本文实例为大家分享了js实现简单随机点名器的具体代码,供大家参考,具体内容如下
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<!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 >
.box {
width: 200px;
height: 200px;
line-height: 200px;
background-color: #ccc;
font-size: 30px;
text-align: center;
}
</ style >
</ head >
< body >
< div class = "box" >此乃点名器</ div >
< input type = "button" value = "点名" id = "btn" >
<!-- <button id="btn">点名</button> -->
< script >
var btn = document.getElementById("btn");
var box = document.getElementsByClassName("box")[0];
// 3、写一个随机抽名的案例?(点击按钮开启定时器,
// 定时器中去随机抽取人名,把全班的人放在一个数组中,只要想办法获取随机的索引号就可以)
btn.onclick = function() {
if(this.value==="点名") {
function fn() {
var arr = ["张三","李四","王五","赵六","黑七","白八","紫九","红薯"];
var index = parseInt(Math.random()*arr.length);
var n1 = parseInt(Math.random()*255+1);
var n2 = parseInt(Math.random()*255+1);
var n3 = parseInt(Math.random()*255+1);
box.style.background ="rgb("+n1+","+n2+","+n3+")" ;
box.innerHTML = arr[index];
}
this.value = "停止";
//定时器不加var声明,涉及到作用域问题
timer=setInterval(fn,2);
}else {
clearInterval(timer);
this.value = "点名";
}
}
</ script >
</ body >
</ html >
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效果图如下:
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/weixin_42190893/article/details/102930113