I don't say much nonsense , Code up 

<!DOCTYPE html>

<html lang="en">
<head>

<meta charset="UTF-8">

<title>Document</title>

<meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no">

<style>

html {}
* {

margin: 0;

padding: 0;

list-style: none;

}
.btn.active,

.active:active {

transition-duration: 0s;

background-color: #d9d9d9;

}
.btn {

transition-duration: 3s;

}
li {

height: 50px;

font-size: 30px;

line-height: 50px;

text-align: center;

}
li:hover {

cursor: pointer;

}

</style>

</head>
<body>

<ul>

<li class="btn">123131123131</li>

<li class="btn">li</li>

<li class="btn">li</li>

<li class="btn">li</li>

</ul>

<script>
function fn() {

// stay body There's an incident in Riga 

document.body.addEventListener('mousedown', function(e) {

var target = e.target;

// The class name here btn Add it to the elements you want to achieve the effect 

if (target.className.indexOf('btn') !== -1) {

target.classList.add('active');

}

}, false);

document.body.addEventListener('mouseup', function(e) {

var target = e.target;

if (target.className.indexOf('btn') !== -1) {

target.classList.remove('active');

}

}, false);

}

fn();
</script>

</body>
</html>

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