Js实现抽奖转盘，和点击返回某个模块顶部的功能

最近写了几个转盘抽奖的活动页面:

1.设定旋转的角度：

HTML部分：
转盘代码：
    <div class="lottery">
                <div class="lottery_box">
                    <div class="flash-light flash"></div>
                    <div class="lottery_cont" id="lottery_cont"></div>
                       <div class="lottery_btn" id="lottery_btn"></div>
                </div>
            </div>

立即注册弹窗：

<div class="popup">
<div class="popup-img" >
<div class="popup-btn"></div>
<div class="close">X</div>
</div>

</div>

/** lottery css **/
.lottery {
    position: absolute;
    text-align: center;
    height: 549px;
    width: 100%;
    background: url(images/lottery-bg.png) no-repeat top center;
    z-index: 4; 
    top: 20%;
}
.lottery_cont{
position: absolute;
    height: 445px;
    width: 444px;
    background: url(images/lottery.png) no-repeat top center;
    z-index: 4;
    top: 52px;
    left: 50%;
    margin-left: -223px;
   transition: all .2s ease-out;
   -webkit-transition:all .2s ease-out;
}
.lottery_btn{
position: absolute;
    height: 126px;
    width: 94px;
    background: url(images/lot-btn.png) no-repeat top center;
    z-index: 4;
    top: 35.6%;
    left: 50%;
    margin-left: -48px;
    cursor: pointer;
}
.lottery_btn:hover{
    transform: scale(1.1);
}

/**popup css **/
.popup {
    position: absolute;
    top: 0px;
    width: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 10;
    height: 100%;
    text-align: center;
    padding: 10% 0;
    display: none;
}
.popup-img{background: url(images/popup.png)top center no-repeat;width:481px;height:590px;margin: 0 auto;position: relative; }
.popup-btn{    position: absolute;
    width: 86%;
    bottom: 0%;
    left: 8%;
    height: 12%;
    cursor: pointer;}
.box {position: relative;}
.close {
    position: absolute;
    top: 0;
    color: #fff;
    font-size: 30px;
    right: -50%;
    cursor: pointer;
}

JS部分：
    var currentdeg=0;  //初始化角度
   function get_ram(){
        var willdeg=360+(parseInt(Math.random()*10)*36); 
        return willdeg;
    }
    // var speed=willdeg/5;
       $('#lottery_btn').click(function(){
        var willdeg = get_ram();
      content.style.transform="rotate("+willdeg+"deg)";
        var enddeg=content.style.transform.slice(7);
         enddeg=willdeg-360;
          console.log(enddeg);
       var timer=setTimeout(function(){
            if(45<enddeg&&enddeg<=135){
                $(".popup").show(500);
                $(".popup-btn").addClass('popup-real');
                
            }
            else if(135<enddeg&&enddeg<=225){
                 $(".popup").show(500);
                $(".popup-btn").removeClass('popup-real');
            }
            else if(225<enddeg&&enddeg<=315){
            
                $(".popup").show(500);
                $(".popup-btn").addClass('popup-real');
                 
            }
            else if(0<=enddeg&&enddeg<=45||315<enddeg&&enddeg<=360){
                  $(".popup").show(500);
                  $(".popup-btn").removeClass('popup-real');
                 

                
            }
        },2000);


    });

 $(".close").click(function(){
     $(".popup").fadeOut(1000);
    content.style.transform="rotate(0deg)";
    });
  

此外滑到固定div的js代码为：

       $(".demo,.real,.popup-btn").click(function(){
         $('html,body').animate({scrollTop:$('#register').offset().top},2000);
                });

添加加载进度条功能：

<div id="loading">
<img src="images/loading.gif">
</div>
<style>
div#loading {width: 100%;height: 100%;position: fixed;background:#fff;z-index: 100000;text-align: center;}
 div#loading img{width: auto;position: fixed;top: 50%;}
</style>
<script>
$(window).on('load',function(){
    $("#loading").hide();
});
<script>