200多个网页javascript技巧收集大汇总！

150.根据标签获得一组对象
var coll = document.all.tags("DIV");
if (coll!=null)
{
for (i=0; i<coll.length; i++)

}//

151.实现打印预览及打印
<OBJECT classid="CLSID:8856F961-340A-11D0-A96B-00C04FD705A2" height=0 id=wb name=wb width=0></OBJECT>
<input type=button value=打印预览 onclick="wb.execwb(7,1)">
<input type=button onClick=document.all.wb.ExecWB(6,1) value="打印">//

152.不通过form，直接通过名字引用对象
<INPUT TYPE="text" NAME="gg" value=aaaaa>
<SCRIPT LANGUAGE="JavaScript">

</SCRIPT>//

153.使鼠标滚轮失效
function document.onmousewheel()
{
return false;
}//

154.创建弹出窗口
<SCRIPT LANGUAGE="JScript">
  var oPopup = window.createPopup();
  var oPopupBody = oPopup.document.body;
  oPopupBody.innerHTML = "Display some <B>HTML</B> here.";
  oPopup.show(100, 100, 200, 50, document.body);
</SCRIPT>//

155.取得鼠标所在处的对象
var obj = document.elementFromPoint(event.x,event.y);//

156.获得左边的对象
<INPUT TYPE="text" NAME="gg"><INPUT TYPE="text" NAME="bb"

onclick="this.previousSibling.value='guoguo'">//

157.定位鼠标
document.all.hint_layer.style.left  = event.x+document.body.scrollLeft+10;
document.all.hint_layer.style.top  = event.y+document.body.scrollTop+10;//

158.向下拉框指定位置添加项目
var op  = document.createElement("OPTION");
document.all.selected_items.children(index).insertAdjacentElement("BeforeBegin",op);
op.text  = document.all.all_items[i].text;
op.value = document.all.all_items[i].value;//

159.判断一个窗口是否已经打开，如果已经打开，则关闭之
var a;
if(a)
a.close();
else
a=window.open('','','');//

160.动态创建一个标签
newElem  = document.createElement("DIV");
newElem.id = "hint_layer";
document.body.appendChild(newElem);
document.all.hint_layer.innerText="guoguo";//

161.标题栏
document.title//

162.背景图片
<body style="BACKGROUND-ATTACHMENT: fixed" background="img/bgfix.gif" ></body>//背景图片不动

<STYLE TYPE="text/css">

</STYLE>//背景图片居中

163.设置透明效果
document.form.xxx.filters.alpha.opacity=0～100//

164.定义方法
var dragapproved=false;
document.onmouseup=new Function("dragapproved = false");//

165.将数字转化为人民币大写形式
function convertCurrency(currencyDigits) {
// Constants:
var MAXIMUM_NUMBER = 99999999999.99;
// Predefine the radix characters and currency symbols for output:
var CN_ZERO = "零";
var CN_ONE = "壹";
var CN_TWO = "贰";
var CN_THREE = "叁";
var CN_FOUR = "肆";
var CN_FIVE = "伍";
var CN_SIX = "陆";
var CN_SEVEN = "柒";
var CN_EIGHT = "捌";
var CN_NINE = "玖";
var CN_TEN = "拾";
var CN_HUNDRED = "佰";
var CN_THOUSAND = "仟";
var CN_TEN_THOUSAND = "万";
var CN_HUNDRED_MILLION = "亿";
var CN_SYMBOL = "人民币";
var CN_DOLLAR = "元";
var CN_TEN_CENT = "角";
var CN_CENT = "分";
var CN_INTEGER = "整";

// Variables:
var integral; // Represent integral part of digit number.
var decimal; // Represent decimal part of digit number.
var outputCharacters; // The output result.
var parts;
var digits, radices, bigRadices, decimals;
var zeroCount;
var i, p, d;
var quotient, modulus;

// Validate input string:
currencyDigits = currencyDigits.toString();
if (currencyDigits == "") {
  alert("Empty input!");
  return "";
}
if (currencyDigits.match(/[^,.\d]/) != null) {
  alert("Invalid characters in the input string!");
  return "";
}
if ((currencyDigits).match(/^((\d{1,3}(,\d{3})*(.((\d{3},)*\d{1,3}))?)|(\d+(.\d+)?))$/) == null) {
  alert("Illegal format of digit number!");
  return "";
}

// Normalize the format of input digits:
currencyDigits = currencyDigits.replace(/,/g, ""); // Remove comma delimiters.
currencyDigits = currencyDigits.replace(/^0+/, ""); // Trim zeros at the beginning.
// Assert the number is not greater than the maximum number.
if (Number(currencyDigits) > MAXIMUM_NUMBER) {
  alert("Too large a number to convert!");
  return "";
}

// Process the coversion from currency digits to characters:
// Separate integral and decimal parts before processing coversion:
parts = currencyDigits.split(".");
if (parts.length > 1) {
  integral = parts[0];
  decimal = parts[1];
  // Cut down redundant decimal digits that are after the second.
  decimal = decimal.substr(0, 2);
}
else {
  integral = parts[0];
  decimal = "";
}
// Prepare the characters corresponding to the digits:
digits = new Array(CN_ZERO, CN_ONE, CN_TWO, CN_THREE, CN_FOUR, CN_FIVE, CN_SIX, CN_SEVEN, CN_EIGHT,

CN_NINE);
radices = new Array("", CN_TEN, CN_HUNDRED, CN_THOUSAND);
bigRadices = new Array("", CN_TEN_THOUSAND, CN_HUNDRED_MILLION);
decimals = new Array(CN_TEN_CENT, CN_CENT);
// Start processing:
outputCharacters = "";
// Process integral part if it is larger than 0:
if (Number(integral) > 0) {
  zeroCount = 0;
  for (i = 0; i < integral.length; i++) {
p = integral.length - i - 1;
d = integral.substr(i, 1);
quotient = p / 4;
modulus = p % 4;
if (d == "0") {
zeroCount++;
}
else {
if (zeroCount > 0)
{
   outputCharacters += digits[0];
}
zeroCount = 0;
outputCharacters += digits[Number(d)] + radices[modulus];
}
if (modulus == 0 && zeroCount < 4) {
outputCharacters += bigRadices[quotient];
}
  }
  outputCharacters += CN_DOLLAR;
}
// Process decimal part if there is:
if (decimal != "") {
  for (i = 0; i < decimal.length; i++) {
d = decimal.substr(i, 1);
if (d != "0") {
outputCharacters += digits[Number(d)] + decimals[i];
}
  }
}
// Confirm and return the final output string:
if (outputCharacters == "") {
  outputCharacters = CN_ZERO + CN_DOLLAR;
}
if (decimal == "") {
  outputCharacters += CN_INTEGER;
}
outputCharacters = CN_SYMBOL + outputCharacters;
return outputCharacters;
}//

166.xml数据岛绑定表格
<html>
<body>
<xml id="abc" src="test.xml"></xml>
<table border='1' datasrc='#abc'>
<thead>
<td>接收人</td>
<td>发送人</td>
<td>主题</td>
<td>内容</td>
</thead>
<tfoot>
<tr><th>表格的结束</th></tr>
</tfoot>
<tr>
<td><div datafld="to"></div></td>
<td><div datafld="from"></div></td>
<td><div datafld="subject"></div></td>
<td><div datafld="content"></div></td>
</tr>
</table>
</body>
</html>

//cd_catalog.xml
<?xml version="1.0" encoding="ISO-8859-1" ?>

<CATALOG>
<CD>
  <TITLE>Empire Burlesque</TITLE>
  <ARTIST>Bob Dylan</ARTIST>
  <COUNTRY>USA</COUNTRY>
  <COMPANY>Columbia</COMPANY>
  <PRICE>10.90</PRICE>
  <YEAR>1985</YEAR>
  </CD>
<CD>
  <TITLE>Hide your heart</TITLE>
  <ARTIST>Bonnie Tyler</ARTIST>
  <COUNTRY>UK</COUNTRY>
  <COMPANY>CBS Records</COMPANY>
  <PRICE>9.90</PRICE>
  <YEAR>1988</YEAR>
  </CD>
<CD>
  <TITLE>Greatest Hits</TITLE>
  <ARTIST>Dolly Parton</ARTIST>
  <COUNTRY>USA</COUNTRY>
  <COMPANY>RCA</COMPANY>
  <PRICE>9.90</PRICE>
  <YEAR>1982</YEAR>
  </CD>
<CD>
  <TITLE>Still got the blues</TITLE>
  <ARTIST>Gary Moore</ARTIST>
  <COUNTRY>UK</COUNTRY>
  <COMPANY>Virgin records</COMPANY>
  <PRICE>10.20</PRICE>
  <YEAR>1990</YEAR>
  </CD>
</CATALOG>
//