JavaScript常用函数

0、过滤html标记

str.match(/<a[^>]*>[\s\S]*?<\/a>/ig);

 

 

 

1、JavaScript删除字符串前后的空格

 

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

 

 

2、JavaScript判断是否是数字（功能相当于isNaN）

 

function isNumber(str)
{
    var patt=/^\d+(\.\d+)?$/;
    return patt.test(str);
}

 

 

4、JavaScript判断email地址格式

 

function isEmail(str)
{
    var patt=/^([\w.-])+\@(([\w-])+\.)+([a-zA-Z0-9]{2,4})+$/;
    return patt.test(str);
}

 

 

 

5、触发某对象的click事件

 

//可直接用：document.getElementById('object').onclck(); //记得带上on

    function clickIt(elementId)
    {
    var ele=document.getElementById(elementId);
    ele.onclick.call(ele);
    }

 

 

6、getBrowserType() //可以用全局变量 var isIE=document.all?true:false;

 

function getBrowserType()
{
 var patt=/Microsoft/i;
 if(patt.test(window.navigator.appName)) return "IE";
 patt=/Netscape/i;
 if(patt.test(window.navigator.appName)) return "FF";
 return "";
}

 

 

8、给对象添加事件

 

function addObjectEvent(objID,eventName,eventFunc)
{
    var theObj=document.getElementById(objID);
    if(window.attachEvent)//IE
    {
     theObj.attachEvent(eventName,eventFunc);
    }
    else if(window.addEventListener)//FireFox
    {
     eventName = eventName.toString().replace(/on(.*)/i,'$1');
     theObj.addEventListener(eventName,eventFunc,true);
    } 
}    
addObjectEvent('the object id','onclick',show);

function show()
{
  alert('ok');
}

Note:

IE: attachEvent, detachEvent

FF: addEventListener, removeEventListener

 

 

9、给对象移除事件

 

function removeObjectEvent(objID,eventName,eventFunc)
{
    var theObj=document.getElementById(objID);
    if(window.detachEvent)//IE
    {
     theObj.detachEvent(eventName,eventFunc);
    }
    else if(window.removeEventListener)//FireFox
    {
     eventName = eventName.toString().replace(/on(.*)/i,'$1');
     theObj.removeEventListener(eventName,eventFunc,true);
    } 
} 

removeObjectEvent('the object id','onclick',show);

function show()
{
  alert('ok');
}

11、进制转换


/*
* 任意进制转10进制
* 参数num表示待转换的数
* 参数str表示待转换的进制的具体信息,如标准2进制为"01",标准8进制为"01234567"
*/
function toDec(num, str) {
    var r = 0;
    for(var i = num.length - 1, j = 0; i >= 0; i--, j++) {
        var t = str.indexOf(num.charAt(i));
        if(t == -1) return "error";
        r += t * Math.pow(str.length, j);
    }
    return r;
}

 

 

/*
* 10进制转任意进制
*/

function carrybit(num, str) {
    var r = "";
    if(str.length > 1) {
        if(num >= str.length) {
            r += carrybit(Math.floor(num / str.length), str);
            r += carrybit(num % str.length, str);
        } else {
            r = str.substr(num, 1);
        }
    }
    return r;
}

 

 

12、money格式化

 

alert(formatMoney('123456789.126'));

//$123,456,789.13


function formatMoney(strNumber)
{ 
    if(!isNumber(strNumber)) return strNumber;
    
    var nNumber=(Number(strNumber)).toFixed(2);
    strNumber=nNumber.toString();
    var decimalPart="";
    var intPart="";
    if(strNumber.indexOf(".")==-1)//no .
    {
         decimalPart="";
         intPart=strNumber;
    }
    else//yes .
    {   
        decimalPart=strNumber.substring(strNumber.indexOf("."));
        intPart=strNumber.substring(0,strNumber.indexOf("."));
    }

    intPart=intPart.replace(/^(\d*)$/,"$1\,");
    var re=/(\d)(\d{3}\,)/;
    while(re.test(intPart))
    {
        intPart=intPart.replace(re,"$1\,$2");
    }
    intPart=intPart.substring(0,intPart.length-1);
    return "$"+intPart+decimalPart;
}
function isNumber(str)
{
    var patt=/^\d+(\.\d+)?$/;
    return patt.test(str);
}

 

 

 

/********************
 * 取窗口滚动条高度 
 ******************/
function getScrollTop()
{
    var scrollTop=0;
    if(document.documentElement&&document.documentElement.scrollTop)
    {
        scrollTop=document.documentElement.scrollTop;
    }
    else if(document.body)
    {
        scrollTop=document.body.scrollTop;
    }
    return scrollTop;
}


/********************
 * 取窗口可视范围的高度 
 *******************/
function getClientHeight()
{
    var clientHeight=0;
    if(document.body.clientHeight&&document.documentElement.clientHeight)
    {
        var clientHeight = (document.body.clientHeight<document.documentElement.clientHeight)?document.body.clientHeight:document.documentElement.clientHeight;        
    }
    else
    {
        var clientHeight = (document.body.clientHeight>document.documentElement.clientHeight)?document.body.clientHeight:document.documentElement.clientHeight;    
    }
    return clientHeight;
}

/********************
 * 取文档内容实际高度 
 *******************/
function getScrollHeight()
{
    return Math.max(document.body.scrollHeight,document.documentElement.scrollHeight);
}

 

//getElementById

function $(id)
{
    return document.getElementById(id);
}

//new guid

function newGuid()
{
    var guid = "";
    for (var i = 1; i <= 32; i++){
      var n = Math.floor(Math.random()*16.0).toString(16);
      guid +=   n;
      if((i==8)||(i==12)||(i==16)||(i==20))
        guid += "-";
    }
    return guid;    
}

  

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