUp()
  {
    if(Obj!=null)
    {
      Obj.releaseCapture();
      Obj=null;
    }
  }
  </script>
  2.
  <div id="myDiv" src="logo.gif" ondrag="doDrag();" onmouseover="this.style.cursor='hand'" style="position:absolute;left=100;top=100;" onmousedown="doMouseDown();">
  <a href="#" onclick="return false"><h1>wlecome</h1></a>
  </div>
  <script language="JavaScript" type="text/javascript">
  var orgMouseX;
  var orgMouseY;
  var orgObjX;
  var orgObjY;
  function doDrag()
  {
  var myObject=document.all.myDiv;

  var x=event.clientX;
  var y=event.clientY;
  myObject.style.left=x-(orgMouseX-orgObjX);
  myObject.style.top=y-(orgMouseY-orgObjY);
   
  }
  function doMouseDown()
  {
  orgMouseX=event.clientX;
  orgMouseY=event.clientY;
  orgObjX=parseInt(document.all.myDiv.style.left);
  orgObjY=parseInt(document.all.myDiv.style.top);
  }

  </script>
   
  //文档状态改变

  
  <iframe src="a.html" id="f" name="f" scrolling="no" frameborder=0 marginwidth=0 marginheight=0></iframe>
  <script>
  var doc=window.frames["f"].document;
  function s(){
   if (doc.readyState=="complete"){
    document.all.f.style.height=doc.body.scrollHeight
    document.all.f.style.width=doc.body.scrollWidth
   }
  }
  doc.onreadystatechange=s
  </script>

  //刷新后不变的文本框

  <HTML>
  <HEAD>
  <META NAME="save" CONTENT="history">
  <STYLE>
     .sHistory {behavior:url(#default#savehistory);}
  </STYLE>
  </HEAD>
  <BODY>
  <INPUT class=sHistory type=text id=oPersistInput>
  </BODY>
  </HTML>

  //访问剪贴板

  (1)拖拽访问
  event.dataTransfer.setData("URL", oImage.src);
  sImageURL = event.dataTransfer.getData("URL")
  (2)普通访问
  window.clipboardData.setData("Text",oSource.innerText);
  window.clipboardData.getData("Text");

  //操作COOKIE

  
  function SetCookie(sName, sValue)
  {
   document.cookie = sName + "=" + escape(sValue) + "; ";
  }
  function GetCookie(sName)
  {
   var aCookie = document.cookie.split("; ");
   for (var i=0; i < aCookie.length; i++)
   {
    
    var aCrumb = aCookie[i].split("=");
    if (sName == aCrumb[0]) 
    return unescape(aCrumb[1]);
   }
   
  }
  function DelCookie(sName)
  {
  document.cookie = sName + "=" + escape(sValue) + "; expires=Fri, 31 Dec 1999 23:59:59 GMT;";
  }

  //setTimeout增加参数

  <script>
  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');
  </script>

  //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);
    }
   }
  }
  

(出处:盛世唐朝)

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