js 点击获取验证码后的倒数60s

时间：2022-01-14 09:52:39
<!DOCTYPE html>

<html>

	<head>

		<meta charset="UTF-8" />

		<script type="text/javascript">

			window.onload = function() {

				var getCheckNum = document.getElementById("getCheckNum");

				getCheckNum.onclick = function() {

					settime(this)

				}

			}

			var countdown = 60;

			function settime(obj) {

				if(countdown == 0) {

					obj.removeAttribute("disabled");

					obj.value = "免费获取验证码";

					countdown = 60;

					return;

				} else {

					obj.setAttribute("disabled", true);

					obj.value = countdown + "s";

					countdown--;

				}

				setTimeout(function() {

					settime(obj)

				}, 1000)

			}

		</script>

	</head>

	<body>

		<input type="button" class="getCheckNum" id="getCheckNum" value="免费获取验证码" />

	</body>

</html>

　　

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