本文实例为大家分享了javascript实现倒计时提示框的具体代码，供大家参考，具体内容如下
代码：
<!DOCTYPE html>
<html lang=\"en\">
<head>
<meta charset=\"UTF-8\">
<meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">
<meta http-equiv=\"X-UA-Compatible\" content=\"ie=edge\">
<title>全屏提示框</title>
<style>
#button{
width: 150px;
height: 50px;
background-color: greenyellow;
}
.fullScreenDiv{/* 全屏div */
display: none;
position: absolute;
left: 0px;
top: 0px;
width: 100%;
height: 100%;
background-color: rgba(0, 0, 0, 0.4);
}
.promptDiv{/* 提示框div */
display: none;
position: absolute;
left: 50%;
top: 50%;
transform: translateX(-50%) translateY(-50%);
width: 30%;
height: 30%;
border-radius: 20px;
background-color:white;
text-align: center;
}
.close{
height: 34px;
line-height: 34px;
margin: 0px;
text-align: right;
border-top-left-radius: 20px;
border-top-right-radius: 20px;
background-color: cornflowerblue
}
.X{
padding: 2px 6px;
margin-right: 8px;
color: white;
cursor: pointer;
}
.countDown{/*倒计时关闭提示框*/
color: red;
font-size: 28px;
}
</style>
<script>
window.onload=function(){
document.getElementById(\"button\").addEventListener(\"click\",function(){
document.getElementsByClassName(\"fullScreenDiv\")[0].style.display=\"block\";
document.getElementsByClassName(\"promptDiv\")[0].style.display=\"block\";
for(var i=5;i>=0;i--){
(function(i){
setTimeout(function(){
var j=Math.abs(i-5);//如果i为0，那么被定时0s，则要输出abs(0-5)=5 ,如果i为5，那么被定时5s，则要输出abs(i-5)=0
if(j==0){
document.getElementsByClassName(\"fullScreenDiv\")[0].style.display=\"none\";
document.getElementsByClassName(\"promptDiv\")[0].style.display=\"none\";
}else{
document.getElementsByClassName(\"countDown\")[0].innerHTML=j;
}
},i*1000);//每次间隔时间为1s
})(i);
}
});
document.getElementsByClassName(\"X\")[0].addEventListener(\"click\",function(){
document.getElementsByClassName(\"fullScreenDiv\")[0].style.display=\"none\";
document.getElementsByClassName(\"promptDiv\")[0].style.display=\"none\";
});
}
</script>
</head>
<body>
<div>
<button id=\"button\">打开全屏提示框</button>
</div>
<div class=\"fullScreenDiv\">
<div class=\"promptDiv\">
<h4 class=\"close\"><span class=\"X\">X</span></h4>
<p>我是全屏提示框我是全屏提示框我是全屏提示框</p>
<p>倒计时关闭</p>
<span class=\"countDown\">5</span>
</div>
</div>
</body>
</html>
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
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