(编辑:jimmy 日期: 2024/12/25 浏览:2)
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
<!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>
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。