代码
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<style>
.btn {
border: 1px solid #4caf50;
font-size: 14px;
padding: 8px 12px;
color: #4caf50;
outline: none;
}
.btn:active {
background: #eee;
}
input {
padding: 10px 12px;
font-size: 14px;
outline: none;
}
p {
font-size: 22px;
}
</style>
<input type="text">
<button class="btn">
按钮
</button>
<p>1</p>
<script>
var btn = document.querySelector('.btn');
var input = document.querySelector('input');
var p = document.querySelector('p');
var total = 1;
btn.addEventListener('click', function() {
input.value = input.value.split('').reverse().join('');
btn.value = input.value;
p.innerText = input.value;
});
input.addEventListener('keyup', function() {
btn.innerText = input.value;
});
</script>
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