原生弹窗拖拽代码demo+简单的抽奖

拖拽效果

效果:

代码:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>弹窗拖拽</title>
    <style>
        *{margin:0;padding:0;}
        .box{position: absolute;width: 400px;height: 300px;top:100px;left:100px;border:1px solid #001c67;background: #}
        .move{position: absolute;width: 100px;height: 100px;top:100px;left:150px;border:1px solid #000;}
        .move:hover{cursor: move;}
        .close{position: absolute;width: 30px;height: 30px;top:0px;right:0px;background:red;text-align: center;line-height: 30px;}
    </style>
    <script>
        window.onload=function(){
            var oMove=document.getElementById('move');
           // 拖曳
           oMove.onmousedown=fnDown;
           // 关闭
           var oClose=document.getElementById('close');
           oClose.onclick=function(){
              document.getElementById('box').style.display='none';
           }
        }
        function fnDown(event){
            event = event || window.event;
            var oDrag=document.getElementById('box'),
                // 光标按下时光标和面板之间的距离
                disX=event.clientX-oDrag.offsetLeft,
                disY=event.clientY-oDrag.offsetTop;
            // 移动
            document.onmousemove=function(event){
                event = event || window.event;
                var l=event.clientX-disX,
                    t=event.clientY-disY,
                    // 最大left,top值
                    leftMax=(document.documentElement.clientWidth || document.body.clientWidth)-oDrag.offsetWidth,
                    topMax=(document.documentElement.clientHeight || document.body.clientHeight)-oDrag.offsetHeight;
                if(l<0)  l=0;
                if(l>leftMax) l=leftMax;
                if(t<0)  t=0;
                if(t>topMax) t=topMax;
                oDrag.style.left=l+'px';
                oDrag.style.top=t+'px';
            }
            // 释放鼠标
            document.onmouseup=function(){
                document.onmousemove=null;
                document.onmouseup=null;
            }
        }
    </script>
</head>
<body>
    <div class="box" id="box">
        <div class="move" id="move">拖拽区域</div>
        <div class="close" id="close">X</div>
    </div>
</body>
</html>

 主要注意几点:

1.event,IE兼容问题

2.点击鼠标时要先判断鼠标与面板之间的距离

3.要判断弹窗与浏览器整个区域的距离,不能让弹窗跑出浏览器外的区域

4.松开鼠标要解除事件绑定,不然会有bug

 简单的抽奖(可用键盘)

效果:

代码:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>简单抽奖(可用键盘)</title>
    <style>
        *{margin:0;padding:0;}
        .box{width: 400px;height: 300px;margin:50px auto;background: red}
        .title{color: #fff;font-size: 30px;font-weight:700px;padding: 50px 0;text-align: center;height:40px;}
        .btm{text-align: center;padding:20px 0;}
        .btm a{display: inline-block;width: 120px;height:60px;line-height: 60px;background: #FEF097;margin:0 10px;text-decoration: none;}
    </style>
    <script>
        var data=['Iphone','Ipad','笔记本','相机','谢谢参与','充值卡','购物券'],
            timer=null,//定时器
            flag=0;//阻止多次回车
        window.onload=function(){
            var play=document.getElementById('play'),
                stop=document.getElementById('stop');
            // 开始抽奖
            play.onclick=playFun;
            stop.onclick=stopFun;
            // 键盘事件
            document.onkeyup=function(event){
                event = event || window.event;
                // 回车键的code值:13
                if(event.keyCode==13){
                    if(flag==0){
                        playFun();
                        flag=1;
                     }else{
                           stopFun();
                           flag=0;
                     }
                  }
               }
               function playFun(){
                var title=document.getElementById('title');
                var play=document.getElementById('play');
                clearInterval(timer);
                timer=setInterval(function(){
                   var random=Math.floor(Math.random()*data.length);
                   title.innerHTML=data[random];
                },60);
                play.style.background='#999';
            }
            function stopFun(){
                clearInterval(timer);
                var play=document.getElementById('play');
                play.style.background='#FEF097';
            }
        }
    </script>
</head>
<body>
    <div class="box">
        <div class="title" id="title">淘家趣抽奖</div>
        <div class="btm">
            <a href="javascript:;" id="play">开始</a>
            <a href="javascript:;" id="stop">停止</a>
        </div>
    </div>
</body>
</html>

 

 注意点:

1.随机数,取数组的其中一个;取0-n之间:Math.random()*(n+1)

2.定时器,开始抽奖时要停止前面的一次抽奖,不然会定时器重叠

3.按键操作,要判断是抽奖进行中,还是未开始,所有设置了变量 flag

 

posted @ 2016-06-22 22:00  羯瑞  阅读(643)  评论(0编辑  收藏  举报