SOURCE

var nodes = document.querySelectorAll(".ele");

    // var container = document.querySelector(".container");
    // console.log(nodes);
    var draging = null,
        target = null;
    clone = null;
    for (var i in nodes) {
        nodes[i].ondragstart = function(event) {
            console.log("start");
            event.dataTransfer.setData("te", event.target.innerText); //不能使用text，firefox会打开新tab
            //event.dataTransfer.setData("self", event.target);

            draging = event.target;

        }

        nodes[i].ondrop = function(event) {

            console.log("onDrop");
            var text = event.dataTransfer.getData("te");
            event.preventDefault();
        }
        // document.ondrop = function(event) {
        //     alert("document");
        //     event.preventDefault();

        // }
        // document.documentElement.ondrop = function(event) {
        //     alert("documentElement");
        //     event.preventDefault();

        // }
        nodes[i].ondragover = function(event) {
            console.log("onDrop over");
            event.preventDefault();
            event.stopPropagation();
            target = event.target;
            if (target !== draging) {
                var targetRect = target.getBoundingClientRect();
                var dragingRect = draging.getBoundingClientRect();
                if (target) {
                    if (target.animated) {
                        return;
                    }
                }
                if (_index(draging) < _index(target)) {
                    target.parentNode.insertBefore(draging, target.nextSibling);
                } else {
                    target.parentNode.insertBefore(draging, target);
                }
                _animate(dragingRect, draging);
                _animate(targetRect, target);
            }
        }

        // event.stopPropagation();


        nodes[i].ondragenter = function(event) {
            console.log("onDrop enter");
            //this.style.background = "blue";
            event.preventDefault();
        }

        nodes[i].ondragleave = function(event) {
            console.log("onDrop leave");
            //this.style.background = "red";

            event.preventDefault();
        }

        nodes[i].ondragend = function(event) {
            console.log("onDrop end");


            event.preventDefault();
        }

    }

    function _index(el) {
        var index = 0;

        if (!el || !el.parentNode) {
            return -1;
        }

        while (el && (el = el.previousElementSibling)) {
            //console.log(el);
            index++;
        }

        return index;
    }

    function _animate(prevRect, target) {
        var ms = 300;

        if (ms) {
            var currentRect = target.getBoundingClientRect();

            if (prevRect.nodeType === 1) {
                prevRect = prevRect.getBoundingClientRect();
            }

            _css(target, 'transition', 'none');
            _css(target, 'transform', 'translate3d(' +
                (prevRect.left - currentRect.left) + 'px,' +
                (prevRect.top - currentRect.top) + 'px,0)'
            );

            target.offsetWidth; // repaint

            _css(target, 'transition', 'all ' + ms + 'ms');
            _css(target, 'transform', 'translate3d(0,0,0)');

            clearTimeout(target.animated);
            target.animated = setTimeout(function() {
                _css(target, 'transition', '');
                _css(target, 'transform', '');
                target.animated = false;
            }, ms);
        }
    }

    function _css(el, prop, val) {
        var style = el && el.style;

        if (style) {
            if (val === void 0) {
                if (document.defaultView && document.defaultView.getComputedStyle) {
                    val = document.defaultView.getComputedStyle(el, '');
                } else if (el.currentStyle) {
                    val = el.currentStyle;
                }

                return prop === void 0 ? val : val[prop];
            } else {
                if (!(prop in style)) {
                    prop = '-webkit-' + prop;
                }

                style[prop] = val + (typeof val === 'string' ? '' : 'px');
            }
        }
    }

<ul>
        <li class="ele" draggable="true">1</li>
        <li class="ele" draggable="true">2</li>
        <li class="ele" draggable="true">3</li>
        <li class="ele" draggable="true">4</li>
    </ul>

ul {
        list-style: none;
        margin: 200px;
    }

    .ele {
        width: 100%;
        height: 40px;
        border: 1px solid #999;
        background: #EA6E59;
        margin-top: 2px;
        border-radius: 10px;
        padding-left: 10px;
        color: white;
        cursor: move;
    }