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From: "Chen Liqiang" <chen...@gmail.com>Date: Sat, 24 Feb 2007 07:24:26 -0000
Local: Sat, Feb 24 2007 2:24 am
Subject: 常用JS函数
/**
* 去除空格
*/
String.prototype.trim = function()
{
return this.replace(/(^[\s| ]*)|([\s| ]*$)/g, "");
}
/**
* 去除左空格
*/
String.prototype.ltrim = function()
{
return this.replace(/(^[\s| ]*)/g, "");
}
/**
* 去除右空格
*/
String.prototype.ltrim = function()
{
return this.replace(/([\s| ]*$)/g, "");
}
/**
* vbscript 的left函数，取字符串最左边len个字符
*/
function left(str,len) {
return str.substr(0,len);
}
/**
* vbscript 的right函数，取字符串最右边len个字符
*/
function right(str,len) {
if (str.length-len>=0 && str.length>=0 && str.length-len<=str.length)
{
return str.substring(str.length-len,str.length)
} else {
return null
};
}
/**
* 简化getElementById
*/
function $(s)
{
return document.getElementById(s);
}
/**
* 创建新html元件
*/
function $c(s)
{
return document.createElement(s);
}
/**
* 判断html元件是否存在
*/
function exist(s)
{
return $(s)!=null;
}
/**
* 输出html内容
*/
function dw(s)
{
document.write(s);
}
/**
* 判断一个变量是否为空
*/
function isNull(_sVal)
{
return (_sVal == "" || _sVal == null || _sVal == "undefined");
}
/**
* 删除节点
*/
function removeNode(s)
{
if(exist(s))
{
$(s).innerHTML = '';
$(s).removeNode?$(s).removeNode():$(s).parentNode.removeChild($(s));
}
}
/**
* 刷新页面
*/
function refreshPage() {
window.location.reload();
}
/**
* 字符串长度
*/
function strlen(key){
var l=escape(key),len;
len=l.length-(l.length-l.replace(/\%u/g,"u").length)*4;
l=l.replace(/\%u/g,"uu");
len=len-(l.length-l.replace(/\%/g,"").length)*2;
return len;
}
/**
* 取URL参数
*/
function GetUrlParam( paramName )
{
var oRegex = new RegExp( '[\?&]' + paramName + '=([^&]+)', 'i' ) ;
var oMatch;
try {
oMatch = oRegex.exec( window.top.location.search ) ;
} catch (e) {
oMatch = oRegex.exec( location.search ) ;
}
if ( oMatch && oMatch.length > 1 )
return unescape( oMatch[1] ) ;
else
return '' ;
}
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