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JavaScript简单抽奖程序的实现代码分享

来源：微智科技网

1.需求说明

某公司年终抽奖，需要有如下功能

1）可以根据实际情况设置到场人数的最大值

2）点击“开始”，大屏幕滚动，点击“停止”，获奖者的编号出现在大屏幕上

3）在界面里显示全部奖项获奖人编号

4）不重复获奖

5）不会因为输入错误而导致抽奖结果异常。

2.代码呈上

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 TRANSITIONAL//EN"> 
<html> 
<head> 
<title>某公司周年庆抽奖</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("请输入正整数"); 
 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> 
 <p id="main"> 
 <p> 
 <h1>获奖小伙伴</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="开始" 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>一等奖（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>二等奖（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> 
 </p> 
 </p> 
 <p></p> 
 <p></p> 
 <p id="setter" style="border:1px solid;width:45em"> 
 <h3>系统设置</h3> 
 <table width="300" height="30" border="1"> 
 <tr> 
 <td>活动人数</td> 
 <td><input type="text" id="real_num" style="width:11em"></td> 
 <td><input id="set_number" type="button" value="设置" 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="重新开始抽奖" 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> 
 </p> 
 <center> 
</body> 
</html>

3.丑陋截图

我很丑，但是我很温柔~