javascript 实现原路返回

2019-11-20 13:20:46

字体：大中小

来源：转载

供稿：网友

css代码

<style type="text/css">
        * {
            margin: 0px;
            padding: 0px;
            font-family: "micsoft yahei","微软雅黑";
            font-size: 15px;
        }
        div{
            width: 50px;
            height: 50px;
            background: #f00;
            border-radius:5px ;
            -moz-border-radius: 5px;
            -webkit-border-radius: 5px;
            cursor: pointer;
            position:  absolute;
            top: 60px;
            left: 30px;
        }
        input{
            position: absolute;
            top: 10px;
            left: 10px;
            padding: 3px;
            cursor: pointer;
        }
    </style>

html代码

复制代码代码如下:

 <body>
 <input type="button" value="原路返回"/>
 <div></div>
 </body>

javascript代码

复制代码代码如下:

<script type="text/javascript">
          //1、以鼠标在div上点击触发为开始
          //2、点击鼠标移动时触发鼠标移动事件 向数组内注入数据（移动的坐标）
          //3、以鼠标从div上移开为结束
          //4、点击“原路返回”按钮遍历数组（移动的坐标） 定时触发数组内的坐标移动div 达到”返回“的功能
            window.onload=function(){
                var oDiv=document.getElementsByTagName("div")[0];
                var oBtn=document.getElementsByTagName("input")[0];
                var time=null,arrTop=[],arrLeft=[];
                oDiv.onmousedown=function(ev){
                    var event=ev || window.event;
                    //获取鼠标在div内的坐标
                    var disX=event.clientX-oDiv.offsetLeft;
                    var disY=event.clientY-oDiv.offsetTop;
                    arrTop=[60];
                    arrLeft=[30];
                    document.onmousemove=function(ev){
                        var event=ev || window.event;
                        //获取拖拽后鼠标的位置
                        var l=event.clientX;
                        var t=event.clientY;
                        //把拖拽后的位置存进数组里面，用拖拽后鼠标的位置减去鼠标在物体上的位置，就是拖拽后物体的位置
                        arrLeft.push(l-disX);
                        arrTop.push(t-disY);
                        oDiv.style.left=l-disX +"px";
                        oDiv.style.top=t-disY +"px";
                    };
                    document.onmouseup=function(){
                        document.onmousemove=null;
                        document.onmouseup=null;
                    };
                    return false;
                }
                //原路返回的核心就是把移动时的坐标记录下来，然后进行数组重排，并设定定时器把数组内的搞宽赋值给物体。
                oBtn.onclick=function(){
                    arrTop.reverse();//重排
                    arrLeft.reverse();//重排
                    var i=0;
                    oBtn.time=setInterval(function(){
                        oDiv.style.top=arrTop[i]+"px";
                        oDiv.style.left=arrLeft[i]+"px";
                        i++;
                        if(i==arrTop.length){
                            clearInterval(oBtn.time);
                            arrTop=[];
                            arrLeft=[];
                        }
                    },20);
                }
            }
    </script>