原生js实现随机点名功能
时间：2021-01-22 12:27:32|栏目：JavaScript代码|点击： 次
本文实例为大家分享了js实现随机点名的具体代码，供大家参考，具体内容如下
原生js实现随机点名，js部分有注释
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
*{
padding: 0;
margin: 0;
}
.wrapper{
width: 800px;
margin: 10px auto;
border: 2px solid #ccc;
text-align: center;
}
.lucking{
width: 200px;
height: 180px;
border: 1px solid #000;
position: relative;
}
.lucking img{
position: absolute;
left: 0;
bottom: 0;
}
.wrapper ul li{
width: 100px;
height: 50px;
line-height: 50px;
text-align: center;
margin: 4px;
border:2px solid #ccc;
border-radius: 5px;
/* 不设置float:left的原因
1： 浮动不能让父盒子撑开高度
2： display:inline-block 具有行内元素的属性特征，给父盒子加text-align:center 可使其居中
*/
display: inline-block;
}
.wrapper button{
margin-top: 20px;
width: 80px;
height: 40px;
border: none;
background-color: #ddd;
border-radius: 5px;
font-weight: 700;
outline: none;
cursor: pointer;
}
.wrapper .active{
background-color: #f1084a;
font-weight: 700;
}
</style>
</head>
<body>
<div class="wrapper" id="_wrapper">
<ul id="_ul"></ul>
<button class="start">开始点名</button>
<button class="stop">停止</button>
<div class="lucking" id="_lucking">
<p></p>
<img src="1.gif" alt="">
</div>
</div>
</body>
</html>
<script>
var array = ['杨雨婷','张蓓','王洁','邓伦','李易峰','杨雨婷','张蓓','王洁','邓伦','李易峰','杨雨婷','张蓓','王洁','邓伦','李易峰','杨雨婷','张蓓','王洁','邓伦','李易峰','杨雨婷','张蓓','王洁','邓伦','李易峰','杨雨婷','张蓓','王洁','邓伦','李易峰','杨雨婷','张蓓','王洁','邓伦'];
// 获取元素
var _wrapper = document.getElementById('_wrapper');
var ul = document.getElementById('_ul');;
var timer = null;
init();
function init(){
// 动态创建li
for(var i = 0; i < array.length;i++)
{
var oli = document.createElement('li');
oli.innerHTML = array[i];
ul.appendChild(oli);
}
// 点击
click();
}
function click(){
// 获取start按钮
var start = _wrapper.getElementsByTagName('button')[0];
var stop = _wrapper.getElementsByTagName('button')[1];
var lucking = document.getElementById('_lucking');
// 定时器
start.addEventListener('click',function(){
clearInterval(timer);
timer = setInterval(function(){
// 获得随机数
var random = Math.floor(Math.random()*array.length);
for(var i = 0;i < array.length;i++)
{
ul.children[i].className = '';
}
ul.children[random].className = 'active';
},50);
});
stop.addEventListener('click',function(){
clearInterval(timer);
// 找到此时的元素
var active = document.getElementsByClassName('active')[0];
lucking.children[0].innerText = "幸运儿：" + active.innerText;
})
}
</script>
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