用select写下拉框，option样式无法更改，那用ul+js写个下拉框功能吧
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<!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>下拉框</title>
</head>
<style type="text/css">
#theme_box {
display: inline-block;
width: 195px;
height: 40px;
background-color: #fff;
cursor:pointer;
top: 0;
left: 0;
}
#content_box {
position: absolute;
top: 0;
left: 220px;
}
.theme_title{
position: relative;
}
.theme_text {
display: block;
width: 173px;
height: 38px;
padding: 0 10px;
line-height: 38px;
border: 1px solid #d8d7d9;
border-radius: 4px;
font-size: 16px;
color: #333;
background: #fff;
}
.theme_text_sele {
display: block;
width: 173px;
height: 38px;
padding: 0 10px;
line-height: 38px;
border: 1px solid #1769fe;
border-radius: 4px;
font-size: 16px;
color: #1968ff;
background: #dce9ff;
}
/* 箭头 */
.triangle_up {
width: 0;
height: 0;
right: 20px;
top: 17px;
position: absolute;
border-left: 8px solid transparent;
border-right: 8px solid transparent;
border-top: 8px solid #323232;
}
.triangle_bom {
width: 0;
height: 0;
right: 20px;
top: 17px;
position: absolute;
border-left: 8px solid transparent;
border-right: 8px solid transparent;
border-bottom: 8px solid #1968ff;
}
#theme_box ul {
list-style: none;
padding: 0px;
margin-top: 4px;
border: 1px solid #333333;
background-color: #fff;
position: relative;
border: 1px solid #d8d7d9;
border-radius: 4px;
z-index: 2;
}
#theme_box ul li{
height: 40px;
line-height: 40px;
font-size: 16px;
color: #333;
padding-left: 10px;
}
#theme_box ul li:hover, #content_box ul li:hover {
color: #156cff;
}
</style>
<body>
<div id="theme_box" onclick="click_ul();">
<div class="theme_title">
<span id="theme_text" class="theme_text">按主题分类</span>
<span id="theme_icon" class="triangle_up"></span>
</div>
<ul id="theme_select">
<li sele="select1" onclick="theme_li_click();">全部</li>
<li sele="select2" onclick="theme_li_click();">产品功能</li>
<li sele="select3" onclick="theme_li_click();">运营培训</li>
<li sele="select4" onclick="theme_li_click();">案例拆解</li>
</ul>
</div>
</body>
<script type="text/javascript">
document.getElementById('theme_select').style.display = 'none';
// 点击展开
function click_ul() {
document.getElementById('theme_select').style.display = 'block';
document.getElementById('theme_text').className='theme_text_sele'
document.getElementById('theme_icon').className='triangle_bom'
}
// 点击下拉选项
function theme_li_click() {
var t_obj = event.target;
console.log(t_obj.getAttribute('sele')); //可获取自定义属性值
document.getElementById('theme_text').innerHTML = t_obj.innerHTML;
setTimeout(function () {
document.getElementById('theme_select').style.display = 'none';
document.getElementById('theme_text').className='theme_text'
document.getElementById('theme_icon').className='triangle_up'
}, 1);
}
// 点其他地方下拉框收回
document.onclick = function () {
var cur_obj = event.target;
if ('theme_text' != cur_obj.id && 'theme_box' != cur_obj.id) {
document.getElementById('theme_select').style.display = 'none';
document.getElementById('theme_text').className='theme_text'
document.getElementById('theme_icon').className='triangle_up'
}
}
</script>
</html>
