jquery拖拽

拖拽一定要去除默认行为！！

var _Mover=function(dom,parent) {
var _s = $(dom), cc = false, l, t , S = $(parent) || _s;
_s.css("cursor", "move");
_s.mousedown(function (e) {
    var e = e || event, ele = e.target || e.srcElement;
    if (ele.nodeName.toLocaleLowerCase() == "a") return;
        l = e.pageX - S.offset().left;
        t = e.pageY - S.offset().top;
                    
        $(document).mousemove(function (e) {
                        
            $(this).css("cursor", "move");
            var e = e || event,
                x = e.pageX,
                y = e.pageY,
                L = x - l,
                T = y - t;
            if (L < 0) L = 0;
            else if (L > $(window).width() - S.outerWidth()) L = $(window).width() - S.outerWidth();
            if (T < $(window).scrollTop()) T = $(window).scrollTop();
            else if (T > ($(window).scrollTop() + $(window).height() - S.outerHeight())) T = $(window).scrollTop() + $(window).height() - S.outerHeight();
            S.css({ "left": L, "top": T, "margin": 0 });
                        
        });

        $(document).mouseup(function () {
            $(this).css("cursor", "default");
            $(document).unbind("mousemove");
            $(document).unbind("mouseup");
        });
        stop(e);
})


function stop(e) {
    var e = e || event;
    //if (e.stopPropagation) e.stopPropagation();
    //else e.cancelBubble = true;
    if (e.preventDefault) e.preventDefault();
    else e.returnValue = false;
}