关于字符串的几个有用函数

1、测试字符串长度（中英文）

function strLen(s)
{
 var i,str1,str2,str3,nLen;
 str1 = s.value;
 nLen = 0;
 for(i=1;i<=str1.length;i++)
 {
  str2=str1.substring(i-1,i)
  str3=escape(str2);
  if(str3.length>3)
   {
    nLen = nLen + 2;
   }
  else
   {
    nLen = nLen + 1;
   }
 }
 return nLen;
}
2、替换

function Replace(s1,s2,s3)
{
 var len1 , len2 , i;
 var str1 , str2 ;
 str1 = s1;
 len1 = str1.length;
 len2 = s2.length;
 if (len2 > len1)
  return s1;
 for (i=1;i<= len1-len2+1 ; i++)
     {
   
   str2 = str1.substring(i-1,i-1+len2);
   if (str2 == s2)
    {
     str1 = str1.substring(0,i-1) + s3 + str1.substring(i+len2-1,len1 );
     i = 0;
     len1 = str1.length;
    }
     }
 return str1;
}

3、查找
function Pos(s1,s2)
{
 var len1 , len2 , i,flag;
 var str1 , str2 ;
 str1 = s1;
 len1 = str1.length;
 len2 = s2.length;
 if (len2==0 || len1==0)
     return 0;
 flag = false;
 if (len2 > len1)
  return s1;
 for (i=1;i<= len1-len2+1 ; i++)
     {
   
   str2 = str1.substring(i-1,i-1+len2);
   if (str2 == s2)
    {
     flag = true;
     break;
    }
     }
 if (flag)
  return i;
 else
  return 0;
}

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