<!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.notallow=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 >
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