javascript 应用小技巧方法汇总

内容摘要

javascript 在前端应用体验小技巧继续积累。

事件源对象 event.srcElement.tagName
event.srcElement.type
捕获释放 event.srcElement.setCapture();
event.srcElement

文章正文

javascript 在前端应用体验小技巧继续积累。

事件源对象 event.srcElement.tagName 
event.srcElement.type
捕获释放 event.srcElement.setCapture(); 
event.srcElement.releaseCapture(); 
事件按键 event.keyCode event.shiftKey 
event.altKey event.ctrlKey
事件返回值 event.returnValue
鼠标位置 event.x event.y
窗体活动元素 document.activeElement
绑定事件 
document.captureEvents(Event.KEYDOWN);
访问窗体元素 document.all("txt").focus(); 
document.all("txt").select();
窗体命令 document.execCommand
窗体COOKIE document.cookie
菜单事件 document.oncontextmenu
创建元素 document.createElement("SPAN"); 
根据鼠标获得元素： 
document.elementFromPoint(event.x,event.y).tagName=="TD 
document.elementFromPoint(event.x,event.y).appendChild(ms) 
窗体图片 document.images[索引]
窗体事件绑定 
document.onmousedown=scrollwindow;
元素 document.窗体.elements[索引]
对象绑定事件 
document.all.xxx.detachEvent('onclick',a);
插件数目 navigator.plugins
取变量类型 typeof($js_libpath) == "undefined"
下拉框 下拉框.options[索引] 
下拉框.options.length
查找对象 document.getElementsByName("r1"); 
document.getElementById(id);
定时 
timer=setInterval('scrollwindow()',delay); 
clearInterval(timer);
UNCODE编码 escape() ,unescape
父对象 obj.parentElement(dhtml) 
obj.parentNode(dom)
交换表的行 TableID.moveRow(2,1)
替换CSS document.all.csss.href = "a.css";
并排显示 display:inline
隐藏焦点 hidefocus=true
根据宽度换行 
style="word-break:break-all"
自动刷新 <meta HTTP-EQUIV="refresh" CONTENT="8;URL=http://c98.yeah.net">
简单邮件 <a href="mailto:aaa@bbb.com?subject=ccc&body=xxxyyy"> 
快速转到位置 
obj.scrollIntoView(true)
锚 <a name="first"> <a href="#first">anchors</a>
网页传递参数 location.search();
可编辑 obj.contenteditable=true
执行菜单命令 obj.execCommand
双字节字符 /[^\x00-\xff]/ 汉字 
/[\u4e00-\u9fa5]/
让英文字符串超出表格宽度自动换行word-wrap: break-word; word-break: break-all;
透明背景 <IFRAME src="1.htm" width=300 height=180 allowtransparency></iframe>
获得style内容 obj.style.cssText
HTML标签 
document.documentElement.innerHTML
第一个style标签 document.styleSheets[0]
style标签里的第一个样式 
document.styleSheets[0].rules[0]
防止点击空链接时，页面往往重置到页首端。 <a href="javascript:function()">word</a>
上一网页源 asp: request.servervariables("HTTP_REFERER") 
javascript: document.referrer
释放内存 CollectGarbage();
禁止右键document.oncontextmenu = function() { return false;}
禁止保存 <noscript><iframe src="*.htm"></iframe></noscript>
禁止选取<body oncontextmenu="return false" ondragstart="return false" onselectstart ="return false" onselect="document.selection.empty()" oncopy="document.selection.empty()" onbeforecopy="return false"onmouseup="document.selection.empty()>
禁止粘贴 <input type=text onpaste="return false">
地址栏图标 <link rel="Shortcut Icon" href="favicon.ico"> favicon.ico 名字最好不变16*16的16色,放虚拟目录根目录下
收藏栏图标 <link rel="Bookmark" href="favicon.ico">
查看源码 <input type=button value=查看网页源代码 onclick="window.location = 'view-source:'+ 'http://www.csdn.net/'">
关闭输入法 <input style="ime-mode:disabled">
自动全选<input type=text name=text1 value="123" onfocus="this.select()">
ENTER键可以让光标移到下一个输入框 <input onkeydown="if(event.keyCode==13)event.keyCode=9">
文本框的默认值 <input type=text value="123" onfocus="alert(this.defaultValue)">
title换行 obj.title = "123sdfs "
获得时间所代表的微秒 var n1 = new Date("2004-10-10".replace(/-/g, "\/")).getTime()
窗口是否关闭 win.closed
checkbox扁平 <input type=checkbox style="position: absolute; clip:rect(5px 15px 15px 5px)"><br>
获取选中内容 
document.selection.createRange().duplicate().text
自动完成功能 <input type=text autocomplete=on>打开该功能 
<input type=text autocomplete=off>关闭该功能  
窗口最大化 <body onload="window.resizeTo(window.screen.width - 4,window.screen.height-50);window.moveTo(-4,-4)">
无关闭按钮IE window.open("aa.htm", "meizz", "fullscreen=7");
统一编码/解码 
alert(decodeURIComponent(encodeURIComponent("http://你好.com?as= hehe"))) encodeURIComponent对":"、"/"、";" 和 "?"也编码
表格行指示 <tr onmouseover="this.bgColor='#f0f0f0'" onmouseout="this.bgColor='#ffffff'">

//各种尺寸

s += "\r\n网页可见区域宽："+ document.body.clientWidth;  
s += "\r\n网页可见区域高："+ document.body.clientHeight;  
s += "\r\n网页可见区域高："+ document.body.offsetWeight +" (包括边线的宽)";  s += "\r\n网页可见区域高："+ document.body.offsetHeight +" (包括边线的宽)";  s += "\r\n网页正文全文宽："+ document.body.scrollWidth;  
s += "\r\n网页正文全文高："+ document.body.scrollHeight;  
s += "\r\n网页被卷去的高："+ document.body.scrollTop;  
s += "\r\n网页被卷去的左："+ document.body.scrollLeft;  
s += "\r\n网页正文部分上："+ window.screenTop;  
s += "\r\n网页正文部分左："+ window.screenLeft;  
s += "\r\n屏幕分辨率的高："+ window.screen.height;  
s += "\r\n屏幕分辨率的宽："+ window.screen.width;  
s += "\r\n屏幕可用工作区高度："+ window.screen.availHeight;  
s += "\r\n屏幕可用工作区宽度："+ window.screen.availWidth;

//过滤数字

http://([\w-]+\.)+[\w-]+(/[\w- ./?%&=]*)? 以下是例子：利用正则表达式限制网页表单里的文本框输入内容：用正则表达式限制只能输入中文：onkeyup="value=value.replace(/[^\u4E00-\u9FA5]/g,'')" onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\u4E00-\u9FA5]/g,''))"
1.用正则表达式限制只能输入全角字符： onkeyup="value=value.replace(/[^\uFF00-\uFFFF]/g,'')" onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\uFF00-\uFFFF]/g,''))"
2.用正则表达式限制只能输入数字：onkeyup="value=value.replace(/[^\d]/g,'') "onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\d]/g,''))"
3.用正则表达式限制只能输入数字和英文：onkeyup="value=value.replace(/[\W]/g,'') "onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\d]/g,''))"

//消除图像工具栏

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>

//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

复制代码代码如下:

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

复制代码代码如下:

<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>

//使用数据岛

复制代码代码如下:

<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>

//获得参数

复制代码代码如下:

<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[i]);   alert(s[i].split("=")[1]); } } //--> </script> </body>

//可编辑SELECT

复制代码代码如下:

<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>

//设置光标位置

复制代码代码如下:

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

复制代码代码如下:

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; }

//操作EXECL

复制代码代码如下:

<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>

//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>

//插入文字

复制代码代码如下:

document.onclick =function(){  var oSource = window.event.srcElement;  if(oSource.tagName!="DIV")  return false;  

var sel = document.selection;  if (sel!=null) {  var rng = sel.createRange();  if (rng!=null)  rng.pasteHTML("<font color=red>插入文字</font>");  

}  } 

//netscapte下操作xml

doc = new ActiveXObject("Msxml2.DOMDocument"); doc = new ActiveXObject("Microsoft.XMLDOM") ->> doc = (new DOMParser()).parseFromString(sXML,'text/xml')

//判断键值

复制代码代码如下:

<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>

//禁止FSO

1.注销组件
regsvr32 /u scrrun.dll 2.修改PROGID
HKEY_CLASSES_ROOT\Scripting.FileSystemObject Scripting.FileSystemObject
3.对于使用object的用户，修改HKEY_CLASSES_ROOT\Scripting.
//省略号

<DIV STYLE="width: 120px; height: 50px; border: 1px solid blue;
overflow: hidden; text-overflow:ellipsis">
<NOBR>就是比如有一行文字，很长，表格内一行显示不下.</NOBR> </DIV>

//检测media play版本

<IE:clientCaps ID="oClientCaps" style="{behavior:url(#default#clientcaps)}" />
<SCRIPT> var flash="";
    WMPVersion= oClientCaps.getComponentVersion("{22D6F312-B0F6-11D0-94AB-0080C74C7E95}","ComponentID");      if (WMPVersion != "") {     flash = "";     var version = WMPVersion.split(",");     var i;
    for (i = 0; i < version.length; i++) {       if (i != 0)     flash += ".";       flash += version[i];     }
     document.write("您的Windows Media Player 版本是:"+flash+"<p>");   } </SCRIPT>

//图象按比例

<script language="JavaScript"> <!-- //图片按比例缩放 var flag=false; function DrawImage(ImgD){ var image=new Image(); var iwidth = 80; //定义允许图片宽度 var iheight = 80; //定义允许图片高度 image.src=ImgD.src; if(image.width>0 && image.height>0){ 
flag=true; if(image.width/image.height>= iwidth/iheight){ 
 if(image.width>iwidth){  
 ImgD.width=iwidth;  ImgD.height=(image.height*iwidth)/image.width; 
 }else{  ImgD.width=image.width;  
 ImgD.height=image.height;  }  ImgD.alt=image.width+"×"+image.height;  } else{  if(image.height>iheight){  
 ImgD.height=iheight; 
 ImgD.width=(image.width*iheight)/image.height;   }else{  ImgD.width=image.width;  
 ImgD.height=image.height;  }  ImgD.alt=image.width+"×"+image.height;  } } } //--> </script> <img src=".." onload = "DrawImage(this)">

//细线SELECT

<span style="border:1px solid #000000; position:absolute; overflow:hidden;" > 
<select style="margin:-2px;"> <option>1111</option> 
<option>11111111111111</option> 
<option>111111111</option> 
</select></span>

//Import

function Import() { for( var i=0; i<arguments.length; i++ ) { 
 var file = arguments[i];  if ( file.match(/\.js$/i)) 
  document.write('<script type=\"text/javascript\" src=\"' + file + '\"></sc' + 'ript>'); 
 else 
  document.write('<style type=\"text/css\">@import \"' + file + '\" ;</style>'); 
} };

//js枚举

function getComputerName() { var objWMIService = GetObject("Winmgmts:root\cimv2"); for(e = new Enumerator(objWMIService) ; !e.atEnd() ; e.moveNext()) 
{   var getComputer = e.item(); 
  return getComputer.Name; } 
}

//条件编译

<script language=javascript> 
/*@cc_on @*/ /*@if (@_win32 && @_jscript_version>5) 
function window.confirm(str) { 
  execScript("n = msgbox('"+ str +"', 257)", "vbscript"); 
  return(n == 1); } @end @*/ </script>

//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>

//mergeAttributes 复制所有读/写标签属性到指定元素。

<SCRIPT> 
function fnMerge(){ 
oSource.children[1].mergeAttributes(oSource.children[0]); } 
</SCRIPT> <SPAN ID=oSource> <DIV ID="oDiv" ATTRIBUTE1="true" ATTRIBUTE2="true" onclick="alert('click');" onmouseover="this.style.color='#0000FF';" onmouseout="this.style.color='#000000';" > 
This is a sample <B>DIV</B> element. </DIV> 
<DIV ID="oDiv2"> 
This is another sample <B>DIV</B> element. </DIV> 
</SPAN> <INPUT TYPE="button" VALUE="Merge Attributes" onclick="fnMerge()" >

以上所述就是本文的全部内容了，希望大家能够喜欢。

代码注释

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