当前位置：首页 > 资讯 > 技术文档

javascript 应用小技巧方法汇总

时间：2021-04-06 20:33 编辑：来源：阅读：
扫一扫，手机访问

摘要：javascript 应用小技巧方法汇总

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

[url=http://([\w-]+\.)+[\w-]+(/[\w]http://([\w-]+\.)+[\w-]+(/[\w[/url]- ./?%&=]*)? 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

[url=http://www.meadroid.com/scriptx/docs/printdoc.htm?static]

//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;}<!--用本样式在打印时隐藏非打印项目--> 
.PageNext{page-break-after: always;}<!--控制分页--> </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

<script language="JavaScript">  var HKEY_Root,HKEY_Path,HKEY_Key; 
HKEY_Root="HKEY_CURRENT_USER"; 
HKEY_Path="\\Software\\Microsoft\\Internet Explorer\\PageSetup\\"; 
//设置网页打印的页眉页脚为空 function PageSetup_Null() { try { 
     var Wsh=new ActiveXObject("WScript.Shell");  HKEY_Key="header"; 
 Wsh.RegWrite(HKEY_Root+HKEY_Path+HKEY_Key,"");  HKEY_Key="footer"; 
 Wsh.RegWrite(HKEY_Root+HKEY_Path+HKEY_Key,""); } catch(e){} } //设置网页打印的页眉页脚为默认值 function PageSetup_Default() {  try 
{  var Wsh=new ActiveXObject("WScript.Shell");  HKEY_Key="header"; 
 Wsh.RegWrite(HKEY_Root+HKEY_Path+HKEY_Key,"&w&b页码,&p/&P"); 
 HKEY_Key="footer"; 
 Wsh.RegWrite(HKEY_Root+HKEY_Path+HKEY_Key,"&u&b&d"); } catch(e){} } </script> 
<input type="button" value="清空页码" onclick=PageSetup_Null()> 
<input type="button" value="恢复页码" onclick=PageSetup_Default()>

//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 <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

[u]复制代码[/u][/url] 代码如下:

//自定义的apply,call

[url=http://ServerName/VDir/TstResult.asp",false]http://ServerName/VDir/TstResult.asp",false[/url] 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

[url=javascript:location.href=location.href + ] <script language="JavaScript">  </script> </body>

//可编辑SELECT

[u]复制代码[/u][/url] 代码如下:

//设置光标位置

[url=#]

//插入文字

[u]复制代码[/u][/url] 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

[u]复制代码[/u] 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。

全部评论(0)

上一篇：window.open被浏览器拦截后的自定义提示效果代码
下一篇：Bootstarp 基础教程之表单部分实例代码

资讯排行榜
更多>>