利用Javascript实现简单的转盘抽奖

2019-11-19 17:36:38

字体：大中小

来源：转载

供稿：网友

首先来看看接口说明：

var _rotate = new iRotate('#div',{ start : 0, //开始角度，可不写，默认0 end :45, //结束角度 time :5000, //持续时间，可不写，默认1000 easing : 'easeOut', //动画形式，目前只有'linear'和'easeOut'两种，可不写，默认'easeOut' callback : function(){ //回调函数  //this为当前对象 }});_rotate.stop(function(){ //停止回调函数 //this为当前对象});

实现的效果图如下：

完整的示例代码如下：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>简单转盘效果</title><style>#RotateDiv{border-radius:50px 0 50px 50px }#RotateDiv,#RotateDiv2{ width: 50px;height: 50px; color: #fff;text-align: center; line-height: 50px; background: #444; position: relative; margin: 20px;border-radius:50px 0 50px 50px}</style></head><body><p>举例子：</p><p> <button id="RotateBtn">开始抽奖</button> </p><div id="RotateDiv"></div><p>默认转动：</p><p> <button id="RotateBtn2">开始抽奖2</button> </p><div id="RotateDiv2"></div><script type="text/javascript">window.iRotate = (function(w,d){ function R(obj,json){ this.obj = (typeof obj=='object') ? obj : d.querySelector(obj); this.startTime = Date.now(); this.timer = null; this.rotate(json); }; R.prototype = { rotate : function(json){ var t = this,times = json['time'] || 1000; clearInterval(t.timer) t.timer = setInterval(function(){ var changeTime = Date.now(), tm = times - Math.max(0,t.startTime - changeTime + times), value = Tween[json['easing'] || 'easeOut'](tm,+json['start'] || 0,json['end'] - (+json['start'] || 0),times); t.obj.style['transform'] = t.obj.style['-webkit-transform'] = 'rotate('+value%360+'deg)'; t.obj.setAttribute('data-rotate',value%360) if(tm==times){  clearInterval(t.timer);  json.callback && json.callback.call(t.obj) } },10) }, stop : function(fn){ clearInterval(this.timer); fn && fn.call(this.obj) } }; return R;})(window,document);var Tween = {linear: function (t, b, c, d){return c*t/d + b;},easeOut: function(t, b, c, d){return -c *(t/=d)*(t-2) + b;}}//默认转动;(function(){ var off = true,off2 = true; RotateBtn.onclick = function(){ if(!off) return //判断是否在旋转 off = false new iRotate('#RotateDiv',{ end :45+1800, time :5000, callback : function(){ //回调函数  this.innerHTML = this.getAttribute('data-rotate')  off = true  } }); } var r = null; function rotate2(){ //递归持续旋转 r = new iRotate('#RotateDiv2',{ start : 0, end :360, time :1000, easing : 'linear', callback : function(){ rotate2() } }); } rotate2() RotateBtn2.onclick = function(){ if(!off2) return //判断是否在旋转 off2 = false r.stop(); //停止之前的旋转 new iRotate('#RotateDiv2',{ start : RotateDiv2.getAttribute('data-rotate'), end :65+1800, time :5000, callback : function(){ //回调函数  this.innerHTML = this.getAttribute('data-rotate')  off2 = true  } }); }})(); </script></body></html>

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