Claim:
发送After clicking , the button is disabled and a countdown appears. Set to 5 seconds countdown.
After 5 seconds, the button is restored and can be clicked again 发送.
Realization ideas:
- After the button is clicked, disable it
disabledastrue - At the same time, the content inside the button will change,
buttonand the content inside will beinnerHTMLmodified - The number of seconds inside changes, so you need to use a timer
- Define a variable, in the timer, keep decreasing
- If the variable is 0, it means the time is up, you need to stop the timer, restore the variable, and restore the initial state of the button
Code:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
手机号码： <input type="text"> <button>发送</button>
<script>
// 按钮点击之后，会禁用 disabled 为true
// 同时按钮里面的内容会变化， 注意 button 里面的内容通过 innerHTML修改
// 里面秒数是有变化的，因此需要用到定时器
// 定义一个变量，在定时器里面，不断递减
// 如果变量为0 说明到了时间，我们需要停止定时器，并且复原按钮初始状态
var btn = document.querySelector('button');
var time = 5; // 定义剩下的秒数
btn.addEventListener('click', function() {
btn.disabled = true;
var timer = setInterval(function() {
if (time == 0) {
// 清除定时器和复原按钮
clearInterval(timer);
btn.disabled = false;
btn.innerHTML = '发送';
time = 5; // 重新赋值时间变量
} else {
btn.innerHTML = time + '秒后可再次发送';
time--;
}
}, 1000);
});
</script>
</body>
</html>