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基于JavaScript实现随机点名器

2021-03-05 04:07 1166 查看

本文实例为大家分享了JavaScript实现随机点名器的具体代码，供大家参考，具体内容如下

HTML代码：

<body>
<h1>点名啦</h1>
<div id="did">
<input id="rollcall-id" type="button" value="随机点名器"><br>
<input id="action-id" type="submit" onclick="doClick()" value="开始">
</div>
</body>

CSS代码：

<style>
* {
margin: 0px;
padding: 0px;
}

body {
background-color: rgb(255, 249, 249);
}

h1 {
text-align: center;
padding-top: 100px;
color: rgba(250, 54, 129, 0.562);
}

#did {
position: relative;
width: 200px;
margin: 60px auto;
}

#did input:first-child {
width: 200px;
height: 60px;
background-color: rgba(250, 54, 129, 0.562);
/* 不要边框或设边框为透明 */
border: none;
border-radius: 20px;
font-size: 25px;
color: #fff;
box-shadow: 0px 0px 3px 3px rgba(250, 54, 129, 0.158);
/* 点击时边框消失 */
outline: 0;
}

#did input:nth-last-child(1) {
width: 100px;
height: 40px;
margin: 40px 50px;
background-color: rgba(250, 54, 129, 0.562);
border: 1px solid transparent;
background-color: rgba(255, 68, 177, 0.432);
border-radius: 15px;
box-shadow: 0px 0px 2px 2px rgba(250, 54, 129, 0.158);
font-size: 17px;
color: #333;
outline: 0;
transition: color 0.2s ease-out;
transition: box-shadow 0.2s ease-out;
}

#did input:nth-last-child(1):hover {
color: #fff;
cursor: pointer;
box-shadow: 0px 0px 4px 4px rgba(250, 54, 129, 0.158);
}
</style>

JavaScript代码：

<script>
var rollcall = document.getElementById("rollcall-id");
var action = document.getElementById("action-id");
var h1 = document.getElementsByTagName("h1");

//不能用name,用name只会取得一个字符
var allName = ["张柳菲", "高颖影", "赵温言", "李颖", "邓辰希", "莫若邻", "秦橙",
"吴筱宇", "赵希", "马素滢", "吕沁雅", "罗鸿哲", "夏素芸", "谢焱之",
"曹梦朦", "李允书", "周枫桥", "孙浩", "江雁菁", "杨振凯", "林舒言",
"钱妙妙", "郭景", "杜贝贝", "童闵然", "钟小凌", "韩云韵", "白然之"];

//随机产生一个名字
function stringRandom() {
return parseInt(Math.random() * allName.length);
}

var time = null;
var luckName;
//开始
function doStart() {
if (time == null) {
time = setInterval(function () {
//获取随机点名的值
luckName = allName[stringRandom()];
rollcall.setAttribute("value", luckName);
}, 100);
}
}

//停止
function doStop() {
if (time != null) {
clearInterval(time);
time = null;
}
}

//点击事件
function doClick() {
if (action.value == "开始") {
//改变样式
action.style.backgroundColor = "#cecece";
action.style.boxShadow = "0px 0px 2px 2px rgba(100, 100, 100, 0.4)";
action.value = "停止";
h1[0].innerHTML = "点名啦";

//开始随机点名
doStart();
} else if (action.value == "停止") {
action.style.backgroundColor = "rgba(255, 68, 177, 0.432)";
action.style.boxShadow = "0px 0px 2px 2px rgba(250, 54, 129, 0.158)";
action.value = "开始";
h1[0].innerHTML = "恭喜" + luckName + "同学获得一次发言机会";

//停止
doStop();
}
}
</script>

以上就是本文的全部内容，希望对大家的学习有所帮助

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标签： js 点名器

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