js实现网页大转盘抽奖程序

2016-12-29 网页编程网 网页编程网

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>网页大转盘抽奖程序</title>
<style type="text/css">
 *{ margin: 0; padding: 0; font-size:12px;}
body{ background-color: #2C1914;font-family:"宋体"; }
a img, ul, li { list-style: none; }
a{text-decoration:none; outline:none; font-size:12px;}
input, textarea, select, button { font-size: 100%;}
.abs{ position:absolute;}
.rel{ position:relative;}
.wrap{ min-height:1000px;}
.main{ height:718px; }
.con980{ width:980px; margin:0 auto;}
.header{ width:100%; height:50px;}
.play{ background:url(images/fl01.jpg) no-repeat; width:980px; height:625px; padding:22px 0 0 21px;}
     td{width:187px; height:115px; font-family:"微软雅黑"; background-color:#666; text-align:center; line-height:115px; font-size:80px; }
 .playcurr{ background-color:#F60;}
 .playnormal{ background-color:#666;}
 .play_btn{ width:480px; height:115px; display:block; background-color:#F60;border:0; cursor:pointer; font-family:"微软雅黑";  font-size:40px;}
 .play_btn:hover{ background-position:0 -115px;}
 .btn_arr{ left:255px; top:255px;}
    </style>
</head>
<body>
<div class="wrap">
       <div class="header"></div>
       <div class="main">
          <div class="con980">
              <div class="play rel">
                 <p class="btn_arr abs"><input value="点击抽奖" id="btn1" type="button" onclick="StartGame()" class="play_btn" ></p>
<table class="playtab" id="tb" cellpadding="0" cellspacing="1">
<tr>
    <td>1</td><td>2</td><td>3</td><td>4</td><td>5</td>
</tr>
<tr>
    <td>16</td><td></td><td></td><td></td><td>6</td>
</tr>
<tr>
    <td>15</td><td></td><td></td><td></td><td>7</td>
</tr>
<tr>
    <td>14</td><td></td><td></td><td></td><td>8</td>
</tr>
<tr>
    <td>13</td><td>12</td><td>11</td><td>10</td><td>9</td>
</tr>
</table>
            </div>
        </div>
     </div>
</div>
    <script type="text/javascript">
     /*
      * 删除左右两端的空格
      */
     function Trim(str){
         return str.replace(/(^\s*)|(\s*$)/g, "");
     }
       /*
         * 定义数组
         */
        function GetSide(m,n){
            //初始化数组
            var arr = [];
            for(var i=0;i<m;i++){
                arr.push([]);
                for(var j=0;j<n;j++){
                    arr[i][j]=i*n+j;
                }
            }
            //获取数组最外圈
            var resultArr=[];
            var tempX=0,
             tempY=0,
             direction="Along",
             count=0;
            while(tempX>=0 && tempX<n && tempY>=0 && tempY<m && count<m*n){
                count++;
                resultArr.push([tempY,tempX]);
                if(direction=="Along"){
                    if(tempX==n-1)
                        tempY++;
                    else
                        tempX++;
                    if(tempX==n-1&&tempY==m-1)
                        direction="Inverse"
                }
                else{
                    if(tempX==0)
                        tempY--;
                    else
                        tempX--;
                    if(tempX==0&&tempY==0)
                        break;
                }
            }
            return resultArr;
        }
       var index=0,           //当前亮区位置
       prevIndex=0,          //前一位置
       Speed=300,           //初始速度
       Time,            //定义对象
       arr = GetSide(5,5),         //初始化数组
         EndIndex=0,           //决定在哪一格变慢
         tb = document.getElementById("tb"),     //获取tb对象
         cycle=0,           //转动圈数
         EndCycle=0,           //计算圈数
        flag=false,           //结束转动标志
        quick=0;           //加速
        btn = document.getElementById("btn1")
        function StartGame(){
      clearInterval(Time);
         cycle=0;
         flag=false;
         EndIndex=Math.floor(Math.random()*16);
         //EndCycle=Math.floor(Math.random()*4);
         EndCycle=1;
         Time = setInterval(Star,Speed);
        }
        function Star(num){
            //跑马灯变速
            if(flag==false){
              //走五格开始加速
             if(quick==5){
                 clearInterval(Time);
                 Speed=50;
                 Time=setInterval(Star,Speed);
             }
             //跑N圈减速
             if(cycle==EndCycle+1 && index==parseInt(EndIndex)){
                 clearInterval(Time);
                 Speed=300;
                 flag=true;       //触发结束
                 Time=setInterval(Star,Speed);
             }
            }
            if(index>=arr.length){
                index=0;
                cycle++;
            }
           //结束转动并选中号码
     //trim里改成数字就可以减速，变成Endindex的话就没有减速效果了
         if(flag==true && index==parseInt(Trim('5'))-1){
          quick=0;
          clearInterval(Time);
            }
            tb.rows[arr[index][0]].cells[arr[index][1]].className="playcurr";
            if(index>0)
                prevIndex=index-1;
            else{
                prevIndex=arr.length-1;
            }
            tb.rows[arr[prevIndex][0]].cells[arr[prevIndex][1]].className="playnormal";
            index++;
            quick++;
        }
    </script>
</body>
</html>

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