这是一个原生JS、CSS实现的转盘效果（题目在这：http://www.cnblogs.com/arfeizhang/p/turntable.html），花了半个小时左右，准备睡觉，所以先贴一段代码，预计会抽空优化，让它在手机上也能运行；另外，如果看代码的时候有什么问题，请留言。。。
<!DOCTYPE html>
<html> <head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>转盘</title>
<style>
.holder {
width: 550px;
display: block;
margin: 10px auto;
padding: 20px;
border: 3px solid black;
border-radius: 10px;
position: relative;
}
.rotate-pointer {
display: block;
position: absolute;
width: 521px;
line-height: 10px;
top: 270.5px;
left: 37px;
-webkit-transition:all 4s ease-in-out;
}
#rules {
width: 260.5px;
height: 10px;
display: inline-block;
background-color: black;
}
</style>
</head> <body>
<div class="holder">
<img src="https://images0.cnblogs.com/i/636015/201406/151737329993303.jpg" alt="">
<div id="pointer" class="rotate-pointer">
<div id="rules"></div>
</div>
</div>
<script type="text/javascript">
window.onload = function() {
var table = document.getElementsByClassName('holder')[0],
tablePointer = document.getElementById('pointer'),
getRandom = function(min, max) {
max = max || 1000;
min = min || 0;
return Math.floor(Math.random() * (max - min) + min);
},
degree = 0,
min_circle_times = 2,
max_circle_times = 6,
translate = function() {
degree += getRandom(min_circle_times * 360, max_circle_times * 360); requestAnimationFrame(function() {
tablePointer.style.webkitTransform = 'rotate(' + degree + 'deg)';
});
};
table.onclick = translate; };
</script>
</body> </html>
昨天放出上述内容后，收到题目博主的评论，发现好像有些地方不符合需求，恩，又再试了一个版本，这个版本目前是支持手机的，不过还是只能在webkit内核下使用哦，源码如下：
<!DOCTYPE html>
<html> <head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>转盘</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
<style>
body {
margin:0px;
}
.holder {
text-align: center;
overflow: hidden;
display: block;
margin: 10px auto;
border: 3px solid black;
border-radius: 10px;
position: relative;
}
#table {
cursor: pointer;
display: inline-block;
max-width: 521px;
width: 100%;
-webkit-transition:all 4s ease-in-out;
}
</style>
</head> <body>
<div class="holder">
<img id="table" src="//bbsmax.ikafan.com/static/L3Byb3h5L2h0dHBzL2ltYWdlczAuY25ibG9ncy5jb20vaS82MzEwMDkvMjAxNDA2LzE4MTMzNDEyNTgyNTk3NC5wbmc=.jpg" alt="">
</div>
<script type="text/javascript">
window.onload = function() {
var degreeCount = 0,
table = document.getElementById('table'),
table_rect = table.getBoundingClientRect(),
circle_center = {
x: table_rect.width / 2 + table_rect.left,
y: table_rect.height / 2 + table_rect.top
},
min_circle_times = 2,
max_circle_times = 6,
getRandom = function(min, max) {
max = max || 1000;
min = min || 0;
return Math.floor(Math.random() * (max - min) + min);
}, // 根据两点求角度
getDegreeByPoint = function(start, enb) {
var tan1 = (start.y - circle_center.y) / (start.x - circle_center.x),
degree1 = Math.round(360 * Math.atan(tan1) / Math.PI),
tan2 = (enb.y - circle_center.y) / (enb.x - circle_center.x),
degree2 = Math.round(360 * Math.atan(tan2) / Math.PI);
return -(degree1 - degree2);
},
rotate_rings = 0,
rotate = function(degree) {
degree = degree - 0;
if (Number.isNaN(degree)) {
degree = degreeCount += getRandom(min_circle_times * 360, max_circle_times * 360);
} else {
degree += degreeCount;
}
requestAnimationFrame(function() {
table.style.webkitTransform = 'rotate(' + degree + 'deg)';
});
}; // 事件监听器
var InputListener = function(tableId) {
this.tableId = tableId;
this.events = {}; if (window.navigator.msPointerEnabled) {
//Internet Explorer 10 style
this.eventTouchstart = "MSPointerDown";
this.eventTouchmove = "MSPointerMove";
this.eventTouchend = "MSPointerUp";
} else {
this.eventTouchstart = "touchstart";
this.eventTouchmove = "touchmove";
this.eventTouchend = "touchend";
} this._beginListen();
};
InputListener.prototype = {
on: function(event, callback) {
if (!this.events[event]) {
this.events[event] = [];
}
this.events[event].push(callback);
},
emit: function(event, data) {
var callbacks = this.events[event];
if (callbacks) {
callbacks.forEach(function(callback) {
callback(data);
});
}
},
_start: function(event) {
this.emit("start", event);
},
_rotate: function(event) {
this.emit("rotate", event);
},
_stop: function(event) {
this.emit("stop", event);
},
_celebrate: function(event) {
this.emit("celebrate", event);
},
_click: function(event) {
this.emit("click", event);
},
_getPointByEvent: function(event, toucherName) {
toucherName = toucherName || 'touches';
var point = null;
if (window.navigator.msPointerEnabled) {
point = {
x: event.pageX,
y: event.pageY,
time: Date.now()
};
} else {
point = {
x: event[toucherName][0].clientX,
y: event[toucherName][0].clientY,
time: Date.now()
};
}
return point;
},
_beginListen: function() {
var self = this,
table = document.getElementById(this.tableId),
startPoint = null,
movePath = []; // Respond to direction keys
table.addEventListener('click', function(event) {
self._click();
}); table.addEventListener(this.eventTouchstart, function(event) {
if ((!window.navigator.msPointerEnabled && event.touches.length > 1) ||
event.targetTouches > 1) {
return; // Ignore if touching with more than 1 finger
}
startPoint = self._getPointByEvent(event); movePath = [startPoint];
self._start({
start: startPoint
}); event.preventDefault();
}); table.addEventListener(this.eventTouchmove, function(event) {
var endpoint = self._getPointByEvent(event);
if ( !! endpoint) {
movePath.push(endpoint);
self._rotate({
degree: getDegreeByPoint(startPoint, endpoint),
start: startPoint,
end: endpoint
});
}
event.preventDefault();
}); table.addEventListener(this.eventTouchend, function(event) {
if ((!window.navigator.msPointerEnabled && event.touches.length > 0) ||
event.targetTouches > 0) {
return; // Ignore if still touching with one or more fingers
}
var endpoint = self._getPointByEvent(event, 'changedTouches'),
countToCal = 3,
len = movePath.length; self._stop({
degree: getDegreeByPoint(startPoint, endpoint),
start: startPoint,
end: endpoint
});
movePath.push(endpoint);
if (len <= 3) {
self._click({
start: startPoint
});
} else {
var p1 = movePath[len - 1],
p2 = movePath[len - 1 - 3],
// 转动的弧度
degree = getDegreeByPoint(p2, p1),
time = p1.time - p2.time,
speed = degree / time * 1000,
// 速度转换为期望的周数，4指的是CSS动画时间
expectDegree = (speed * 4) + min_circle_times;
self._celebrate({
start: p2,
end: p1,
degree: expectDegree
});
}
event.preventDefault();
});
}
}; var listener = new InputListener('table');
listener.on('start', function(e) {
table.style.webkitTransition = 'all 0s';
}); listener.on('rotate', function(e) {
console.log(e.degree);
rotate(e.degree);
}); listener.on('stop', function(e) {
degreeCount += e.degree;
//degreeCount = degreeCount % 360;
table.style.webkitTransition = 'all 4s ease-in-out';
}); listener.on('celebrate', function(e) {
rotate(e.degree);
}); listener.on('click', rotate);
};
</script>
</body> </html>
一个可以在线运行的地址：http://www.w3cfuns.com/home.php?mod=space&uid=5446932&do=blog&quickforward=1&id=5398670