<script>
function unicode(s){
var len=s.length;
var rs="";
for(var i=0;i<len;i++){
var k=s.substring(i,i+1);
rs+="&#"+s.charCodeAt(i)+";";
}
return rs;
}

function runicode(s){
var k=s.split(";");
var rs="";
for(i=0;i<k.length;i++){
var m=k.replace(/&#/,"");
rs+=String.fromCharCode(m);
}
return rs;
}
alert(unicode("我是一头猪"));//我是一头猪
alert(runicode("我是一头猪"));
</script>