关于Latin1编码在JS和php端不一致问题

var sha1=cryptojs.sha1("abc");document.write("sha1:",sha1);document.write("<br>");var sha1_latin=sha1.tostring(cryptojs.enc.latin1);document.write("sha1_latin:",sha1_latin);document.write("latin.len:",sha1_latin.length);document.write("<br>");var sha1_hex=strtohex(sha1_latin);//此处为自己定义的一个函数，将字符串转换为ascii的16进制形式document.write("hex:",sha1_hex);document.write("<br>");var xmlhttp1;if (window.xmlhttprequest)  {  xmlhttp1=new xmlhttprequest();  }else  {  xmlhttp1=new activexobject("microsoft.xmlhttp");  }	xmlhttp1.open("get","web/tes.php?sha1_html="+sha1_latin,false);//发送给php    xmlhttp1.send();    document.write(xmlhttp1.responsetext);

<?php  $username_php=$_get['sha1_html'];	echo $username_php;	echo '<br/>';	echo strlen($username_php);	echo '<br/>';	echo bin2hex($username_php);	echo '<br/>';?>  

$gbk = '中文';$utf8 = iconv('gbk', 'utf-8', $gbk);if(isset($_GET['ch'])) {  echo "utf8 = '$utf8'; document.write(gbk == utf8);";}else {  echo "<script>gbk = '$gbk';</script>";  echo "<script src=?ch=1 charset=utf-8></script>";}

<?php  $sh=$_GET['sha1'];$sh1=sha1("abc",true);$SS=iconv("UTF-8","ISO-8859-1",$sh);	echo $SS;	echo '<br/>';	echo strlen($SS);	echo '<br/>';	echo bin2hex($SS);	echo '<br/>';?>  

<?php  $sh=$_GET['sha1'];$a="abc";$sh1=sha1("abc",true);$SS=iconv("UTF-8","ISO-8859-1",$sh);if($SS==$sh1)	echo "true";	echo $SS;?>