<body>
<input type="">
<button>发送</button>
<script>
var btn = document.querySelector('button');
var time = 3;
btn.addEventListener('click',function() {
btn.disabled = true;
var timer = setInterval(function() {
if (time == 0) {
btn.disabled = false;
btn.innerHTML = '发送';
}else {
btn.disabled = true;
btn.innerHTML = '还需要'+time+'秒发送';
time--;
}
},1000);
})
</script>
</body>```
