<style>
#myInput {
background-image: url('https://static.runoob.com/images/mix/searchicon.png'); /* 搜索按钮 */
background-position: 10px 12px; /* 定位搜索按钮 */
background-repeat: no-repeat; /* 不重复图片*/
width: 100%;
font-size: 16px; /* 加大字体 */
padding: 12px 20px 12px 40px;
border: 1px solid #ddd;
margin-bottom: 12px;
}
#myUL {
/* 移除默认的列表样式 */
list-style-type: none;
padding: 0;
margin: 0;
}
#myUL li a {
border: 1px solid #ddd; /* 链接添加边框 */
margin-top: -1px;
background-color: #f6f6f6;
padding: 12px;
text-decoration: none;
font-size: 18px;
color: black;
display: block;
}
#myUL li a.header {
background-color: #e2e2e2;
cursor: default;
}
#myUL li a:hover:not(.header) {
background-color: #eee;
}
</style>
<input type="text" id="myInput" onkeyup="myFunction()" placeholder="搜索...">
<ul id="myUL">
<li><a href="#" class="header">A</a></li>
<li><a href="#">Adele</a></li>
<li><a href="#">Agnes</a></li>
<li><a href="#" class="header">B</a></li>
<li><a href="#">Billy</a></li>
<li><a href="#">Bob</a></li>
<li><a href="#" class="header">C</a></li>
<li><a href="#">Calvin</a></li>
<li><a href="#">Christina</a></li>
<li><a href="#">Cindy</a></li>
</ul>
<script>
function myFunction() {
// 声明变量
var input, filter, ul, li, a, i;
input = document.getElementById('myInput');
filter = input.value.toUpperCase();
ul = document.getElementById("myUL");
li = ul.getElementsByTagName('li');
// 循环所有列表，查找匹配项
for (i = 0; i < li.length; i++) {
a = li[i].getElementsByTagName("a")[0];
if (a.innerHTML.toUpperCase().indexOf(filter) > -1) {
li[i].style.display = "";
} else {
li[i].style.display = "none";
}
}
}
</script>