javascript 转盘抽奖代码和计数器代码

时间:2022-01-02 06:19:12
要介绍了javascript圆盘抽奖程序实现原理和完整代码例子,需要的朋友可以参考下
 看到网页上有不少大转盘抽奖的应用,心血来潮也想弄个.于是找了点资料自己研究... 

效果预览:

javascript 转盘抽奖代码和计数器代码

一、模拟抽奖的实现过程

旋转原理:当支持CSS3属性采用transform: rotate(角度deg)设置,当角度为正数时顺时针旋转,当为负数时逆时针旋转。如果是IE8及其以下,采用采用绝对定位设置top和left,模拟角度旋转。

run方法,参数angle指角度

复制代码代码如下:
function run(angle) {
                    if (isIE) {
                        cosDeg = Math.cos(angle * Math.PI / 180);
                        sinDeg = Math.sin(angle * Math.PI / 180);
                        with (target.filters.item(0)) {
                            M11 = M22 = cosDeg; M12 = -(M21 = sinDeg);
                        }
                        target.style.top = (orginH - target.offsetHeight) / 2 + "px";
                        target.style.left = (orginW - target.offsetWidth) / 2 + "px";
                    } else if (target.style.MozTransform !== undefined) {
                        target.style.MozTransform = "rotate(" + angle + "deg)";
                    } else if (target.style.OTransform !== undefined) {
                        target.style.OTransform = "rotate(" + angle + "deg)";
                    } else if (target.style.webkitTransform !== undefined) {
                        target.style.webkitTransform = "rotate(" + angle + "deg)";
                    } else {
                        target.style.transform = "rotate(" + angle + "deg)";
                    }
                }

模拟转盘加速,匀速和减速。当角度小于某个数值时,让其处于加速此处采用1.01的系数作为加速度,当大于某个数值时处于高速匀速状态,当角度大于设置的最大数值时,让其减速采用系数为0.99。设置负数作为减速的值(即变量 tmp),随即获取负360中的值(即变量 m),当大于这个值时,转盘停止。

复制代码代码如下:
var tmp = -900;
                var m = -parseInt(Math.random() * 360);
                timer = setInterval(function () {
                    if (i > 3000) {
                        tmp = parseInt(tmp * 0.99);
                        if (tmp > m) {
                            tmp = m;
                            clearInterval(timer);
                            msg(m);
                        }
                        run(tmp);
                    }
                    else if (i > 1000) {
                        i = i + 45;
                        run(i);
                    }
                    else {
                        i = parseInt((i + 1) * 1.01);
                        run(i);
                    }
                }, 50);

启动抽奖和重新设置抽奖

复制代码代码如下:
<input id="test" type="button" value="抽奖" />
<input id="restart" style="display: none;" type="button" value="再抽一次" />
m$('test').onclick = function () {
                m$('test').style.display = "none";
                showMsg();
            }

m$('restart').onclick = function () {
                m$('restart').style.display = "none";

if (isIE) {
                    m$("demo").style.top = "0px";
                    m$("demo").style.left = "0px";
                } else if (m$("demo").style.MozTransform !== undefined) {
                    m$("demo").style.MozTransform = 'rotate(0deg)';
                } else if (m$("demo").style.OTransform !== undefined) {
                    m$("demo").style.OTransform = 'rotate(0deg)';

} else if (m$("demo").style.webkitTransform !== undefined) {
                    m$("demo").style.webkitTransform = 'rotate(0deg)';
                } else {
                    m$("demo").style.transform = 'rotate(0deg)';
                }

m$('test').style.display = "block";
                i = 0;
            }

二、完整代码demo:

复制代码代码如下:
<!DOCTYPE html>
<html>
<head>
    <title>抽奖</title>
    <style type="text/css">
        #container{width: 400px;height: 400px;position: relative;margin: 0 auto;}
        #demo{position: absolute;filter: progid:DXImageTransform.Microsoft.Matrix(sizingmethod="auto expand");}
    </style>
</head>
<body style="height: 1000px;">
    <div id="container">
        <div id="demo">
            <img alt="" src="//bbsmax.ikafan.com/static/L3Byb3h5L2h0dHAvZmlsZXMuamI1MS5uZXQvZmlsZV9pbWFnZXMvYXJ0aWNsZS8yMDE0MDYvMjAxNDYzOTQ4MTkyNzkucG5nPzIwMTQ1Mzk0OTI2.jpg" width="400" height="400" />
        </div>
    </div>
    <input id="test" type="button" value="抽奖" />
    <input id="restart" style="display: none;" type="button" value="再抽一次" />
    <div id="msg">
    </div>
    <script type="text/javascript">
        var m$ = function (id) { return document.getElementById(id); }
        var ua = navigator.userAgent;
        var isIE = /msie/i.test(ua) && !window.opera;

var i = 1, sinDeg = 0, cosDeg = 0, timer = null;
        var mRotate = function () {
            var rotate = function (target, msg) {
                target = m$(target);
                var orginW = target.clientWidth, orginH = target.clientHeight;
                clearInterval(timer);
                function run(angle) {
                    if (isIE) {
                        cosDeg = Math.cos(angle * Math.PI / 180);
                        sinDeg = Math.sin(angle * Math.PI / 180);
                        with (target.filters.item(0)) {
                            M11 = M22 = cosDeg; M12 = -(M21 = sinDeg);
                        }
                        target.style.top = (orginH - target.offsetHeight) / 2 + "px";
                        target.style.left = (orginW - target.offsetWidth) / 2 + "px";
                    } else if (target.style.MozTransform !== undefined) {
                        target.style.MozTransform = "rotate(" + angle + "deg)";
                    } else if (target.style.OTransform !== undefined) {
                        target.style.OTransform = "rotate(" + angle + "deg)";
                    } else if (target.style.webkitTransform !== undefined) {
                        target.style.webkitTransform = "rotate(" + angle + "deg)";
                    } else {
                        target.style.transform = "rotate(" + angle + "deg)";
                    }
                }

var tmp = -900;
                var m = -parseInt(Math.random() * 360);
                timer = setInterval(function () {
                    if (i > 3000) {
                        tmp = parseInt(tmp * 0.99);
                        if (tmp > m) {
                            tmp = m;
                            clearInterval(timer);
                            msg(m);
                        }
                        run(tmp);
                    }
                    else if (i > 1000) {
                        i = i + 45;
                        run(i);
                    }
                    else {
                        i = parseInt((i + 1) * 1.01);
                        run(i);
                    }
                }, 50);
            }
            return { rotate: rotate }
        } ();

function showMsg() {
            mRotate.rotate("demo", function msg(m) {
                if (m > -90 && m < -30) {
                    m$("msg").innerHTML += "22222222";
                }
                else if (m > -150 && m < -90) {
                    m$("msg").innerHTML += "333333333";
                }
                else if (m > -210 && m < -150) {
                    m$("msg").innerHTML += "444444";
                }
                else if (m > -270 && m < -210) {
                    m$("msg").innerHTML += "5555555";
                }
                else if (m > -330 && m < -270) {
                    m$("msg").innerHTML += "6666666";
                } else {
                    m$("msg").innerHTML += "111111111";
                }
                m$('restart').style.display = "block";
            });
        }

window.onload = function () {
            m$('test').onclick = function () {
                m$('test').style.display = "none";
                showMsg();
            }

m$('restart').onclick = function () {
                m$('restart').style.display = "none";

if (isIE) {
                    m$("demo").style.top = "0px";
                    m$("demo").style.left = "0px";
                } else if (m$("demo").style.MozTransform !== undefined) {
                    m$("demo").style.MozTransform = 'rotate(0deg)';
                } else if (m$("demo").style.OTransform !== undefined) {
                    m$("demo").style.OTransform = 'rotate(0deg)';

} else if (m$("demo").style.webkitTransform !== undefined) {
                    m$("demo").style.webkitTransform = 'rotate(0deg)';
                } else {
                    m$("demo").style.transform = 'rotate(0deg)';
                }

m$('test').style.display = "block";
                i = 0;
            }
        }
    </script>
</body>
</html>

该方法的关键是Cookie技术和动态图像特性的综合运用。使用Cookie,可以在用户端的硬盘上记录用户的数据,下次访问此站点时,即可读取用户端硬盘的Cookie,直接得知来访者的身份和访问次数等有关信息。JavaScript中通过document.cookie属性访问Cookie,这个属性包括名字、失效日期、有效域名、有效URL路径等。用等号分开的名字和其值是Cookie的实际数据,本例中用来存储该访问者访问该页面的次数。通过把Web页中的图像映射到一个Images数组,一定条件下修改该数组项的特性,可以实现动态图像显示。本例中,首先预载入一组图像,每次调用该Web页时,随机产生新的一组图像,通过覆盖原图像实现动态的趣味性效果。

  源程序count.html

 < html>

  < head>

  < meta http-equiv=″Content-Type″

  content=″text/html; charset=gb2312″>

  < title>趣味计数器< /title>

  < /head>

  < body>

  < p>< script language=″JavaScript″>

  var expdays=60;

  var exp=new Date();

  exp.setTime(exp.getTime()

  (expdays*24*60*60*1000));

  function count(info){

  //若是该访客的第一次访问,将计数器值赋1,否则加1累积

  var wwhcount=getcookie(′wwhcount′);

  if (wwhcount==null){

  wwhcount=1;

  }

  else{wwhcount++;}

  setcookie(′wwhcount′,wwhcount,exp);

  return countdisp(wwhcount)

  }

  function countdisp(countvar){

  //实现随机显示,不足6位以0补全,可以自己调整显示位数

  var countvar1=″000000″+countvar;

  var howFar1=countvar1.length;

  countvar1=countvar1.substring(howFar1, howFar1-1)

  var index=″ ″+Math.floor(Math.random()*10);

  if (index==″10″){

  index=″0″};

  for (var icount=0;icount< 6;icount++){

  var g=countvar1.substring(icount,icount+1);

  document.images[icount].src=″http:

  //localhost/images/″+index+g+″.gif″;

  }

  }

  function getCookieVal(offset){

  //获取该访问者的已访问次数

  var endstr=document.cookie.indexOf(″;″,offset);

  if (endstr==-1)

  endstr=document.cookie.length;

  return unescape(document.cookie.substring(offset,endstr));

  }

  function getcookie(name){

  //截取Cookie中的name信息段

  var arg=name+″=″;

  var alen=arg.length;

  var clen=document.cookie.length;

  var i=0;

  while (i< clen){

  var j=i+alen;

  if (document.cookie.substring(i,j)==arg)

  return getCookieVal(j);

  i=document.cookie.indexOf(″ ″,i)+1;

  if (i==0) break;}

  return null;

  }

  function setcookie(name,value){

  //存储该访客计数器的数值

  var argv=setcookie.arguments;

  var argc=setcookie.arguments.length;

  var expires=(argc>2)?argv[2]:null;var path=(argc>3)?argv[3]:null;

  var domain=(argc>4)?argv[4]:null;

  var secure=(argc〉5)?argv[5]:false;

  document.cookie=name+″=″+escape(value)

  +((expires==null)?″ ″:(″;expires=″+expires.toGMTString()))

  +((path==null)?″ ″:(″;path=″+path))+((domain==null)?″

  ″:(″;domain=″+domain))+((secure==true)?″;secure″:″ ″);

  }

  function deletecookie(name){

  //使该信息行失效,删除该用户关于访问次数的信息

  var exp=new Date();

  exp.setTime(exp.getTime()-1);

  var cval=getcookie(name);

  document.cookie=name+″=″+cval+″;expires=″+exp.toGMTString();

  }

  < /script>< /p>

  < ! --预载入图像数组-->

  您是第 < img src=″http://localhost/images/00.gif″ height=20 width=20>

  < img src=″http://localhost/images/00.gif″

  height=20 width=20>

  < img src=″http://localhost/images/00.gif″

  height=20 width=20>

  < img src=″http://localhost/images/00.gif″

  height=20 width=20>

  < I mg src=″http://localhost/images/00.gif″

  height=20 width=20>

  < img src=″http://localhost/images/00.gif″

  height=20 width=20>次光临!

  < script language=″JavaScript″>

  //调用count()函数,实现计数器的动态图像显示

  count();

  < /script>

  < /body>

  < /html>

  注意事项

  由于使用了JavaScript语言,因此该方法具有与应用平台的无关性,可以适用于Unix、Windows等多种平台。另外,此计数器不同于一般意义上的访客计数器,专门用于记录某一访客对某一网站的访问次数。

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