简单点，就是直接上代码~
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>点名1</title>
<style>
body {
background-color: aliceblue;
}
.box {
width: 1000px;
height: 240px;
margin: 0 auto;
margin-top: 100px;
clear: both;
}
#btn {
width: 100px;
height: 30px;
margin-left: 600px;
margin-top: 50px;
}
#span {
float: right;
position: relative;
top: 55px;
right: 185px;
}
h1 {
text-align: center;
}
.isName {
width: 110px;
height: 30px;
float: left;
background-color: antiquewhite;
margin-left: 10px;
margin-top: 10px;
text-align: center;
/* line-height: 30; */
padding-top: 10px;
}
</style>
</head>
<body>
<h1>随机点名</h1>
<span id="span1"></span>
<div class="box" id="box"></div>
<input type="button" id="btn" value="点名" />
<span id="span2"></span>
<script>
function idName(id) {
return document.getElementById(id);
};
var arr = ["1", "2", "3", "4", "5", "6", "7", "8",
"9", "10", "11", "12", "13", "14", "15", "16",
"17", "18", "19", "20", "21", "22", "23", "24", "25"
];
var nums = arr.length;
for (var i = 0; i < nums; i++) {
var div = document.createElement("div");
div.className = "isName";
div.innerHTML = arr[i];
idName("box").appendChild(div);
};
var index;
idName("btn").onclick = function () {
if (this.value == "点名") {
timer = setInterval(function () {
for (var i = 0; i < nums; i++) {
idName("box").children[i].style.background = "";
};
var index1 = parseInt(Math.random() * nums);
idName("box").children[index1].style.background = "red";
index = index1;
}, 10);
this.value = "暂停";
} else {
clearInterval(timer);
this.value = "点名";
};
};
</script>
</body>
</html>就还比较实用，记下来哈哈~