Demo 演示地址：http://janycode.github.io/random/index.html
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| <!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body onload="getFood()">
世界难题"中午吃什么？"解决方案：<br><br>
<center>
<span id="food"></span>
<hr style="width: 450px;" />
<input type="button" id="button" style="font-size: 30px;" value="开始" onclick="run()" />
</center>
</body>
<script type="text/javascript">
function getFood() {
var arr = ['盖浇饭', '油泼面', '焖面', '凉皮', '兰州拉面', '炒面', '热干面'];
var index = Math.floor(Math.random() * arr.length);
var code = arr[index];
var spanNode = document.getElementById("food");
spanNode.innerText = code;
spanNode.style.fontSize = "99px";
spanNode.style.color = "red";
spanNode.style.backgroundColor = "lightyellow";
spanNode.style.fontFamily = "楷体";
}
var id;
var cnt = 0;
function run() {
cnt++;
if (cnt % 2 == 0) {
document.getElementById("button").value = "开始";
clearInterval(id);
} else {
document.getElementById("button").value = "暂停";
id = setInterval("getFood()", 50);
}
}
</script>
</html>
|