javascript倒计时提示框

<!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>
javascript倒计时提示框

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