短信倒计时，哪里出问题了不执行，也不报错！
短信倒计时，哪里出问题了不执行，也不报错！
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>短信倒计时</title>
</head>
<body>
<input type="text">
<button id="btn">点击发送短信</button>
<script>
window.onload = function(){
var btn = document.getElementById("btn");
var con = 5;
var _this = this;
var timer = null;
btn.onclick = function(){
clearInterval(timer);
timer = setInterval(sendMessage,1000);
function sendMessage(){
con --;
if(con >= 0){
_this.innerHTML = "还剩余" + con + "秒";
}else{
_this.innerHTML = "重新发送短信";
_this.disabled = false;
clearInterval(timer);
}
}
}
}
</script>
</body>
</html>
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相关分类
JavaScript