倒计时注册

var lefttimes = 10; var intervalId; function CountDown() { var btnagree = document.getElementById("btnagree"); if (btnagree) {//当按钮加载完毕后 if (lefttimes == 0) { btnagree.value = "同意"; btnagree.disabled = false; clearInterval(intervalId); } else { btnagree.value = "请仔细阅读此协议（还有" + lefttimes + "秒）"; lefttimes--; } } } intervalId = setInterval("CountDown()", 1000);

 

页面内容：

<input id="btnagree" type="button" value="同意" disabled="disabled" />  

jquery版：

var lefttime = 10; setInterval(function () { if (lefttime <= 0) { $("#btnagree").attr("disabled", false); $("#btnagree").val("同意"); return; } else { $("#btnagree").attr("disabled", true); $("#btnagree").val("请仔细阅读本协议，还有" + lefttime + "秒"); lefttime--; } },1000); });