JavaScript高级应用(二)（转）

2021-12-17 21:40:05

1.组件是否安装

//组件是否安装

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

2.检查网页是否存在

//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;

}

3.连接数据库

//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;

</script>

4.使用数据岛

//使用数据岛

<html>

<body>

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>

</body>

</html>

5.获取参数

//获得参数

<body>

<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);

  alert(s.split("=")[1]);

}

}

//-->

</script>

</body>

6.操作EXECL

//操作EXECL

<script language="javascript">

function jStartExcel() {

var xls = new ActiveXObject ( "Excel.Application" );

xls.visible = true;

var newBook = xls.Workbooks.Add;

newBook.Worksheets.Add;

newBook.Worksheets(1).Activate;

xls.ActiveWorkBook.ActiveSheet.PageSetup.Orientation = 2;

xls.ActiveWorkBook.ActiveSheet.PageSetup.PaperSize = 5;

newBook.Worksheets(1).Columns("A").columnwidth=50;

newBook.Worksheets(1).Columns("A").WrapText = true;

newBook.Worksheets(1).Columns("B").columnwidth=50;

newBook.Worksheets(1).Columns("B").WrapText = true;

newBook.Worksheets(1).Range("A1:B1000").NumberFormat = "0";

newBook.Worksheets(1).Range("A1:B1000").HorizontalAlignment = -4131;

newBook.Worksheets(1).Cells(1,1).Interior.ColorIndex="15";

newBook.Worksheets(1).Cells(1,1).value="First Column, First Cell";

newBook.Worksheets(1).Cells(2,1).value="First Column, Second Cell";

newBook.Worksheets(1).Cells(1,2).value="Second Column, First Cell";

newBook.Worksheets(1).Cells(2,2).value="Second Column, Second Cell";

newBook.Worksheets(1).Name="My First WorkSheet";

}

</script>

7.自定义提示条

//自定义提示条
<a href="#" title="这是提示">tip</a>

<script Language="JavaScript">

//***********默认设置定义.*********************

tPopWait=50;//停留tWait豪秒后显示提示。

tPopShow=5000;//显示tShow豪秒后关闭提示

showPopStep=20;

popOpacity=99;

//***************内部变量定义*****************

sPop=null;

curShow=null;

tFadeOut=null;

tFadeIn=null;

tFadeWaiting=null;

document.write("<style type='text/css'id='defaultPopStyle'>");

document.write(".cPopText {  background-color: #F8F8F5;color:#000000; border: 1px #000000 solid;font-color: font-size: 12px; padding-right: 4px; padding-left: 4px; height: 20px; padding-top: 2px; padding-bottom: 2px; filter: Alpha(Opacity=0)}");

document.write("</style>");

document.write("<div id='dypopLayer' style='position:absolute;z-index:1000;' class='cPopText'></div>");

function showPopupText(){

var o=event.srcElement;

MouseX=event.x;

MouseY=event.y;

if(o.alt!=null && o.alt!=""){o.dypop=o.alt;o.alt=""};

        if(o.title!=null && o.title!=""){o.dypop=o.title;o.title=""};

if(o.dypop!=sPop) {

sPop=o.dypop;

clearTimeout(curShow);

clearTimeout(tFadeOut);

clearTimeout(tFadeIn);

clearTimeout(tFadeWaiting);

if(sPop==null || sPop=="") {

dypopLayer.innerHTML="";

dypopLayer.style.filter="Alpha()";

dypopLayer.filters.Alpha.opacity=0;

}

else {

if(o.dyclass!=null) popStyle=o.dyclass

else popStyle="cPopText";

curShow=setTimeout("showIt()",tPopWait);

}

}

}

function showIt(){

dypopLayer.className=popStyle;

dypopLayer.innerHTML=sPop;

popWidth=dypopLayer.clientWidth;

popHeight=dypopLayer.clientHeight;

if(MouseX+12+popWidth>document.body.clientWidth) popLeftAdjust=-popWidth-24

else popLeftAdjust=0;

if(MouseY+12+popHeight>document.body.clientHeight) popTopAdjust=-popHeight-24

else popTopAdjust=0;

dypopLayer.style.left=MouseX+12+document.body.scrollLeft+popLeftAdjust;

dypopLayer.style.top=MouseY+12+document.body.scrollTop+popTopAdjust;

dypopLayer.style.filter="Alpha(Opacity=0)";

fadeOut();

}

function fadeOut(){

if(dypopLayer.filters.Alpha.opacity<popOpacity) {

dypopLayer.filters.Alpha.opacity+=showPopStep;

tFadeOut=setTimeout("fadeOut()",1);

}

else {

dypopLayer.filters.Alpha.opacity=popOpacity;

tFadeWaiting=setTimeout("fadeIn()",tPopShow);

}

}

function fadeIn(){

if(dypopLayer.filters.Alpha.opacity>0) {

dypopLayer.filters.Alpha.opacity-=1;

tFadeIn=setTimeout("fadeIn()",1);

}

}

document.onmouseover=showPopupText;

</script>

8.判断键值

<html>

<meta http-equiv="Content-Type" content="text/html; charset=gb2312">

<head>

<script language="javascript">

var ie  =navigator.appName=="Microsoft Internet Explorer"?true:false; 

function keyDown(e)

{

if(!ie)

{

  var nkey=e.which;

  var iekey='现在是ns浏览器';

  var realkey=String.fromCharCode(e.which);

}

if(ie)

{

  var iekey=event.keyCode;

  var nkey='现在是ie浏览器';

  var realkey=String.fromCharCode(event.keyCode);

  if(event.keyCode==32){realkey='\' 空格\''}

  if(event.keyCode==13){realkey='\' 回车\''}

  if(event.keyCode==27){realkey='\' Esc\''}

  if(event.keyCode==16){realkey='\' Shift\''}

  if(event.keyCode==17){realkey='\' Ctrl\''}

  if(event.keyCode==18){realkey='\' Alt\''}

}

alert('ns浏览器中键值:'+nkey+'\n'+'ie浏览器中键值:'+iekey+'\n'+'实际键为'+realkey);

}

document.onkeydown = keyDown;

</script>

</head>

<body>

//Javascript Document.

<hr>

<center>

<h3>请按任意一个键。。。。</h3>

</center>

</body>

</html>

9.取得innerText

<SCRIPT LANGUAGE="JavaScript">

<!--

var xmlDoc = new ActiveXObject("Msxml2.DOMDocument.4.0");

var currNode;

xmlDoc.async = false;

xmlDoc.async = false;

xmlDoc.loadXML("<TABLENAME>      你好你阿三    大法     司法等四              </TABLENAME>");

currNode = xmlDoc.documentElement; 

  var s = currNode.xml;

  var r = /\<([^\>\s]*?)[^\>]*?\>([^\<]*?)\<\/\1\>/

  var b = s.replace(r,"$2");

  alert(b);

//-->

</SCRIPT>

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