js 转盘抽奖

#bg img:last-child { width: 650px; height: 600px; margin: 0 auto; background: url(turntable-bg.jpg) no-repeat; position: relative; } .explain{ position: absolute; z-index: 10; top: 155px; left: 247px; } .explain p:first-child{ position: absolute; z-index: 5; top: 60px; left: 116px; transition: all 4s; } <div id="bg"><img src="/images/pointer.png" alt="pointer"><img src="/images/turntable.png" alt="turntable"></div> var cat = 51.4; //总共7个扇形区域，每个区域约51.4度 var num = 0; //转圈结束后停留的度数 var offOn = true; //是否正在抽奖 var rdmNew = 0;//需要度数 var rdmTwo = 0 //上一次度数 $("#bg img:first-child").click(function () { offOn = !offOn; ratating(); } //旋转 function ratating() { var rdm = 0;//随机度数 rdmNew = rdmTwo; var timer = null; clearInterval(timer); timer = setInterval(function () { if (Math.floor(rdm / 360) < 5) { rdm = Math.floor(Math.random() * 3600); } else { rdmNew = rdm + rdmNew; //本次需要度数=随机度数+初始度数 $("#bg img:last-child").css({ "transform": "rotate(" + rdmNew + "deg)" }); clearInterval(timer); setTimeout(function () { offOn = !offOn; num = rdmNew % 360; rdmTwo = rdmNew; // var ran=Math.ceil(Math.random()*100) // if(ran<55){ //通过概率判断选取数字 // var needNum= Math.ceil(Math.random()*5) // }else if(55<ran<95){ // var needNum= Math.ceil(Math.random()*5+5) // }else if(95<ran<100){ // var needNum= Math.ceil(Math.random()*5+10) if (num <= cat * 1) {console.log("rdm=" + rdm + "，num=" + num + "，" + "4999元"); } else if (num <= cat * 2) {console.log("rdm=" + rdm + "，num=" + num + "，" + "50元"); } else if (num <= cat * 3) {console.log("rdm=" + rdm + "，num=" + num + "，" + "10元"); } else if (num <= cat * 4) {console.log("rdm=" + rdm + "，num=" + num + "，" + "5元"); } else if (num <= cat * 5) {console.log("rdm=" + rdm + "，num=" + num + "，" + "免息服务"); } else if (num <= cat * 6) {console.log("rdm=" + rdm + "，num=" + num + "，" + "提交白金"); } else if (num <= cat * 7) {console.log("rdm=" + rdm + "，num=" + num + "，" + "未中奖"); } }, 4000); } }, 30); }