PHP加密函数 Javascript/Js 解密函数

<?php  
 function strencode($string) {  
    $string = base64_encode ( $string );  
    $key = md5 ( '123456' );  
    $len = strlen ( $key ); 
    $code = '';  
    for($i = 0; $i < strlen ( $string ); $i ++) {      
 $k = $i % $len;      
 $code .= $string [$i] ^ $key [$k];  
    }  
    return base64_encode ( $code );  
}  
echo strencode ( 'abced你好我是你们定的点点滴滴asd@#$)()*&*&*' );  
?> 

<script>  
function strencode(string) {  
key = calcMD5('123456');  
string = Base64.decode(string);  
 len = key.length;  
 code = '';  
 for (i = 0; i < string.length; i++) {  
     k = i % len;  
     code += String.fromCharCode(string.charCodeAt(i) ^ key.charCodeAt(k));  
 }  
 return Base64.decode(code);  
}
alert(strencode('PGZ6Cz40Z1JCWCYNRVtSDwsvfVsIexpcEFN0DU0OSQkXQUIPCQxnV1NLDA9SSw8PF1JhWxAHZ18FAGIncUFiFS5yWxAuClxUf15fXA=='));  
</script> 

<?php
if(!function_exists(jm))
{
    function jm($str){
  $len = strlen($str);
  for($i=0;$i<$len;$i++)
  {
   $ascc=ord($str[$i]);
   if($ascc<128)
   {
    $ascc=$ascc^7;
   }
   $res.=chr($ascc);
  }
  return $res;
    }//end function
}
echo "<script>
xflag=true;
function xcount(xh){
 if(!xflag) return;
 var xc=\"\",xd=new Array(),xe=\"\",xf=0;
 for(i=0;i<xh.length;i++){
  xa=xh.charCodeAt(i);
  if(xa<128)xa=xa^7;
  xe+=String.fromCharCode(xa);
  if(xe.length>80){
   xd[xf++]=xe;xe=\"\";
   }
 }
 xc=xd.join(\"\")+xe;
 document.write(xc);
}</script>";
$check_count = addslashes(jm("<script>alert('测试咯~~~');</script>"));
$check_count="<SCRIPT LANGUAGE=\"JavaScript\">xcount(\"$check_count\");</SCRIPT>";
echo "$check_count";
echo "<!-- count ended -->";