js简单抽奖代码

核心：js的Math对象和Array对象

<！DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>random</title> <style>#awardListDom{width: 100%;} </style></head><body> <label for="awardListDom">奖项列表</label><br> <input type="text" value="" id="awardListDom"> <br> <label for="num">抽到的奖</label><br> <input type="text" value="" id="num"> <br> <button id="submit">开始抽奖</button> <script>/* * 思路：随机抽奖，抽一个奖项便减少一个* Math 对象方法：http://www.w3school.com.cn/jsref/jsref_obj_math.asp*-random（）:返回 0 ~ 1 之间的随机数。*-floor（）:获取整数* 数组操作：*- splice（x,y）; x:起始位置， y:获取并删除个数*/function random（min,max）{return Math.floor（min+Math.random（）*（max-min））;}var awardListDom=document.getElementById（"awardListDom"）,num=document.getElementById（"num"）,submit=document.getElementById（"submit"）;var awardList=["一等奖","二等奖","二等奖","三等奖","三等奖","三等奖","鼓励奖","鼓励奖","鼓励奖","鼓励奖","谢谢参与","谢谢参与","谢谢参与","谢谢参与","谢谢参与","谢谢参与"];awardListDom.value=awardList;submit.onclick=function（）{ //引用数组 var oldArray=awardList; var rNum=random（0,oldArray.length）;if（oldArray.length<1）{awardListDom.value="活动结束";num.value="活动结束"; } else{num.value=oldArray[rNum];oldArray.splice（rNum,1）;awardListDom.value=oldArray; }} </script></body></html>

demo:http://demo.jb51.net/js/2015/choujiang/
github:https://github.com/litengdesign/award