（拯救选择困难症）随机选择今天中午吃啥
不知道今天中午改吃啥
HTML（拯救选择困难症）
效果图：
源代码：
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>随机点餐</title>
</head>
<style>
#box{background-color:#CCC;width:400px;font:600 24px/3 "";text-align:center;margin:20px auto ;border-radius:12px;}
#btn{background-color:#CFF;width:100px;font:14px/2 "";text-align:center;margin:10px 46% ;border-radius:25px;}
</style>
<body>
<div id="box">今天中午想点啥</div>
<input type="button" id="btn" value="开始">
</body>
<script>
var arr = ["椰子鸡","牛肉饭","汤饭","大碗饭", "饺子","糖醋排骨","红烧肉"];
var box = document.getElementById("box")
var btn = document.getElementById("btn")
var i=0;
var t;
btn.onclick = function(){
if(i==0){
t = setInterval(function(){
box.innerHTML = arr[random(0,arr.length-1)];
}, 30);
i = 1;
btn.value = "停止"
}else{
clearInterval(t);
i = 0;
btn.value = "继续";
}
}
function random(a,b){
return Math.round(Math.random()*(a-b)+b);
}
</script>
</html>