我收藏/更新的JavaScript/DHTML代码.(随时更新)

1.删除一元素,如button,等表单元素.一种根据index,一种根据id

<HEAD>
<SCRIPT>
function removeElementById()
{
var oChild=form1.children('txt1');
if (oChild != null)
{
form1.removeChild(oChild);
}
}
function removeElementByIndex()
{
var oChild=form1.children(0);
if (oChild != null)
{
form1.removeChild(oChild);
}
}
</SCRIPT>
</HEAD>
<BODY>

</BODY>
2.循环显示数组的内容,各组显示的时间长度可以设置(以秒为单位) 2005-09-13

方法一
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
</HEAD>

<BODY>
<div id="div1" ></div>
<div id="div2" ></div>
<script>
var array1 = new Array();
array1[0] = new Array();
array1[1] = new Array();
array1[2] = new Array();
array1[0][0] = "内容1";
array1[0][1] = "背景音乐1";
array1[0][2] = 1000;//持续时间

array1[1][0] = "内容2";
array1[1][1] = "背景音乐2";
array1[1][2] = 2000;//持续时间

array1[2][0] = "内容3";
array1[2][1] = "背景音乐3";
array1[2][2] = 3000;//持续时间

setTimeout("show(0)",0);//这里的0是用来设置第一一运行的延时.

<BODY onLoad="loadshow();">
<div id="div1" ></div>
<div id="div2" ></div>
<script>
var array1 = new Array();
array1[0] = new Array();
array1[1] = new Array();
array1[2] = new Array();
array1[0][0] = "内容1";
array1[0][1] = "背景音乐1";
array1[0][2] = 1000;//持续时间

array1[1][0] = "内容2";
array1[1][1] = "背景音乐2";
array1[1][2] = 1000;//持续时间

array1[2][0] = "内容3";
array1[2][1] = "背景音乐3";
array1[2][2] = 1000;//持续时间

        function loadshow()
        {
         setTimeout("show(0)",0);
        }

</HEAD>
<FORM METHOD=POST ACTION="" name ="myForm">
<input type="button" onclick="doPreview()" value= "preview">
</FORM>
<BODY>

</BODY>
</HTML>
display:none/block 不拉屎不占茅坑.
visibility:hidden/visible 拉不拉屎都占着茅坑

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
</HEAD>
<BODY>
<SELECT NAME="select1" id="select1" onchange="doChange()">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</SELECT>
<div id ="div1" style ="visibility:hidden"><p align="center">一、合同变更<BR></div>
<div id ="div2" style ="visibility:hidden"><p align="center">二、费用变更</p></div>
<div id ="div3" style ="visibility:hidden"><p align="center">三、其它变更</p></div>
<script>
function doChange()
{
  var sel = select1.options[select1.selectedIndex].value
  if (sel == "1")
  {
   div1.style.visibility = "visible";
   div2.style.visibility = "hidden";
   div3.style.visibility = "hidden";
  }
  else if (sel =="2")
  {
   div1.style.visibility = "hidden";
   div2.style.visibility = "visible";
   div3.style.visibility = "hidden";
  }
  else
  {
   div1.style.visibility = "hidden";
   div2.style.visibility = "hidden";
   div3.style.visibility = "visible";
  }
}
doChange();
</script>
</BODY>
</HTML>
客户端实现剪贴板功能            2005-09-17
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
<SCRIPT LANGUAGE="JavaScript">
<!--
function JM_cc(ob)
{
var obj=MM_findObj(ob);

if (obj)
{
obj.select();js=obj.createTextRange();js.execCommand("Copy");}
alert('复制成功，粘贴发给你好友一起听，谢谢!');
}

function MM_findObj(n, d) { //v4.0
var p,i,x;
if(!d) d=document;
if((p=n.indexOf("?"))>0&&parent.frames.length)
   {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);
   }
if(!(x=d[n])&&d.all) x=d.all[n];
for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
if(!x && document.getElementById) x=document.getElementById(n); return x;
}

//-->
</SCRIPT>
</HEAD>

<BODY>

<span class="style1"><strong>本专辑地址</strong></span> <input name="textarea1" type="text" style="background-color:#F8F0DC" value="http://www.5c5t.com/MusicList/beed13602b9b0e6ecb5b568ff5058f077ting.htm? 崔健的专辑《新长征路上的摇滚》，来听听，不错。"
size="30" maxlength="100">
<input type="button" name="Button" value="点此复制给好友"style="background-color:#FFCC66" onClick=JM_cc('textarea1')>
</BODY>
</HTML>
上传前客户端判断图片宽和高 2005-09-18更新

<input type="button" onclick="go()" value="picSize">
</body>
</html>
原来的有个问题，宽度很大的图片反复测试的时候不准确，好象有个延时问题。已经修改了。再不`行这：
<input type="button" onclick="setTimeout('go()',1000);" value="picSize">

<tr onmouseover="????????">
<td><img src="images/red.gif" width="3" height="3"></td>
<td>asdfasdf</td>
</tr>
如上，该怎么写才能实现鼠标移到这行时改变第一个<td>里的图片，(收集)

<tr onmouseover="this.children[0].children[0].src='aaa.gif';">

下拉列表获得焦点的时候自动展开它 2005-10-27

http://www.51js.com/viewthread.php?tid=28253
有一个不好的地方就是需要服务器允许创建对象，拿回自己本机测试吧。
<SELECT id=cboSort onfocus="demo()">
<OPTION value=None selected>None</OPTION>
<OPTION value=col1>序号</OPTION>
<OPTION value=col2>抄表册</OPTION>
<OPTION value=col3>抄表册名称</OPTION>
<OPTION value=col4>抄表册性质</OPTION>
<OPTION value=col5>抄表周期</OPTION>
<OPTION value=col6>管理部门</OPTION>
<OPTION value=col7>变压器组号</OPTION>
<OPTION value=col8>变压器性质</OPTION>
<OPTION value=col9>抄表员代码</OPTION>
<OPTION value=col10>抄表员姓名</OPTION>
<OPTION value=col11>抄表列日</OPTION>
<OPTION value=col12>浮动天数</OPTION>
<OPTION value=col13>初始化标志</OPTION>
<OPTION value=col14>缴费天数</OPTION>
<OPTION value=col15>抄表方式</OPTION>
</SELECT>

tf = fso.CreateTextFile("c:\\testfile.txt", true);

tf.WriteLine("Testing 1, 2, 3.") ;

tf.WriteBlankLines(3) ;

tf.Write ("This is a test.");

tf.Close();
}
</script>

</head>

<body>
<form>
        <input type=button value='aa' onclick=aa() />
   </form>
</body>
</html>

客户端获得CheckBox的值

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
</HEAD>
<SCRIPT LANGUAGE="JavaScript">
<!--
//通过getElementByTag
function getCbxByTag()
{
     var cbx = document.getElementsByTagName("input");
var cbxValue="";
for(var i=0;i<cbx.length;i++)
{
  if(cbx[i].type =="checkbox")
  {
   if (cbx[i].checked)
   {
    if (cbxValue.length>0)
    {

     cbxValue += ","+cbx[i].value;
    }
    else
    {
        cbxValue = cbx[i].value ;
    }
   }
  }
}
alert(cbxValue);
return false;
}

//通过getElementsByName
function getCbxByName()
{
     var cbx = document.getElementsByName("ff");
var cbxValue="";
for(var i=0;i<cbx.length;i++)
{
  if (cbx[i].checked)
  {
   if (cbxValue.length>0)
   {

    cbxValue += ","+cbx[i].value;
   }
   else
   {
    cbxValue = cbx[i].value ;
   }
  }
}
alert(cbxValue);
return false;
}

//使用了数组的getElementsByName
function mm()
{
    var a = document.getElementsByName("ff");
    var s = [];
    for(var i=0; i<a.length; i++)
    {
        if(a[i].type=="checkbox" && a[i].checked)
        {
            s[s.length] = a[i].value;
        }
    }
    alert(s);

}

//-->
</SCRIPT>
<BODY>
<form name="form" id="form" method="post" onsubmit="JavaScript:return getCbxByTag();">
<input name="ff" type="checkbox" id="ff1" value="1">1
<input name="ff" type="checkbox" id="ff2" value="2">2
<input name="ff" type="checkbox" id="ff3" value="3">3
<input name="ff" type="checkbox" id="ff4" value="4">4
<input type="submit" name="Submit" value="提交">
<input type="button" name="buttun2" value="提交2" onclick="return getCbxByName()">
    <input type="button" name="buttun2" value="提交3" onclick="mm()">
</form>
</BODY>
</HTML>
获得ChexBox 的Text
  //通过getElementByTag
function getCbxByTag()
{
var cbx = document.getElementsByTagName("input");
var cbxValue="";
var cbxText = "";
for(var i=0;i<cbx.length;i++)
{
if(cbx[i].type =="checkbox")
{
   if (cbx[i].checked)
   {
    if (cbxValue.length>0)
    {

     cbxValue += ","+cbx[i].value;
     cbxText += "," +cbx[i].nextSibling.innerText;
    }
    else
    {
        cbxValue = cbx[i].value ;
        cbxText = cbx[i].nextSibling.innerText;
    }
   }
}
}
alert(cbxValue);
alert(cbxText);
return false;
}

CSS样式里使用JavaScript(onmouseover/onmouseout) 2005-11-05

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> CSS样式里使用JavaScript(onmouseover/onmouseout)2</TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">

<BODY>
<TABLE >
<TR >
<TD >风儿吹散了蒲公英......    </TD>
<TD>风儿吹散了蒲公英......   </TD>
<TD>风儿吹散了蒲公英......   </TD>
</TR>
<TR >
<TD >风儿吹散了蒲公英......    </TD>
<TD>风儿吹散了蒲公英......   </TD>
<TD>风儿吹散了蒲公英......   </TD>
</TR>
</TABLE>
</BODY>
</HTML>

getElementsByTagName获得所有CheckBox值.加了一个属性value

<!--

function getCheckBoxValue()

{

var cbxs = document.getElementsByTagName("input");

var strValue = "";

for(var i=0;i<cbxs.length;i++)

{

if(cbxs[i].type == "checkbox" && cbxs[i].checked == true)

{

if(strValue.length == 0)

{

strValue = cbxs[i].value;

}

else

{

strValue += ","+cbxs[i].value;

}

alert(strValue);

}

//-->

</SCRIPT>

javascript实现网页对联广告
 http://maxie.cnblogs.com/archive/2005/12/22/302475.html

function initEcAd() {

document.all.AdLayer1.style.posTop = -200;

document.all.AdLayer1.style.visibility = 'visible'

document.all.AdLayer2.style.posTop = -200;

document.all.AdLayer2.style.visibility = 'visible'

MoveLeftLayer('AdLayer1');

MoveRightLayer('AdLayer2');

}

function MoveLeftLayer(layerName) {

var x = 5;

var y = 100;

var diff = (document.body.scrollTop + y - document.all.AdLayer1.style.posTop)*.40;

var y = document.body.scrollTop + y - diff;

eval("document.all." + layerName + ".style.posTop = y");

eval("document.all." + layerName + ".style.posLeft = x");

setTimeout("MoveLeftLayer('AdLayer1');", 20);

}

function MoveRightLayer(layerName) {

var x = 5;

var y = 100;

var diff = (document.body.scrollTop + y - document.all.AdLayer2.style.posTop)*.40;

var y = document.body.scrollTop + y - diff;

eval("document.all." + layerName + ".style.posTop = y");

eval("document.all." + layerName + ".style.posRight = x");

setTimeout("MoveRightLayer('AdLayer2');", 20);

}

document.write("<div id=AdLayer1 style='position: absolute;visibility:hidden;z-index:1'><EMBED src='http://ad4.sina.com.cn/200512/21/41477_58550news_guonei_ditong_1222.swf' quality=high WIDTH=100 HEIGHT=280 TYPE='application/x-shockwave-flash' id=EccoolAd></EMBED></div>"

+"<div id=AdLayer2 style='position: absolute;visibility:hidden;z-index:1'><EMBED src='http://ad4.sina.com.cn/200512/21/41477_58550news_guonei_ditong_1222.swf' quality=high WIDTH=100 HEIGHT=280 TYPE='application/x-shockwave-flash' id=EccoolAd></EMBED></div>");

initEcAd()

页面正在价载.....
http://www.iconcc.net/d/lbs/article.asp?id=422

<html>

<head>

/*Loader

----------------------------------------------*/

#loader_container {

text-align:center;

position:absolute;

top:60%;

width:100%;

left: 0;

}

#loader {

font-family:Tahoma, Helvetica, sans;

font-size:11.5px;

color: #abc;

background-color:#000;

padding:10px 0 16px 0;

margin:0 auto;

display:block;

width:130px;

border:1px solid #abc;

text-align:left;

z-index:2;

}

#loader_bg {background-color: #abc;

position:relative;

top:8px;

left:8px;

height:7px;

width:113px;

font-size:1px}

#progress {

height:5px;

font-size:1px;

width:1px;

position:relative;

top:1px;

left:0px;

background-color: #fff;

}

</style>

var t_id = setInterval(animate,20);

var pos=0;

var dir=2;

var len=0;

function animate()

{

var elem = document.getElementById('progress');

if(elem != null) {

if (pos==0) len += dir;

if (len>32 || pos>79) pos += dir;

if (pos>79) len -= dir;

if (pos>79 && len==0) pos=0;

elem.style.left = pos;

elem.style.width = len;

}

function remove_loading() {

this.clearInterval(t_id);

var targelem = document.getElementById('loader_container');

targelem.style.display='none';

targelem.style.visibility='hidden';

}

</script>

</head>

<div align="center">网页正在载入中

</div>

</div>

<p>在Flickr找的</p>

</body>

</html>

定义方法的方式

//去掉左右空格
String.prototype.trim = function()
{
return this.replace(/(^\s*)|(\s*$)/g, "");
}
//去掉左空格
String.prototype.ltrim = function()
{
return this.replace(/(^\s*)/g, "");
}
//去掉左右空格
String.prototype.rtrim = function()
{
return this.replace(/(\s*$)/g, "");
}
//使用方法:
var returntxt =" 你好我好 ";
alert(returntxt);
alert(returntxt.ltrim());
alert(returntxt.rtrim());
alert(returntxt.trim());

重载(OverLoad)和覆盖(Override)
“参数必须不同”是指参数的个数或者类型不相同，和参数顺序无关。
http://www.cnblogs.com/Terrylee/archive/2006/03/09/346128.html

使用 this 指针和 prototype 实现 js 的 OO 时的一个区别 2006-04-26
利用 this 实现的公共方法中可以访问类的私有成员(用 var 声明的变量)，私有方法(用 function 直接定义的方法)；
利用原型扩展实现的方法中，无法调用私有成员和变量。
例子如下所示（把其中注释掉的两行恢复就可以看到区别）：

function T(name) {
    this.Name = name;
    var x = 5;

    function privateFunc() {
        alert('in private method: do sometheing');
    }

    this.PublicFunc = function() {
        // 可以调用私有方法，访问私有成员变量。
        privateFunc();
        alert('x = ' + x);
        alert('in public method: do something else.');
    }
}

//var t = new T('t1');
//t.PublicFunc();

T.prototype.PublicFunc2 = function() {
    alert('in public method 2.');
    // 下面两行都会出错。在利用 prototype 扩展的方法里无法调用对象的私有方法，也访问不到通过 var 定义的私有成员。
    // alert(x);
    // privateFunc();
}

var t2 = new T('t2');
t2.PublicFunc();
t2.PublicFunc2();

我知道了，在html中加上下面语句
function clickbutton()
{
     if(event.keyCode==13)
     {
window.document.all.Button1.click(); //将Button1改为相应的Button就行了
     }
}
</script>
</HEAD>
<body MS_POSITIONING="GridLayout" onkeydown="if(event.keyCode==13) return false;">
谢谢各位的响应！

去掉左右空格设置SELECT的选项目.

<script language ="javascript">
    function SetAllWorkType(Value)
    {
          var cbx = document.getElementsByTagName("select");
         //var cbx = document.all.select;
          Value.trim();
         // alert(Value.length + Value);
          if(Value == "-1") return;
          for(var i=0;i<cbx.length;i++)
          {
              if(cbx[i].id !="DdlWork" && cbx[i].id !="DdlACCOUNTABILITY"
                    && cbx[i].id !="DdlABILITY"&& cbx[i].id !="DdlTEAMWORK"&& cbx[i].id !="DdlQUALITY"
                    && cbx[i].id !="DdlSATISFACTION" )

              {
                    cbx[i].value = Value;
              }
          }
    }

String.prototype.trim = function() {
return this.replace(/(^\s*)|(\s*$)/g,"")
};

</script>

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