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PHP+JavaScript implements refresh button to continue countdown
PHP+JavaScript implements refresh button to continue countdown
场景：发送一个验证码到手机，当验证码发出时，会提示隔 1 分钟之后可以再次发送。通常有这几种方式防止恶意请求，一是再次发送之前需要输入验证码，二是在指定的时间间隔之内不能再次发送。
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有些网站在 1 分钟的间隔之间之内发送按钮的确是禁用了，但是只要刷新浏览器，或者通过 F12 工具修改 Button 的 disabled 属性，在时间间隔之内仍然可以点击按钮。
需要在刷新的情况下仍然保持倒计时，可以在服务器端用过 SESSION 记录点击的时间，并且每次加载页面的时候都去检测当前时间和点击时间的时间差。
测试框架使用 ThinkPHP 3.2.3
视图文件位于：/Application/Home/View/Mail/index.html
控制器位于：/Application/Home/Controller/MailController.class.php
index.html:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<script src="http://lib.sinaapp.com/js/jquery/1.9.1/jquery-1.9.1.min.js"></script>
</head>
<body>
<input type="button" value="发送验证码" id="send">
</body>
<script>
$i = 30; // 倒计时的秒数
// 检测剩余时间
$(function(){
$.ajax({
url: "{:U('Home/Mail/send_time', '', '')}",
method: 'post',
data: {
'seconds': $i
},
success: function(data) {
console.log(data);
if(data > 0) {
interval(data);
}
}
});
});
// 发送点击时间
$("#send").click(function(){
$.ajax({
url: "{:U('Home/Mail/record_time', '', '')}",
method: 'post',
data: {
'seconds': $i,
'click_time': parseInt(new Date().getTime()/1000)
},
success: function(data) {
if(data != 0) { // 防止通过 F12 修改 button 的 disabled 属性在间隔时间之内再次点击按钮
interval($i);
}
console.log(data);
}
});
});
// 显示提示文字，禁用提交按钮
function setTime($t) {
$button = $("#send");
$message = $("<span id='message'> <span id='wait'>"+ $t +"</span>秒后可重新发送验证码...</span>");
$message.insertAfter($button);
$button.attr("disabled", true);
}
// 倒计时
function interval($t) {
setTime($t);
var wait = document.getElementById('wait');
var interval = setInterval(function(){
var time = --wait.innerHTML;
if(time <= 0) {
clearInterval(interval);
$button.attr("disabled", false);
$message.remove();
};
}, 1000);
}
</script>
</html>MailController.class.php:
<?php
namespace Home\\\\Controller;
use Think\\\\Controller;
class MailController extends Controller {
public function index() {
$this->display();
}
// 记录时间戳
public function record_time() {
session_start();
if(IS_AJAX) {
$click_time = $_POST['click_time'];
if(isset($_SESSION['click_time']) && $click_time - $_SESSION['click_time'] < $_POST['seconds']) {
echo 0; // 防止通过 F12 修改 button 的 disabled 属性在间隔时间之内再次点击按钮
} else {
$_SESSION['click_time'] = $click_time;
echo date('Y-m-d H:i:s', $click_time);
}
}
}
// 发送时间戳
public function send_time() {
session_start();
$time_diff = time() - $_SESSION['click_time'];
if(isset($_SESSION['click_time']) && $time_diff < 30) {
$diff = $_POST['seconds'] - $time_diff;
if($diff > 0) {
echo $_POST['seconds'] - $time_diff;
} else {
echo 0;
}
} else {
unset($_SESSION['click_time']);
}
}
}实现效果图
初始状态：
点击按钮：
console 中显示的时间戳是点击按钮时的时间戳，通过 AJAX 发送到服务器端并且记录在 SESSION 中
倒计时结束之前刷新页面：
console 控制台显示的 12 表示距离倒计时结束还有 12 秒，通过加载页面时的 AJAX 请求服务器，比较当前时间和 SESSION 中记录的点击时间（如果有）并且两者相差的时间小于倒计时的时间，则返回剩余的时间，客户端接受到时间后仍然保持按钮禁用，同时从返回的时间开始倒计时。
倒计时结束：
按钮恢复可用。
在倒计时间隔时间内通过 F12 删除 button 的 disabled 属性，虽然按钮可以点击，但是由于返回值是 0，因此不会触发新的动作以及重新计时：
删除属性之前：
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