popup.html

<script type='text/javascript'>
var e=encodeURIComponent;
chrome.tabs.getSelected(null, function(tab) {
    chrome.tabs.sendRequest(tab.id, {action: "getSelected"}, function(response) {
        var r='http://www.douban.com/recommend/?url='+e(tab.url)+'&title='+e(tab.title)+'&sel='+e(response.data)+'&v=1';
        console.log(r);
        var xhr = new XMLHttpRequest();
        xhr.open("GET",r,true);
        xhr.onreadystatechange = function() {
            if (xhr.readyState==4)
            {
                if (xhr.status==200)
                {
                    document.write(xhr.responseText);
                    if (response.data)
                    {
                        var ta=document.getElementById('status_textarea');
                        ta.value = " //"+response.data;
                    }
                    document.body.style.width="500px";
                    document.body.style.height="300px";
                }
                else
                {
                    document.write("error: "+xhr.status);
                }
            }
        };
        xhr.send();
    });
});
</script>