javascript中字符串与ascii转换的例子

//字符串转化为ascii
function str2asc($str)
{
    $num='';
    while(strlen($str)!=0)
    {
        $a=substr($str,0,1);
        $num.=ord($a);
        $str=substr($str,1,strlen($str));
    }
    return $num;
}

//ascii转化为字符串
function asc2str($num)
{
    $num=(string)$num;
    $str='';
    while(strlen($num)!=0)
    {
        $a=(int)substr($num,0,1);
        if($a>2)
        {
            $b=(int)substr($num,0,2);
            $num=substr($num,2,strlen($num));
        }else
        {
            $b=(int)substr($num,0,3);
            $num=substr($num,3,strlen($num));
        }
        $str.=chr($b);
    }
    return $str;
}

echo str2asc( 'sfdsl ');
echo  ' <br > ';
echo asc2str(str2asc( 'sfdsl '));
---------------------
115102100115108
sfdsl