网页教学网整理的JS技巧代码

http://www.itjxue.com 2015-08-06 23:19 来源:未知 点击次数:

//过滤数字

<input type=text onkeypress="return event.keyCode>=48&&event.keyCode<=57||(this.value.indexOf('.')<0?event.keyCode==46:false)" onpaste="return !clipboardData.getData('text').match(/\D/)" ondragenter="return false">

//特殊用途

//不缓存

//正则匹配

匹配中文字符的正则表达式： [\u4e00-\u9fa5]
匹配双字节字符(包括汉字在内)：[^\x00-\xff]
匹配空行的正则表达式：\n[\s| ]*\r
匹配HTML标记的正则表达式：/<(.*)>.*<\/\1>|<(.*) \/>/
匹配首尾空格的正则表达式：(^\s*)|(\s*$)（像vbscript那样的trim函数）
匹配Email地址的正则表达式：\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*
匹配网址URL的正则表达式：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

//无提示关闭

//取得控件得绝对位置(1)

//获得控件的绝对位置(2)

oRect = obj.getBoundingClientRect();
oRect.left
oRect.

//最小化,最大化,关闭

//光标停在文字最后

//页面进入和退出的特效

进入页面<meta http-equiv="Page-Enter" content="revealTrans(duration=x, transition=y)">
推出页面<meta http-equiv="Page-Exit" content="revealTrans(duration=x, transition=y)">
这个是页面被载入和调出时的一些特效。duration表示特效的持续时间，以秒为单位。transition表示使
用哪种特效，取值为1-23:
　　0 矩形缩小
　　1 矩形扩大
　　2 圆形缩小
　　3 圆形扩大
　　4 下到上刷新
　　5 上到下刷新
　　6 左到右刷新
　　7 右到左刷新
　　8 竖百叶窗
　　9 横百叶窗
　　10 错位横百叶窗
　　11 错位竖百叶窗
　　12 点扩散
　　13 左右到中间刷新
　　14 中间到左右刷新
　　15 中间到上下
　　16 上下到中间
　　17 右下到左上
　　18 右上到左下
　　19 左上到右下
　　20 左下到右上
　　21 横条
　　22 竖条
　　23

//网页是否被检索

//打印分页

//设置打印

//自带的打印预览

WebBrowser.ExecWB(1,1) 打开
Web.ExecWB(2,1) 关闭现在所有的IE窗口，并打开一个新窗口
Web.ExecWB(4,1) 保存网页
Web.ExecWB(6,1) 打印
Web.ExecWB(7,1) 打印预览
Web.ExecWB(8,1) 打印页面设置
Web.ExecWB(10,1) 查看页面属性
Web.ExecWB(15,1) 好像是撤销，有待确认
Web.ExecWB(17,1) 全选
Web.ExecWB(22,1) 刷新
Web.ExecWB(45,1) 关闭窗体无提示
<style media=print>
.Noprint{display:none;}
.PageNext{page-break-after: always;}
</style>
<object id="WebBrowser" width=0 height=0 classid="CLSID:8856F961-340A-11D0-A96B-00C04FD705A2">
</object>
<center class="Noprint" >
<input type=button value=打印 onclick=document.all.WebBrowser.ExecWB(6,1)>
<input type=button value=直接打印 onclick=document.all.WebBrowser.ExecWB(6,6)>
<input type=button value=页面设置 onclick=document.all.WebBrowser.ExecWB(8,1)>
</p>
<p> <input type=button value=打印预览 onclick=document.all.WebBrowser.ExecWB(7,1)>
</center>

//去掉打印时的页眉页脚

//浏览器验证

function checkBrowser()
{
   this.ver=navigator.appVersion
   this.dom=document.getElementById?1:0
   this.ie6=(this.ver.indexOf("MSIE 6")>-1 && this.dom)?1:0;
   this.ie5=(this.ver.indexOf("MSIE 5")>-1 && this.dom)?1:0;
   this.ie4=(document.all && !this.dom)?1:0;
   this.ns5=(this.dom && parseInt(this.ver) >= 5) ?1:0;
   this.ns4=(document.layers && !this.dom)?1:0;
   this.mac=(this.ver.indexOf('Mac') > -1) ?1:0;
   this.ope=(navigator.userAgent.indexOf('Opera')>-1);
   this.ie=(this.ie6 || this.ie5 || this.ie4)
   this.ns=(this.ns4 || this.ns5)
   this.bw=(this.ie6 || this.ie5 || this.ie4 || this.ns5 || this.ns4 || this.mac || this.ope)
   this.nbw=(!this.bw)
   return this;
}

//计算内容宽和高

<SCRIPT language="javascript">
function test(obj)
{
       var range = obj.createTextRange();
       alert("内容区宽度: " + range.boundingWidth
                                                 + "px\r\n内容区高度: " + range.boundingHeight + "px");

}
</SCRIPT>
<BODY>
<Textarea id="txt" height="150">sdf</textarea><INPUT type="button" value="计算内容宽度" onClick="test(txt)">
</BODY>

//无模式的提示框

function modelessAlert(Msg)
{
window.showModelessDialog("javascript:alert(\""+escape(Msg)+"\");window.close();","","status:no;resizable:no;help:no;dialogHeight:height:30px;dialogHeight:40px;");
}

//屏蔽按键

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<noscript><meta http-equiv="refresh" content="0;url=about:noscript"></noscript>
<title>屏蔽鼠标右键、Ctrl+N、Shift+F10、Alt+F4、F11、F5刷新、退格键</title>
</head>
<body>
<script language="Javascript"><!--
//屏蔽鼠标右键、Ctrl+N、Shift+F10、F11、F5刷新、退格键
//Author: meizz(梅花雨) 2002-6-18
function document.oncontextmenu(){event.returnValue=false;}//屏蔽鼠标右键
function window.onhelp(){return false} //屏蔽F1帮助
function document.onkeydown()
{
if ((window.event.altKey)&&
      ((window.event.keyCode==37)||   //屏蔽 Alt+ 方向键 ←
       (window.event.keyCode==39)))   //屏蔽 Alt+ 方向键 →
{
     alert("不准你使用ALT+方向键前进或后退网页！");
     event.returnValue=false;
}
     /* 注：这还不是真正地屏蔽 Alt+ 方向键，
     因为 Alt+ 方向键弹出警告框时，按住 Alt 键不放，
     用鼠标点掉警告框，这种屏蔽方法就失效了。以后若
     有哪位高手有真正屏蔽 Alt 键的方法，请告知。*/
if ((event.keyCode==8) ||                 //屏蔽退格删除键
      (event.keyCode==116)||                 //屏蔽 F5 刷新键
      (event.ctrlKey && event.keyCode==82)){ //Ctrl + R
     event.keyCode=0;
     event.returnValue=false;
     }
if (event.keyCode==122){event.keyCode=0;event.returnValue=false;} //屏蔽F11
if (event.ctrlKey && event.keyCode==78) event.returnValue=false;   //屏蔽 Ctrl+n
if (event.shiftKey && event.keyCode==121)event.returnValue=false; //屏蔽 shift+F10
if (window.event.srcElement.tagName == "A" && window.event.shiftKey)
      window.event.returnValue = false;             //屏蔽 shift 加鼠标左键新开一网页
if ((window.event.altKey)&&(window.event.keyCode==115))             //屏蔽Alt+F4
{
      window.showModelessDialog("about:blank","","dialogWidth:1px;dialogheight:1px");
      return false;
}
}
</script>
屏蔽鼠标右键、Ctrl+N、Shift+F10、Alt+F4、F11、F5刷新、退格键
</body>
</html>

//屏蔽打印

//移动的图层，拖动

<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

//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

//setTimeout增加参数

//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

//检验连接是否有效

//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>

//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

//连接数据库

//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>

//获得参数

<body>
<a href="javascript:location.href=location.href + '?a=1&b=2'">search</a>
<script language="JavaScript">

</script>
</body>

//可编辑SELECT

//设置光标位置

//页内查找

//操作EXECL

//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

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

<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

//细线SELECT

//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

//取得innerText

<SCRIPT LANGUAGE="JavaScript">

</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()"
>

检查链接是否有效

<a href=http://www.itjxue.com onclick="mm(this, 'http://www.itjxue.com/')">test</a>
<script language="javascript">
function getURL(url)
{
var xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
xmlhttp.open("GET",url,false);
xmlhttp.send();
if (xmlhttp.readyState==4) return xmlhttp.Status==200;
return false;
}
function mm(e, url)
{
if(!getURL(e.href)) e.href = url;
}
</script>

判断是否输入值再激活按钮

屏蔽鼠标右键、Ctrl+N、Shift+F10、Alt+F4、F11、F5刷新、退格键

自定义热键（请按a）

自定义热键（请按a）
<SCRIPT language="JavaScript">

</SCRIPT>

下面的是用javascript传递参数。如果本文件为test.htm，如果访问 test.htm?12 则javascript会得到?后的值并用document.all替换iframe的src值。

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