简单排版
<style>
.box {
display: flex;
align-items: center;
}
#allSelect,
p {
width: 20px;
height: 20px;
margin-top: 5px;
position: relative;
}
li {
list-style: none;
display: flex;
align-items: center;
}
span {
width: 20px;
height: 20px;
border: 1px solid #000;
display: inline-block;
}
.selectk {
position: absolute;
width: 100%;
height: 100%;
background: #000;
top: 0;
left: 0;
}
.selectk::after {
content: "✔";
display: inline-block;
text-align: center;
line-height: 20px;
color: #fff;
}
</style>
</head>
<body>
<div class="box">全选：<div id="allSelect"><span></span></div>
</div>
<ol>
<li><p><span></span></p></li>
<li><p><span></span></p></li>
<li><p><span></span></p></li>
<li><p><span></span></p></li>
<li><p><span></span></p></li>
<li><p><span></span></p></li>
<li><p><span></span></p></li>
</ol>
</body>
功能实现
<script>
var arr = [];
//获取所有的复选按钮
var ospan = document.querySelectorAll("p>span");
//获取页面的全选按钮
var checkBtn = document.querySelector("#allSelect");
//复选按钮点击时
[...ospan].forEach(function(item,index){
item.addEventListener("click",function(){
this.classList.toggle("selectk");
if(this.classList.contains("selectk")){
arr.push(index);
}else{
arr.splice(index,1);
}
if(arr.length === [...ospan].length){
checkBtn.classList.add("selectk")
}else{
checkBtn.classList.remove("selectk")
}
})
})
// 点击全选按钮
checkBtn.addEventListener("click",function(){
this.classList.toggle("selectk");
if(this.classList.contains("selectk")){
[...ospan].forEach(function(item,index){
item.classList.add("selectk")
})
}else{
[...ospan].forEach(function(item,index){
item.classList.remove("selectk")
})
}
})
</script>
效果展示
本人小白，欢迎指正！！