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服务器之家。
原文链接：https://blog.csdn.net/CWH0908/article/details/89736836
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