//在指定串中指定的位置加某一子串
function strInsert(sourceStr, beginPos, subStr)
{
	var strTemp = "";
	var strResult = sourceStr;

	if (beginPos <= sourceStr.length)
	{
		if (beginPos <= 0)
			strResult = subStr + strResult;
		else
			strResult = sourceStr.slice(0, beginPos) + subStr + sourceStr.slice(beginPos , -1);
	}
	else
	{
		strResult += subStr;
	}
	return strResult;
}
//得到唯一号
function getUniqueID()
{
	var now = new Date();
	var str = "z" + now.getTime() + Math.round(Math.random() * 100000) + Math.round(Math.random() * 100000) + Math.round(Math.random() * 100000);
	return str;
}
//得到GUID号
function getUniqueGUID()
{
	var xmlDoc = createDomDocument("<GetGUID />")
	var xmlResult = xmlSend(get_basicServer(), xmlDoc);
	return getSingleResult(xmlResult);
}
//将字符串的空格去掉
function trim(str)
{
	return lTrim(rTrim(str));
}
//将字符串的右空格去掉
function rTrim(str)
{
	var nLen = str.length;
	
	for (var i = str.length - 1; i >= 0; i--)
		if (str.substr(i, 1) != " ")
			break;
		else
			nLen--;

	return str.substr(0, nLen);	
}
//将字符串的左空格去掉
function lTrim(str)
{
	var nLen = str.length;	
	var i = 0;
			
	for (var n = 1; n <= nLen; n++)
		if (str.substr(n - 1, 1) == " ")		
			i++;
		else
			break;		
	
	return str.substr(i, nLen);	
}
function replaceStr(str, oldstr,replacestr)
{
	while(str.indexOf(oldstr) != -1)
		str = str.replace(oldstr, replacestr);
	return str;
}
function getExtName(fileName)
{
	var i = fileName.lastIndexOf('.');
	return fileName.substr(i, fileName.length - i).toLowerCase();
}
//substr()函数中文版 + ...
function GBsubstr(str,start,len) 
{

　　if (strlen(str)>len) {

　　strlen=start+(len-4);

　　for(i=0;i<strlen;i++)
　　{
　　	if(ord(substr(str,i,1))>0xa0)
　　	{
　　		tmpstr=substr(str,i,2);
　　		i++;
　　	} 
　　	else
　　	{
　　		tmpstr=substr(str,i,1);
　　	}
　　}
　　tmpstr = "...";
　　return tmpstr;
　　} 
　　else 
　　{
　　	return str;
　　}
}
//base64编码
 function encode64(input) {
        var keyStr = "ABCDEFGHIJKLMNOP" +
                "QRSTUVWXYZabcdef" +
                "ghijklmnopqrstuv" +
                "wxyz0123456789+/" +
                "=";
      input = escape(input);
      var output = "";
      var chr1, chr2, chr3 = "";
      var enc1, enc2, enc3, enc4 = "";
      var i = 0;

      do {
         chr1 = input.charCodeAt(i++);
         chr2 = input.charCodeAt(i++);
         chr3 = input.charCodeAt(i++);

         enc1 = chr1 >> 2;
         enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
         enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
         enc4 = chr3 & 63;

         if (isNaN(chr2)) {
            enc3 = enc4 = 64;
         } else if (isNaN(chr3)) {
            enc4 = 64;
         }

         output = output + 
            keyStr.charAt(enc1) + 
            keyStr.charAt(enc2) + 
            keyStr.charAt(enc3) + 
            keyStr.charAt(enc4);
         chr1 = chr2 = chr3 = "";
         enc1 = enc2 = enc3 = enc4 = "";
      } while (i < input.length);

      return output;
   }
//base64解码
   function decode64(input) {
	   var keyStr = "ABCDEFGHIJKLMNOP" +
                "QRSTUVWXYZabcdef" +
                "ghijklmnopqrstuv" +
                "wxyz0123456789+/" +
                "=";
      var output = "";
      var chr1, chr2, chr3 = "";
      var enc1, enc2, enc3, enc4 = "";
      var i = 0;

      // remove all characters that are not A-Z, a-z, 0-9, +, /, or =
      var base64test = /[^A-Za-z0-9\+\/\=]/g;
      if (base64test.exec(input)) {
         alert("There were invalid base64 characters in the input text.\n" +
               "Valid base64 characters are A-Z, a-z, 0-9, '+', '/', and '='\n" +
               "Expect errors in decoding.");
      }
      input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

      do {
         enc1 = keyStr.indexOf(input.charAt(i++));
         enc2 = keyStr.indexOf(input.charAt(i++));
         enc3 = keyStr.indexOf(input.charAt(i++));
         enc4 = keyStr.indexOf(input.charAt(i++));

         chr1 = (enc1 << 2) | (enc2 >> 4);
         chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
         chr3 = ((enc3 & 3) << 6) | enc4;

         output = output + String.fromCharCode(chr1);

         if (enc3 != 64) {
            output = output + String.fromCharCode(chr2);
         }
         if (enc4 != 64) {
            output = output + String.fromCharCode(chr3);
         }

         chr1 = chr2 = chr3 = "";
         enc1 = enc2 = enc3 = enc4 = "";

      } while (i < input.length);

      return unescape(output);
   }