JavaScript簡單抽獎程式的實現及程式碼

魏曉峰的部落格發表於2015-05-10
JavaScript

1.需求說明

某公司年終抽獎，需要有如下功能

1）可以根據實際情況設定到場人數的最大值

2） 點選“開始”，大螢幕滾動，點選“停止”，獲獎者的編號出現在大螢幕上

3）在介面裡顯示全部獎項獲獎人編號

4）不重複獲獎

5）不會因為輸入錯誤而導致抽獎結果異常。

2.程式碼呈上

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 TRANSITIONAL//EN">   
<html>   
<head>   
<title>某公司週年慶抽獎</title>   
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">   
<script language="javascript">   
    var timer;   
    var flag = new Array(100);   
    var existingnum = new Array(100);   
    var clickTimes = 0;   
    var randnum;   
    var cellnum =1;   
    var mobile;   
    var num ;   
    function check_input(){     
        var input = document.getElementById("real_num").value;   
        var re = /^[1-9]+[0-9]*]*$/;   
        if (!re.test(input)){     
            alert("請輸入正整數");     
            window.location.href=window.location.href;      
            return false;     
         }   

    }     

    //get the random numbers from the mobile array every 0.05s   
    function setTimer(){   
        timer = setInterval("getRandNum();",50);   
        document.getElementById("start").disabled = true;   
        document.getElementById("end").disabled = false;   
    }   

    function getRandNum(){   
        document.getElementById("result").value = mobile[GetRnd(0,num)];   
    }   

    function GetRnd(min,max){    
        randnum = parseInt(Math.random()*(max-min+1));   
        return randnum;   
    }   

    //------------------------------------------------   

    //turn the input's running down   
    function clearTimer(){   
        noDupNum();   
        clearInterval(timer);   
        document.getElementById("start").disabled = false;   
        document.getElementById("end").disabled = true;   
    }   
    // Re defined array:change the length of the array and delete the checked one   
    function noDupNum(){   
        mobile.removeEleAt(randnum);   
        var o = 0;   
        for(p=0; p<mobile.length;p++){   
            if(typeof mobile[p]!="undefined"){   
                mobile[o] = mobile[p];   
                o++;   
            }   
        }   
        num = mobile.length-1;   
     }   

     function setValues(){   
        document.getElementById(cellnum).value = document.getElementById("result").value ;   
        cellnum++;   
    }   

    function set_array(){   
        var real_num = document.getElementById("real_num").value ;   
        mobile= new Array(real_num);   
        var o = 0;   
        for(i=1; i<=real_num;i++){   
            mobile[o] = i;   
            o++;   
        }   
        num = mobile.length-1;   
        document.getElementById("set_number").disabled = true;   
    }   

    Array.prototype.removeEleAt = function(dx){   
        if(isNaN(dx)||dx>this.length){return false;}   
            this.splice(dx,1);   
        }   
</script>   
</head>   
<body>   
    <center>   
        <div id="main">   
            <div>   
                <h1>獲獎小夥伴</h1>   
                <p>   
                    <input id="result" type="text" size="30" style="height:130px;width:800px;border:2px solid red;font-size:120;" readonly/>   
                </p>   
                <p>   
                    <input id="start" type="button" value="開始" style="border: 1px solid; border-color: #aaa 000 #000 #aaa;width:4em; background: #fc0;" onclick="setTimer()" />   
                    <input id="end" type="button" value="停" style="border: 1px solid; border-color: #aaa 000 #000 #aaa;width:4em; background: #fc0;"onclick="clearTimer();setValues();" disabled/>   
                </p>   
                <p><strong>一等獎（1名）</strong></p>   
                <table width="190" height="30" border="1">   
                    <tr>   
                        <td><input name="text1" type="text" id="3" style="height:30px;width:190px;border:1px solid red;font-size:25;" size="28" readonly/></td>   
                    </tr>   
                </table>   
                <p>二等獎（2名）</p>   
                <table width="380" height="30" border="1">   
                    <tr>   
                        <td><input name="text2" type="text" id="2" style="height:30px;width:190px;border:1px solid red;font-size:25;" size="28" readonly/></td>   
                        <td><input name="text3" type="text" id="1" style="height:30px;width:190px;border:1px solid red;font-size:25;" size="20" readonly/></td>   
                    </tr>   
                </table>   
            </div>   
        </div>   
        <p></p>   
        <p></p>   
        <div id="setter" style="border:1px solid;width:45em">   
            <h3>系統設定</h3>   
            <table width="300" height="30" border="1">   
                    <tr>   
                        <td>活動人數</td>   
                        <td><input type="text" id="real_num" style="width:11em"></td>   
                        <td><input id="set_number" type="button" value="設定" style="border: 1px solid; border-color: #aaa 000 #000 #aaa;width:4em; background: #fc0;" onclick="check_input();set_array();"/></td>   
                    </tr>   
                    <tr>   

                    </tr>   
            </table>   
            <br/>   
            <input id="set_number" type="button" value="重新開始抽獎" style="border: 1px solid; border-color: #aaa 000 #000 #aaa;width:45em;height: 3em;background: #fc0;"  onclick="window.location.href=window.location.href;"/>   
            <p></p>   
        </div>   
    <center>   
</body>   
</html>

3.醜陋截圖

我很醜，但是我很溫柔~

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