使用js实现的简单拖拽效果

前端开发的时候，有好多地方用到拖拽效果,当然 http://jqueryui.com/draggable/  是个不错的选择,but 我是个打破砂锅问到底的人，抽点时间用js小小的实现了类似的插件，话不多说。

　first:　html和css

复制代码 代码如下:

   
   
   
        * {
            margin: 0;
            padding: 0;
        }
        #div1 {
            position: absolute;
            width: 100px;
            height: 100px;
            cursor: move;
            background-color: red;
        }
   


   
   

now,先把主要算法实现一下：

复制代码 代码如下:
 

yeah,使用面向对象实现一下

复制代码 代码如下:

        * {
            margin:0;
            padding:0;
        }
        #div1 {
            width: 100px;
            height: 100px;
            background-color: red;
        }
        #div2 {
            background-color:yellow;
            width:100px;
            height:100px;
        }
   

js Draggle class:

复制代码 代码如下:
 function Drag(id) {
            this.div = document.getElementById(id);
            if (this.div) {
                this.div.style.cursor = "move";
                this.div.style.position = "absolute";
            }
            this.disX = 0;
            this.disY = 0;
            var _this = this;
            this.div.onmousedown = function (evt) {
                _this.getDistance(evt);
                document.onmousemove = function (evt) {
                    _this.setPosition(evt);
                }
                _this.div.onmouseup = function () {
                    _this.clearEvent();
                }
            }
        }
        Drag.prototype.getDistance = function (evt) {
            var oEvent = evt || event;
            this.disX = oEvent.clientX - this.div.offsetLeft;
            this.disY = oEvent.clientY - this.div.offsetTop;
        }
        Drag.prototype.setPosition = function (evt) {
            var oEvent = evt || event;
            var l = oEvent.clientX - this.disX;
            var t = oEvent.clientY - this.disY;
            if (l <= 0) {
                l = 0;
            }
            else if (l >= document.documentElement.clientWidth - this.div.offsetWidth) {
                l = document.documentElement.clientWidth - this.div.offsetWidth;
            }
            if (t <= 0) {
                t = 0;
            }
            else if (t >= document.documentElement.clientHeight - this.div.offsetHeight) {
                t = document.documentElement.clientHeight - this.div.offsetHeight;
            }
            this.div.style.left = l + "px";
            this.div.style.top = t + "px";
        }
        Drag.prototype.clearEvent = function () {
            this.div.onmouseup = null;
            document.onmousemove = null;
        }

at last：最终实现：

复制代码 代码如下:
  window.onload = function () {
            new Drag("div1");
            new Drag("div2");
        }

效果如下:

以上所述就是本文的全部内容了，希望能对大家更加熟练的掌握javascript有所帮助。