关于弹出层的拖拽，封装 

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        html{
            height: 100%;
        }
        body{
            width: 100%;
            height: 100%;
            position: relative;
        }
        #test{
            width: 100px;
            height: 100px;
            background: #000;
            position: absolute;
            /*transform: translate(-50%,-50%);*/
        }
        #p{
            width: 100%;
            height: 20px;
            background: red;
        }
        .close{
            display: inline-block;
            width: 20px;
            height: 100%;
            background:#ddd;
            cursor: pointer;
        }
    </style>
</head>
<body>
    <div id="test">
        <p id="p">
            <span class="close">X</span>
        </p>
    </div>
</body>
<script>
    var oDrag = document.getElementById("test");
    var oTitle = document.getElementById("p");
    var closeEle = document.getElementsByClassName("close")[0];
    oDrag.style.left=(document.body.offsetWidth-oDrag.offsetWidth)/2+"px";
    oDrag.style.top=(document.body.offsetHeight-oDrag.offsetHeight)/2+"px";
    window.onresize=function () {
        oDrag.style.left=(document.body.offsetWidth-oDrag.offsetWidth)/2+"px";
        oDrag.style.top=(document.body.offsetHeight-oDrag.offsetHeight)/2+"px";
        drag(oTitle, oDrag,closeEle);
    };
    window.onload=function () {
        drag(oTitle, oDrag,closeEle);
    };
    function drag(oTitle,oDrag,closeEle) {
        closeEle.onclick=function () {
                oDrag.style.display='none';
                this.onclick=null;
        };
        oTitle.onmousedown=function(event){
            oTitle.style.cursor = "move";
            var event = event || window.event;
            var disX=event.clientX-oDrag.offsetLeft;//鼠标在屏幕中的坐标减去元素距离屏幕的左边距，等于这个鼠标在div元素中距离div最左边的的左偏移量
            var disY=event.clientY-oDrag.offsetTop;
            console.log(disX,disY)
//鼠标移动，窗口随之移动     onmousemove在有物体移动是才执行alert事件；
            document.onmousemove=function(event){
                var event = event || window.event;
                maxW=document.documentElement.clientWidth-oDrag.offsetWidth;//div元素在屏幕中的最大left。
                maxH=document.documentElement.clientHeight-oDrag.offsetHeight;
                posX=event.clientX-disX;//鼠标坐标减去鼠标在div元素中的偏移坐标，相当于div元素距离屏幕的最左的距离。也就是left
                posY=event.clientY-disY;//鼠标坐标减去鼠标在div元素中的偏移坐标，相当于div元素距离屏幕的最顶部的距离。也就是top
                if(posX<0){
                    posX=0;
                }else if(posX>maxW){
                    posX=maxW;
                }
                if(posY<0){
                    posY=0;
                }else if(posY>maxH){
                    posY=maxH;
                }
                oDrag.style.left=posX+'px';
                oDrag.style.top=posY+'px';
            };
//鼠标松开，窗口将不再移动
            document.onmouseup=function(){
                document.onmousemove=null;
                document.onmouseup=null;
            }
        }
    }
</script>
</html>

 

posted @ 2016-09-19 23:37  不正经的CodeMonkey  阅读(273)  评论(0)    收藏  举报