常见js函数

/*根据元素ID查找元素*/
function $() {
var elements = new Array();
for (var i = 0; i < arguments.length; i++) {
var element = arguments[i];
if (typeof element == 'string')
element = document.getElementById(element);
    if (arguments.length == 1)
return element;
elements.push(element);
  }
  return elements;
}

/*根据元素ID取得元素*/
function $E(elemid) {
return document.getElementById(elemid);
}

/*根据元素ID取得元素的value*/
function $Vo(elemid) {
return document.getElementById(elemid).value;
}

/*根据元素ID取得元素的innerHTML*/
function $H(elemid) {
return document.getElementById(elemid).innerHTML;
}

/*根据元素ID隐藏该元素*/
function $Hide(id) {
    document.getElementById(id).style.display = 'none';
}

/*根据元素ID显示该元素*/
function $Display(id) {
    document.getElementById(id).style.display = 'block';
}

/*根据元素ID设置该元素为空*/
function $Dlose(id) {
    document.getElementById(id).innerHTML='';
}

/*网页转向*/
function $U(url){
window.location.href=url;
}

/*取字符长度，一个中文字符为两个字节*/
function $Len(str){
return (''+str).replace(/[^\x0000-\xFF00]/gi,'xx').length;
}

//用正则表达式将前后空格用空字符串替代。
function trim(strSrc)
{
return strSrc.replace(/(^\s*)|(\s*$)/g, "");
}

//onkeypress时根据输入类型控制输入字符,"F":浮点型 "I":整型 "D":日期型
function filterKey(sType){
var iKey = window.event.keyCode;

if(sType == "F"){ //浮点型

if(iKey != 45 && iKey != 46 && iKey != 13 && iKey != 11 && !(iKey>=48 && iKey<=57))
window.event.keyCode = 0
else{
if(iKey == 46){
var obj = window.event.srcElement;
if(obj.value.indexOf(".")>=0)
window.event.keyCode = 0;
}
if(iKey == 45){
var obj = window.event.srcElement;
if(obj.value.indexOf("-")>=0)
window.event.keyCode = 0;
else{
window.event.keyCode = 0;
obj.value = "-" + obj.value;
if(obj.onchange != null){
obj.onchange();
}
}
}
}
} //end "F"
else if(sType == "I"){ //整型
if(iKey != 13 && iKey != 45 && iKey != 11 && !(iKey>=48 && iKey<=57))
window.event.keyCode = 0;
else if(iKey == 45){
var obj = window.event.srcElement;
if(obj.value.indexOf("-")>=0)
window.event.keyCode = 0;
else{
window.event.keyCode = 0;
obj.value = "-" + obj.value;
if(obj.onchange != null){
obj.onchange();
}
}
}
} // end "I"
else if(sType == "D"){ //日期型
var obj = window.event.srcElement;
var strDate = obj.value;

if(strDate.length>=10){
window.event.keyCode = 0;
return;
}
else if(strDate.length<4){ //年
if(iKey != 13 && iKey != 11 && !(iKey>=48 && iKey<=57))
window.event.keyCode = 0;
}
else if(strDate.length == 4){ //分隔符
if(iKey != 45 && iKey != 47)
window.event.keyCode = 0;
}
else if(strDate.length>=5){
if( strDate.indexOf("-") > 0 && strDate.indexOf("-") == strDate.lastIndexOf("-")){ //正输入月份
if(strDate.length>=7 && iKey != 45){ //如果长度过长，则退出
window.event.keyCode = 0;
return;
}

if(iKey>=48 && iKey<=57){
var iPos = strDate.indexOf("-");

var iMonth = parseInt("" + strDate.substr(iPos+1,strDate.length-iPos-1) + (parseInt(iKey) - 48));

if(strDate.length>=6 && (iMonth <1 || iMonth > 12)){
window.event.keyCode = 0;
return;
}
}
} // end if("-")
else if( strDate.indexOf("/") > 0 && strDate.indexOf("/") == strDate.lastIndexOf("/")){ //正输入月份
if(strDate.length>=7 && iKey != 47){ //如果长度过长，则退出
window.event.keyCode = 0;
return;
}

if(iKey>=48 && iKey<=57){
var iPos = strDate.indexOf("/");

var iMonth = parseInt("" + strDate.substr(iPos+1,strDate.length-iPos-1) + (parseInt(iKey) - 48));

if(strDate.length >= 6 && (iMonth <1 || iMonth > 12)){
window.event.keyCode = 0;
return;
}
}
} // end if("/")
else if( strDate.indexOf("-") > 0 && strDate.indexOf("-") != strDate.lastIndexOf("-")){ //正输入日期
if(iKey>=48 && iKey<=57){
var iPos = strDate.lastIndexOf("-");
if(strDate.length - iPos > 2){
window.event.keyCode = 0;
return;
}

var iDay = parseInt("" + strDate.substr(iPos+1,strDate.length-iPos-1) + (parseInt(iKey) - 48));

if(iDay > 31){
window.event.keyCode = 0;
return;
}
}
}
else if( strDate.indexOf("/") > 0 && strDate.indexOf("/") != strDate.lastIndexOf("/")){ //正输入日期
if(iKey>=48 && iKey<=57){
var iPos = strDate.lastIndexOf("/");
if(strDate.length - iPos > 2){
window.event.keyCode = 0;
return;
}

var iDay = parseInt("" + strDate.substr(iPos+1,strDate.length-iPos-1) + (parseInt(iKey) - 48));

if(iDay > 31){
window.event.keyCode = 0;
return;
}
}
}

}

if(strDate.charAt(strDate.length-1) == "-" || strDate.charAt(strDate.length-1) == "/"){
if(iKey != 13 && iKey != 11 && !(iKey>=48 && iKey<=57))
window.event.keyCode = 0;
}

if(iKey == 47 || iKey == 45){
if(strDate.indexOf("-") > 0 && iKey == 47)
window.event.keyCode = 0;
if(strDate.indexOf("/") > 0 && iKey == 45)
window.event.keyCode = 0;
}
} // end "D"


}

/*自适应大小*/
function DrawImage(ImgD,_width,_height){
if(!_width) _width=120;
if(!_height) _height=120;
var flag=false;
var image=new Image();
image.src=ImgD.src;
if(image.width>0&&image.height>0){
flag=true;
if(image.width/image.height>=_width/_height){//120/120
if(image.width>_width){  
ImgD.width=_width;
ImgD.height=(image.height*_width)/image.width;
}else{
ImgD.width=image.width;  
ImgD.height=image.height;
}
ImgD.alt=image.width+"X"+image.height;
}
else{
if(image.height>_height){  
ImgD.height=_height;
ImgD.width=(image.width*_height)/image.height;  
}else{
ImgD.width=image.width;  
ImgD.height=image.height;
}
ImgD.alt=image.width+"X"+image.height;
}
}
} 

/*Cookie*/
function setCookie(name,value)
{
    var Days = 365;
    var exp  = new Date();    //new Date("December 31, 9998");
        exp.setTime(exp.getTime() + Days*24*60*60);
        document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();
}
function getCookie(name)
{
    var arr,reg=new RegExp("(^| )"+name+"=([^;]*)(;|$)");
if(arr=document.cookie.match(reg))
return unescape(arr[2]);
else
return null;
}
function delCookie(name)
{
    var exp = new Date();
        exp.setTime(exp.getTime() - 1);
    var cval=getCookie(name);
        if(cval!=null)
        document.cookie= name + "="+cval+";expires="+exp.toGMTString();
}

/*验证数字*/
function isNumber(e){
var number = "1234567890";
for(var i=0; i<e.length; i++){
if (number.indexOf(e.charAt(i))<0) {
return false;
}
}
return true;
}

/*验证数字*/
function isAllDigits(argvalue) {
    argvalue = argvalue.toString();
    var validChars = "0123456789";
    var startFrom = 0;
    if (argvalue.substring(0, 2) == "0x") {
       validChars = "0123456789abcdefABCDEF";
       startFrom = 2;
    } else if (argvalue.charAt(0) == "0") {
       validChars = "01234567";
       startFrom = 1;
    } else if (argvalue.charAt(0) == "-") {
        startFrom = 1;
    }
   
    for (var n = startFrom; n < argvalue.length; n++) {
        if (validChars.indexOf(argvalue.substring(n, n+1)) == -1) return false;
    }
    return true;
}

/*检查Email是否合法*/
function isEmail(s){
    if (s.length<7||s.length > 50){
            return false;
    }
     var regu = "^(([0-9a-zA-Z]+)|([0-9a-zA-Z]+[_.0-9a-zA-Z-]*[0-9a-zA-Z]+))@([a-zA-Z0-9-]+[.])+([a-zA-Z]{2}|net|NET|com|COM|gov|GOV|mil|MIL|org|ORG|edu|EDU|int|INT)$"
     var re = new RegExp(regu);
     if (s.search(re) != -1) {
           return true;
     } else {
           return false;
     }
}

/*检查字符串是否为Null*/
function isNull(s){
    if (s == null || s.length <= 0 || s.trim() == ""){
            return true;
    }
    return false;
}

/*检查字符串是否为空*/
function isEmpty(s){
    if (s == null || s.length <= 0 || s.trim() == ""){
            return true;
    }
    return false;
}

/*检查日期是否合法*/
function isValidDate(day, month, year) {
    if (month < 1 || month > 12) {
            return false;
        }
        if (day < 1 || day > 31) {
            return false;
        }
        if ((month == 4 || month == 6 || month == 9 || month == 11) &&
            (day == 31)) {
            return false;
        }
        if (month == 2) {
            var leap = (year % 4 == 0 &&
                       (year % 100 != 0 || year % 400 == 0));
            if (day>29 || (day == 29 && !leap)) {
                return false;
            }
        }
        return true;
    }

/*获得Radio的值*/
function getRadioValue(name){
var radios = document.getElementsByName(name);
var i;  
if (null == radios.length){
  if(radios.checked) {
  return radios.value;
  }
}
    for(i = 0; i < radios.length; i++){
       if(radios[i].checked){
     return radios[i].value;
       }
    }
    return 0;
}

/*设置Radio的值*/
function setRadioValue(name,value){
var radios = document.getElementsByName(name);
var i;
if (null == radios.length){
  if(radios.checked) {
  radios.checked = "checked";
  }
}
    for(i=0;i<radios.length;i++){
       if(value == radios[i].value){
     radios[i].checked = "checked";
       }
    }
    return 0;
}

/*获得CheckBox的值,多个为数组*/
function getCheckBoxValues(name){
var values = new Array();
var cbs = document.getElementsByName(name);
var i;  
if (null == cbs) return values;  
if (null == cbs.length){
  if(cbs.checked) {
  values[values.length] = cbs.value;
  }
  return values;
}    
var count = 0 ; 
for(i = 0; i<cbs.length; i++){
if(cbs[i].checked){
values[values.length] = cbs[i].value;
}
}
return values;
}

/*设置CheckBox的值*/
function setCheckBoxValue(name,value){
var cbs = document.getElementsByName(name);
var i;
    if (null == cbs) return 0 ;
  if (null == cbs.length){
  cbs.checked = value;
  return 0;
  }
for(i=0;i<cbs.length;i++){
  cbs[i].checked = value;
  }
  return 0;
}

/*设置CheckBox选中状态*/
function setCheckBoxs(name,value){
var cbs = document.getElementsByName(name);
var i;
    if (null == cbs) return 0 ;
  if (null == cbs.length){
  cbs.checked = true;
  return 0;
  }
for(i=0;i<cbs.length;i++){
if(cbs[i].value == value){
cbs[i].checked = true;
}
  }
  return 0;
}

function htmlEncode(text) {
return text.replace(/&/g, '&amp;').replace(/"/g, '&quot;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
}

var Request = new Object();
Request.send = function(url, method, callback, data, urlencoded) {
    var req;
    if (window.XMLHttpRequest) {
        req = new XMLHttpRequest();
        if (req.overrideMimeType) {
req.overrideMimeType('text/xml');
}
    } else if (window.ActiveXObject) {
        req = new ActiveXObject("Microsoft.XMLHTTP");
    }
    req.onreadystatechange = function() {
        if (req.readyState == 4) {
            if (req.status < 400) {
                (method=="POST") ? callback(req) : callback(req,data);
            } else {
            }
        }
    }
    if (method=="POST") {
        req.open("POST", url, true);
        if (urlencoded) req.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
        req.send(data);
    } else {
        req.open("GET", url, true);
        req.send(null);
    }
   // return req;
}

Request.sendRawPOST = function(url, data, callback) {
    Request.send(url, "POST", callback, data, false);
}
Request.sendPOST = function(url, data, callback) {
    Request.send(url, "POST", callback, data, true);
}
Request.sendGET = function(url,callback) {
    Request.send(url, "GET", callback, null, null);
}

/*分析status文件的内容*/
function parseResponseStatus(documentElement){
     var dataobj = new Object();
//parse status
var status = documentElement.getElementsByTagName("status");
if(status && status.length > 0){
if(status[0].firstChild){
dataobj.status = status[0].firstChild.nodeValue;
}
else{
dataobj.status = "";
}
}
return dataobj;
}

//提交form，把得到的数据放在指定的ID上.
function ajaxFormRequest(datastr) {

eval("var obj = "+datastr+";");
if (obj.id == null)
  obj.id = "输入自定义id";
  disableBtn();
dojo.io.bind({
url: parseUrl(obj.url),
useCache: false,
preventCache: false,
encoding:'UTF-8',
load: function(type, data, evt) {
$E(obj.id).innerHTML = data;
enableBtn();
},
error: function(type, error) { alert("error");},
mimetype: "text/plain",
formNode: $E(obj.form)
});
}

//提交form，执行load方法
function ajaxRequestLoad(datastr) {

eval("var obj = "+datastr+";");
if (obj.id == null)
  obj.id = "输入自定义id";
  disableBtn();
dojo.io.bind({
url: parseUrl(obj.url),
useCache: false,
preventCache: false,
encoding:'UTF-8',
load: obj.load,
error: function(type, error) { alert("error");},
mimetype: "text/plain",
formNode: $E(obj.form)
});
}

/*金额标签转换函数*/
function money_convert(name){

var formatName = name  + "_format";
var strValue = document.getElementById(formatName).value;
    strValue=strValue.replace(",","");
    var regex = /^(0(\.\d{0,2})?|([1-9]+[0]*)+(\.\d{0,2})?)$/;
    if(!regex.test(strValue)){
    //alert("金额格式不正确!");
    document.getElementById(name).value=0;
    document.getElementById(formatName).value=0;
    }else{
     
strValue = Math.round(parseFloat(strValue)*1000+0.001);
      document.getElementById(name).value=strValue;
    }
}

/*金额标签转换函数
* 获得焦点时,去掉金额中的','符号
*/
function prepare(obj){
var strValue = obj.value;
strValue=strValue.replaceAll(",","");
obj.value = strValue;
obj.select();
}

String.prototype.replaceAll  = function(s1,s2){   
return this.replace(new RegExp(s1,"gm"),s2);   
}  

/*日期标签转换函数*/
function setDate(name){
var formatName = "format_" + name;
var tempDate = document.getElementById(name).value;
var validateDate = dojo.widget.byId(formatName).inputNode.value;
var regex = /^[1-9]{1}\d{3}-\d{1,2}-\d{1,2}$/;
if(regex.test(validateDate)){
var dateString = validateDate.split("-");
var year = dateString[0];
var month = dateString[1];
var day = dateString[2];
if(testMonth(month)&&testDay(year,month,day)){
document.getElementById(name).value=validateDate;
return;
}
}

if(validateDate==""){
tempDate="";
}
dojo.widget.byId(formatName).inputNode.value=tempDate;
document.getElementById(name).value=tempDate;
}

function testMonth(month){
if (month < 1 || month > 12)  
    {               
        alert("月份应该为1到12的整数");
        return false;  
    }
    return true;
}
function testDay(year,month,day){
    if (day < 1 || day > 31)  
    {  
        alert("每个月的天数应该为1到31的整数");
        return false;  
    }       
    if ((month==4 || month==6 || month==9 || month==11) && day==31)  
    {  
        alert("该月不存在31号"); 
        return false;  
    }       
    if (month==2)  
    {  
        var isleap=(year % 4==0 && (year % 100 !=0 || year % 400==0));  
        if (day>29)  
        {                 
            alert("2月最多有29天"); 
            return false;  
        }  
        if ((day==29) && (!isleap))  
        {                 
            alert("闰年2月才有29天"); 
            return false;  
        }  
    }  
    return true; 
}
//比较两个日期是否有效(第一个日期不能在大于第二个日期);第一个日期可以为空,当为空时不进行验证
function compareTwoDate(startDate,endDate,s){
var a=startDate;
var b=endDate;
if(startDate==""){
return true;
}
if(((Number(a.substring(0,4))-Number(b.substring(0,4)))*356+
       (Number(a.substring(5,7))-Number(b.substring(5,7)))*31+
    (Number(a.substring(8,10))-Number(b.substring(8,10))))>0){
  alert(s);
  //startDate.focus();
  return false;
}
return true;
}
//比较两个日期时间是否有效(第一个日期时间不能在大于第二个日期时间);第一个日期时间可以为空,当为空时不进行验证
function compareTwoDateTime(startDate,endDate,startTime,endTime,s){
var a=startDate;
var b=endDate;
var at = startTime;
var bt = endTime;
if(startDate==""){
return true;
}
if(((Number(a.substring(0,4))-Number(b.substring(0,4)))*356*24*3600+
       (Number(a.substring(5,7))-Number(b.substring(5,7)))*31*24*3600+
    (Number(a.substring(8,10))-Number(b.substring(8,10)))*24*3600+
    (Number(at.substring(0,2))-Number(bt.substring(0,2)))*3600+
    (Number(at.substring(3,5))-Number(bt.substring(3,5)))*60+
    (Number(at.substring(6))-Number(bt.substring(6)))>0)){
  alert(s);
  return false;
  //startDate.focus();
}
return true;
}
//验证时间是否合法.
function testTime(time){
var regex = /^[0-2]{1}[0-9]{1}:[0-5]{1}[0-9]{1}:[0-5]{1}[0-9]{1}$/;
if(!regex.test(time)){
alert("您输入的时间格式不正确!");
return false;
}
var hour = time.substring(0,2);
var minute = time.substring(3,5);
var second = time.substring(6);
if(hour>23 || hour <0){
alert("小时的值应该在0-23之间!");
return false;
}
if(minute > 60 ||minute < 0){
alert("分钟的值应该在0-59之间!");
return false;
}
if(second > 60 ||second < 0){
alert("秒钟的值应该在0-59之间!");
return false;
}
return true;
}

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

function sendmoneycheck(path,orderSeqid) {
var password = document.getElementById('password').value;
        if(document.getElementById('password').value==null || document.getElementById('password').value=='') {
alert('取款密码必须输入');
} else {
var url = path+'/sendmoney/managerecconfirmsendmoney.htm?orderSeqid='+orderSeqid+'&passwd='+document.getElementById('password').value;

ajaxFormRequest('{url:"'+url+'",id:"paginationResult"}');
$E('buttonconfirm').disabled=true;
}
}


function isUrlValidate(url){
var regx = /^(\s)*(http(s)?:\/\/)?([\w-]+\.)+[\w-]+(:(\d{1,4}))?(\/[\w-.\/?%&=]*)?(\s)*$/;
return regx.test(url);
}

function isDateValidate(strDate){
var regx = /^([1-2]\d{3})[\/|\-](0?[1-9]|10|11|12)[\/|\-]([1-2]?[0-9]|0[1-9]|30|31)$/;
return regx.test(strDate);
}

function isEmailValidate(email){
var regx = /^(\s)*([\w]+([-_.][\w]+)*@[\w]+([.][\w]+)*\.[\w]+([.][\w]+)*)(\s)*$/;
return regx.test(email);
}

function isPhoneValidate(tel){
var regx = /^(\s)*((1[35]\d{9})|((0\d{2,3}\-){1}[1-9]{1}\d{6,7}(\-\d{1,4})?))(\s)*$/;

return regx.test(tel);
}

function isMobileValidate(tel){
var regx = /^(\s)*(1[35]\d{9})(\s)*$/;

return regx.test(tel);
}

function dateCompare(date1, date2){
date1 = date1.replace(/-/g, "/");
date2 = date2.replace(/-/g, "/");

try{
return Date.parse(date1) - Date.parse(date2);
}
catch(e){
return 0;
}
}


function respond(obj){
if(window.event.keyCode==13){
obj.onblur();
}
}

function parseUrl(url){

var uniqueKey = new Date();
if(url != null && url.indexOf("?") > 0){
url += "&uniqueKey=" + uniqueKey;
}
else{
url += "?uniqueKey=" + uniqueKey;
}
return url;
}

function disableBtn(){
var oBtns = document.getElementsByName("BTN_QRY");

if(oBtns != null && oBtns.length > 0){
for(var i=0; i<oBtns.length; i++){
oBtns[i].disabled = true;
}
}
}

function enableBtn(){

var oBtns = document.getElementsByName("BTN_QRY");

if(oBtns != null && oBtns.length > 0){
for(var i=0; i<oBtns.length; i++){
oBtns[i].disabled = false;
}
}
}

都是你自己写的吗？的确挺实用的。