之前 ui的设计稿选择框不想要默认样式，默认样式改起来也是太心塞，有的还改不了，所以干脆自己写了一个p模拟的选择框 先看效果吧：
代码实现不多，也都很简单，js部分是纯原声的所以不需要引用其他框架就可以用：
先HTML部分：
<!DOCTYPE html><html> <head> <meta charset="UTF-8"> <title>p模拟select选择框</title> <meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" /> <link href="css/customSelect.css" rel="stylesheet" /> </head> <body> <p class="custom-select-box"> <p class="select-box mui-inline" style="width: 220px;"> <span id="fisrt" data-show="0">1</span> <ul class="custom-option-box"> <li class="active"><span>1</span></li> <li><span>2</span></li> <li><span>3</span></li> <li><span>4</span></li> </ul> </p> </p> <script src="js/customSelect.js"></script> </body></html>
css部分：
ul,li,p,span{
box-sizing: border-box;
}.select-box ul,
.select-box li {
list-style-type: none;
margin: 0;
padding: 0;
cursor: pointer;
background: #fff;
}.select-box {
width: 100%;
position: relative;
background: #fff;
}#fisrt {
display: block;
line-height: 40px;
width: 100%;
height: 40px;
padding: 0 15px;
padding-right: 20px;
border: 1px solid #ccc;
border-radius: 3px; /*white-space: nowrap;*/
overflow: hidden;
cursor: pointer;
}#fisrt.active {
border: 1px solid #F2C051;
}#fisrt::after {
content: "";
display: block;
position: absolute;
top: 18px;
right: 10px;
width: 0;
height: 0;
border: 5px solid transparent;
border-top-color: #000;
background: #fff;
}.custom-option-box {
display: none;
position: absolute;
left: 0;
top: 40px;
background: #fff;
border: 1px solid #ccc;
border-top-color: transparent;
z-index: 10000;
}.custom-option-box li {
display: block;
line-height: 30px;
padding: 0 15px;
z-index: 10000;
}.custom-option-box li:hover,
.custom-option-box li.active {
background: #F2C051;
}.custom-option-box span {
cursor: pointer;
}js部分：（js部分有一点粗糙，现放上来，这两天会修改一下）
(function() {
ready(function() {
var option_box = document.getElementsByClassName("custom-option-box")[0],
select_box = document.getElementsByClassName("select-box")[0],
width;
option_box.style.display = "none"; //初始ul隐藏
width = select_box.offsetWidth; //select的宽度 默认 100%
option_box.style.width = width + "px"; //初始ul宽度
document.getElementById("fisrt").addEventListener("click", function() {
var isShow = this.dataset.show;
if(isShow == 0) {
this.dataset.show = 1;
this.classList.add("active");
this.nextElementSibling.style.display = "block"; //找到ul.son_ul显示
} else {
this.dataset.show = 0;
this.classList.remove("active");
this.nextElementSibling.style.display = "none"; //找到ul.son_ul显示
}
},false);
var option = option_box.getElementsByTagName("li");
for(var i = 0; i < option.length; i++){
option[i].onclick = function(){
var fisrt = this.parentNode.previousElementSibling;
var siblings = getSiblings(this);
fisrt.innerHTML = this.childNodes[0].innerText;
fisrt.dataset.val = this.dataset.val;
this.classList.add("active");
for(var i = 0;i<siblings.length;i++){
siblings[i].classList.remove("active");
} this.parentNode.style.display = "none";
fisrt.dataset.show = 0;
fisrt.classList.remove("active");
}
}
});
function ready (fn) {
if(document.addEventListener){ //标准浏览器
document.addEventListener('DOMContentLoaded',function(){ //注销时间，避免重复触发
document.removeEventListener('DOMContentLoaded',arguments.callee,false);
fn();
//运行函数
},false);
}else if(document.attachEvent){ //IE浏览器
document.attachEvent('onreadystatechange',function(){
if(document.readyState=='complete'){
document.detachEvent('onreadystatechange',arguments.callee);
fn();
//函数运行
}
});
}
}
function getSiblings (elm) {
var a = [];
var p = elm.parentNode.children;
for(var i = 0, pl = p.length; i < pl; i++) {
if(p[i] !== elm) a.push(p[i]);
}
return a;
}
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