不太会写文章，html5 大转盘 源码以下：javascript

大转盘抽奖代码

var turnplate = {

divID:"item",

Div: null,

restaraunts: [{text:"50M免费流量包",color:"#FFF4D6"},

{text:"10元",color:"#FFFFFF"},

{text:"谢谢参与",color:"#FFF4D6"},

{text:"5元",color:"#FFFFFF"},

{text:"10M免费流量包",color:"#FFF4D6"},

{text:"20M免费流量包",color:"#FFFFFF"},

{text:"20元",color:"#FFF4D6"},

{text:"30M免费流量包",color:"#FFFFFF"},

{text:"100M免费流量包",color:"#FFF4D6"},

{text:"2元",color:"#FFFFFF"}],

outsideRadius: 192, //大转盘外圆的半径

textRadius: 155, //大转盘奖品位置距离圆心的距离

insideRadius: 68, //大转盘内圆的半径

startAngle: 0, //开始角度

bRotate: false, //false:中止;ture:旋转

rotateFn: function (item) {

var txt = this.restaraunts[item - 1].text

var angles = item * (360 / turnplate.restaraunts.length) - (360 / (turnplate.restaraunts.length * 2));

if (angles < 270) {

angles = 270 - angles;

} else {

angles = 360 - angles + 270;

}

$('#wheelcanvas').stopRotate();

$('#wheelcanvas').rotate({

angle: 0,

animateTo: angles + 1800,

duration: 8000,

callback: function () {

plus.nativeUI.toast('您的抽奖结果是：' + txt + '！');

turnplate.setText('您的抽奖结果是：' + txt + '！');

turnplate.bRotate = !turnplate.bRotate;

}

});

},

setText: function (t) {

this.Div.innerHTML = t;

},

drawRouletteWheel: function () {

this.Div = document.getElementById(this.divID);

var canvas = document.getElementById("wheelcanvas");

if (canvas.getContext) {

//根据奖品个数计算圆周角度

var arc = Math.PI / (turnplate.restaraunts.length / 2);

var ctx = canvas.getContext("2d");

//在给定矩形内清空一个矩形

ctx.clearRect(0, 0, 240, 240);

//strokeStyle 属性设置或返回用于笔触的颜色、渐变或模式

ctx.strokeStyle = "#FFBE04";

//font 属性设置或返回画布上文本内容的当前字体属性

ctx.font = '16px 宋体';

for (var i = 0; i < turnplate.restaraunts.length; i++) {

var angle = turnplate.startAngle + i * arc;

ctx.fillStyle = turnplate.restaraunts[i].color;

ctx.beginPath();

//arc(x,y,r,起始角,结束角,绘制方向) 方法建立弧/曲线(用于建立圆或部分圆)

ctx.arc(211, 211, turnplate.outsideRadius, angle, angle + arc, false);

ctx.arc(211, 211, turnplate.insideRadius, angle + arc, angle, true);

ctx.stroke();

ctx.fill();

//锁画布(为了保存以前的画布状态)

ctx.save();

//----绘制奖品开始----

ctx.fillStyle = "#E5302F";

var text = turnplate.restaraunts[i].text;

var line_height = 17;

ctx.translate(211 + Math.cos(angle + arc / 2) * turnplate.textRadius, 211 + Math.sin(angle + arc / 2) * turnplate.textRadius);

ctx.rotate(angle + arc / 2 + Math.PI / 2);

if (text.indexOf("M") > 0) {//流量包

var texts = text.split("M");

for (var j = 0; j < texts.length; j++) {

ctx.font = j == 0 ? 'bold 20px 宋体' : '16px 宋体';

if (j == 0) {

ctx.fillText(texts[j] + "M", -ctx.measureText(texts[j] + "M").width / 2, j * line_height);

} else {

ctx.fillText(texts[j], -ctx.measureText(texts[j]).width / 2, j * line_height);

}

}

} else if (text.indexOf("M") == -1 && text.length > 6) {//奖品名称长度超过必定范围

text = text.substring(0, 6) + "||" + text.substring(6);

var texts = text.split("||");

for (var j = 0; j < texts.length; j++) {

ctx.fillText(texts[j], -ctx.measureText(texts[j]).width / 2, j * line_height);

}

} else {

ctx.fillText(text, -ctx.measureText(text).width / 2, 0);

}

ctx.restore();

}

}

},

//点击开始抽奖

pointerOnclick: function () {css

var random = Math.floor(Math.random()*9+1);

turnplate.begin(random);html

},

begin: function (num) {

// if (turnplate.bRotate) return;

// turnplate.bRotate = !turnplate.bRotate;

turnplate.rotateFn(num);

turnplate.setText('');

}

};

html5

//

// var info =[{text:"50M免费流量包",color:"#FFF4D6"},

// {text:"10元",color:"#FFFFFF"},

// {text:"谢谢参与",color:"#FFF4D6"},

// {text:"5元",color:"#FFFFFF"},

// {text:"10M免费流量包",color:"#FFF4D6"},

// {text:"20M免费流量包",color:"#FFFFFF"},

// {text:"20元",color:"#FFF4D6"},

// {text:"30M免费流量包",color:"#FFFFFF"},

// {text:"100M免费流量包",color:"#FFF4D6"},

// {text:"2元",color:"#FFFFFF"}];java

window.οnlοad=function(){

turnplate.drawRouletteWheel();

};

canvas

dom