JS實現轉動隨機數抽獎的特效代碼

2019-11-20 11:55:22

字體：大中小

來源：轉載

供稿：網友

大家都玩過抽獎游戲，或者夢想抽到大獎吧，但是有沒有想過抽獎游戲是怎么實現的吶？今天就給大家分享一款轉動隨機數抽獎的JS特效代碼。

實現代碼如下

<!Doctype html><html><head><meta http-equiv="Content-Type" content="text/html; charset=GBK"><script src="http://code.jquery.com/jquery-1.7.1.js" type="text/javascript"></script><style type="text/css">body,h1,h2,h3,h4,h5,h6,p,ul,ol,li,form,img,dl,dt,dd,table,th,td,blockquote,fieldset,div,strong,label,em{margin:0;padding:0;border:0;}ul,ol,li{list-style:none;}input,button{margin:0;font-size:12px;vertical-align:middle;}body{font-size:12px;font-family:Arial, Helvetica, sans-serif; text-align:center; margin:0 auto; background:url(../images/BG.jpg) repeat-y;}table{border-collapse:collapse;border-spacing:0;}.box{ padding:9px 0 0 11px; width:759px; height:611px; background:#ccc; margin:20px auto; }.inbox{ width:751px; height:596px;position:relative;}#random_box li{ position:absolute; width:144px; overflow:hidden; height:144px; border:3px solid #c7c5ca; background:#fff;}#random_box li img{ width:144px; display:block; height:144px;}.ok{ display:block; width:442px; height:294px; background:#c00; color:#fff; font-size:48px; position:absolute; top:149px; left:148px; cursor:pointer; text-align:center; line-height:280px;}#random_1{ left:0; top:0;}#random_2{ left:148px;top:0;}#random_3{ left:296px;top:0;}#random_4{ left:444px;top:0;}#random_5{ left:592px;top:0; }#random_6{ left:592px;top:148px;}#random_7{ left:592px; top:298px;}#random_8{ left:592px; top:446px;}#random_9{ left:444px; top:446px;}#random_10{ left:296px; top:446px;}#random_11{ left:148px; top:446px;}#random_12{ left:0; top:446px;}#random_13{ left:0; top:298px;}#random_14{ left:0; top:148px;}#random_box li.random_current{border:1px solid red;}</style></head><body><div class="box"> <div class="inbox"> <ul id="random_box"> <li id="random_1">1</li> <li id="random_2">2</li> <li id="random_3">3</li> <li id="random_4">4</li> <li id="random_5">5</li> <li id="random_6">6</li> <li id="random_7">7</li> <li id="random_8">8</li> <li id="random_9">9</li> <li id="random_10">10</li> <li id="random_11">11</li> <li id="random_12">12</li> <li id="random_13">13</li> <li id="random_14">14</li>  </ul> <b class="ok" onClick="StartGame()">抽獎</b> </div></div><script>var index=1,   //當前亮區位置prevIndex=14,   //前一位置Speed=300,   //初始速度Time,   //定義對象arr_length = 14; //GetSide(5,5),   //初始化數組EndIndex=1,   //決定在哪一格變慢cycle=0,   //轉動圈數 EndCycle=3,   //計算圈數flag=false,   //結束轉動標志random_num=1,  //中獎數quick=0;   //加速  function StartGame(){$("#random_box li").removeClass("random_current"); //取消選中 //random_num = parseInt($("#txtnum").val());// random_num = Math.floor(Math.random()*13+2); //產出隨機中獎數2--12之間 index=1; //再來一次,從1開始 cycle=0; flag=false; //EndIndex=Math.floor(Math.random()*12); if(random_num>5) { EndIndex = random_num - 5; //前5格開始變慢 } else { EndIndex = random_num + 14 - 5; //前5格開始變慢 } //EndCycle=Math.floor(Math.random()*3); Time = setInterval(Star,Speed); }function Star(num){ //跑馬燈變速 if(flag==false){  //走五格開始加速  if(quick==5){   clearInterval(Time);   Speed=50;   Time=setInterval(Star,Speed);  }  //跑N圈減速  if(cycle==EndCycle+1 && index-1==EndIndex){  clearInterval(Time);   Speed=300;   flag=true;   //觸發結束   Time=setInterval(Star,Speed);  } }  if(index>arr_length){  index=1;  cycle++; }  //結束轉動并選中號碼 if(flag==true && index==parseInt(random_num)){   quick=0;  clearInterval(Time); } $("#random_"+index).addClass('random_current'); //設置當前選中樣式 if(index>1)  prevIndex=index-1; else{  prevIndex=arr_length; } $("#random_"+prevIndex).removeClass('random_current'); //取消上次選擇樣式  index++; quick++;}</script></body></html>

實現的效果圖：