轉盤抽獎插件機率實作

插件代碼：

function turntableDraw(obj,jsn)
{
    "use strict";
    this.draw = {};
    this.draw.obj = $(obj);
    this.draw.objClass = $(obj).attr("class");
    this.draw.newClass = "rotary"+"new"+parseInt(Math.random()*);
    var _jiaodu = parseInt(/jsn.share);
    var _yuan = *(jsn.weeks || );
    var _str = "";
    var _speed = jsn.speed || "2s";
    var _velocityCurve = jsn.velocityCurve || "ease";
    var _this = this;
    for(var i=;i<=jsn.share;i++)
    {
        _str+="."+this.draw.newClass+i+"{";
        _str+="transform:rotate("+((i-)*_jiaodu+_yuan)+"deg);";
        _str+="-ms-transform:rotate("+((i-)*_jiaodu+_yuan)+"deg);";
        _str+="-moz-transform:rotate("+((i-)*_jiaodu+_yuan)+"deg);";
        _str+="-webkit-transform:rotate("+((i-)*_jiaodu+_yuan)+"deg);";
        _str+="-o-transform:rotate("+((i-)*_jiaodu+_yuan)+"deg);";
        _str+="transition: transform "+_speed+" "+_velocityCurve+";";
        _str+="-moz-transition: -moz-transform "+_speed+" "+_velocityCurve+";";
        _str+="-webkit-transition: -webkit-transform "+_speed+" "+_velocityCurve+";";
        _str+="-o-transition: -o-transform "+_speed+" "+_velocityCurve+";";
        _str+="}";
        _str+="."+this.draw.newClass+i+"stop{";
        _str+="transform:rotate("+((i-)*_jiaodu)+"deg);";
        _str+="-ms-transform:rotate("+((i-)*_jiaodu)+"deg);";
        _str+="-moz-transform:rotate("+((i-)*_jiaodu)+"deg);";
        _str+="-webkit-transform:rotate("+((i-)*_jiaodu)+"deg);";
        _str+="-o-transform:rotate("+((i-)*_jiaodu)+"deg);";
        _str+="}";
    };
    $(document.head).append("<style>"+_str+"</style>");
    _speed = _speed.replace(/s/,"")*;
    this.draw.startTurningOk = false;
    this.draw.goto=function(ind){
        if(_this.draw.startTurningOk){return false};
        _this.draw.obj.attr("class",_this.draw.objClass+" "+_this.draw.newClass+ind);
        _this.draw.startTurningOk = true;
        setTimeout(function(){
            _this.draw.obj.attr("class",_this.draw.objClass+" "+_this.draw.newClass+ind+"stop");
            if(jsn.callback)
            {
                _this.draw.startTurningOk = false;
                jsn.callback(ind);
            };
        },_speed+);
        return _this.draw;
    };
    return this.draw;
};
           

使用方式：

//share份額[數字沒有預設],
//speed速度[機關s,最小0.1s],
//velocityCurve速度曲線[linear勻速，ease慢快慢，ease-in慢慢開始，ease-out慢慢結束，ease-in-out慢快慢等，用的是css3的速度曲線],可以不寫，ease預設值；
//callback回調函數
//weeks幾周[預設2周，可以不寫]

//幾份和回調函數這兩個參數是必填

function callbackA(ind)
{
    alert("第一個回調"+ind);
};

var newdraw =new turntableDraw('.drawBtn',{
    share:,
    speed:"3s",
    velocityCurve:"ease",
    weeks:,
    callback:function(num)
    {
        callbackA(num);
    },
});

$(".drawBtn1").click(function(event) {
    //ajax 
    //這裡的數字即是中獎數字，如果要控制機率就對其進行處理即可，不處理就是相同的随機機率
    newdraw2.goto(parseInt(Math.random()*)+);
});