<!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>
ul {
padding: 0;
list-style: none;
width: 300px;
border: 3px solid black;
}
.red {
background-color: red;
}
.yellow {
background-color: yellow;
}
</style>
</head>
<body>
<ul id="list">
</ul>
<script>
var ary = ['佳佳', '哈哈', '麗麗', '悠悠'];
var str = '';
for (var i = 0; i < ary.length; i++) {
if (i % 2 == 0) {
str += '<li class="red">' + (i + 1) + '.' + ary[i] + '</li>';
} else {
str += '<li class="yellow">' + (i + 1) + '.' + ary[i] + '</li>';
}
}
var oList = document.getElementById('list');
oList.innerHTML = str;
</script>
</body>
</html>
實現效果如下
