随机抽奖
<p>张三</p>
<button>点击停止</button>
var arr = ['张三','李四','老王','王五','周公'];
var pTxt = document.getElementsByTagName('p')[0];
var btn = document.getElementsByTagName('button')[0];
var time;
time = setInterval(radom,20)
function radom() {
//当前arr数组的下标的随机数
var index = parseInt(Math.random()*arr.length);
pTxt.innerHTML = arr[index];
}
btn.onclick = function () {
clearInterval(time);
}
效果图
