问如何通过jQuery插件拖放链接/页面？

EN

var LinkGrabber = {
    textarea: null,

    /* Textarea Management */

    attach_ta: function(){
        if(LinkGrabber.textarea != null) return;

        var textarea = LinkGrabber.textarea = document.createElement("textarea");
        textarea.setAttribute("style", "position: fixed; width: 100%; margin: 0; top: 0; bottom: 0; right: 0; left: 0; z-index: 99999999");
        textarea.style.opacity = "0.000000000000000001";

        var body = document.getElementsByTagName("body")[0];
        body.appendChild(textarea);

        textarea.oninput = LinkGrabber.evt_got_link;
    },

    detach_ta: function(){
        if(LinkGrabber.textarea == null) return;
        var textarea = LinkGrabber.textarea;

        textarea.parentNode.removeChild(textarea);
        LinkGrabber.textarea = null;
    },

    /* Event Handlers */

    evt_drag_over: function(){
        LinkGrabber.attach_ta(); //Create TA overlay
    },

    evt_got_link: function(){
        /* THIS IS WHERE WE HANDLE THE RECEIVED LINK */

        var link = LinkGrabber.textarea.value;

        alert(link);

        LinkGrabber.detach_ta();
    },

    evt_drag_out: function(e){
        if(e.target == LinkGrabber.textarea) LinkGrabber.detach_ta();
    },

    /* Start/Stop */

    start: function(){
        document.addEventListener("dragover", LinkGrabber.evt_drag_over, false);
        document.addEventListener("dragenter", LinkGrabber.evt_drag_over, false);

        document.addEventListener("mouseup", LinkGrabber.evt_drag_out, false);
        document.addEventListener("dragleave", LinkGrabber.evt_drag_out, false);
    },

    stop: function(){
        document.removeEventListener("dragover", LinkGrabber.evt_drag_over);
        document.removeEventListener("dragenter", LinkGrabber.evt_drag_over);

        document.removeEventListener("mouseup", LinkGrabber.evt_drag_out);
        document.removeEventListener("dragleave", LinkGrabber.evt_drag_out);

        LinkGrabber.detach_ta();
    }
};