letv.user.js

// ==UserScript==
// @name 乐视网
// @match http://www.letv.com/ptv/vplay/*
// ==/UserScript==

(function(vid){
    var list=["720p","350"];
    var box=document.querySelector("#fla_box");
    var embed=box.querySelector("embed");
    box.removeChild(embed);
    GM_xmlhttpRequest({
        method:"GET",
        url:"http://www.letv.com/v_xml/"+vid+".xml",
        onload:function(res){
            var doc=new DOMParser().parseFromString(res.responseText,"text/xml");
            var url=doc.getElementsByTagName("playurl")[0];
            var json=JSON.parse(url.textContent);
            list.some(function(type){
                if(json.dispatch[type]){
                    var vlc=document.createElement("embed");
                    vlc.src=json.dispatch[type][0];
                    vlc.type="video/flv";
                    vlc.style.width="100%";
                    vlc.style.height="100%";
                    box.appendChild(vlc);
                    return true;
                }
            });
        }
    });
})(unsafeWindow.__INFO__.video.vid);