<!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>Document</title>
<style id="style-app">
</style>
</head>
<body>
<div id="content">
<div id="style-text">
</div>
<div id="tooltips" style="display:none">
<div id="info">
<div class="title">信息</div>
<div class="content">恭喜你，中奖了</div>
<div class="btn">
<button id="confirm">确定</button>
</div>
</div>
</div>
</div>
<script type="text/javascript">
//es6中定义一个很长的字符串 `
var style_text = `
#style-text{
width: 300px;
height: 460px;
border: 5px solid white;
background-color: green;
color: white;
}
#tooltips{
width: 100%;
height: 100%;
background-color: rgba(0,0,0,0.5);
position: absolute;
top: 0;
z-index: 999;
display: block!important;
}
#info{
width: 400px;
height: 200px;
background-color: white;
margin: 150px auto;
}
#info .title{
width: 100%;
height: 40px;
background-color: #009f95;
line-height: 40px;
color: white;
padding-left: 20px;
box-sizing: border-box;
}
#info .btn button{
background-color: #009f95;
color: white;
outline: none;
font-size: 10px;
width:60px;
height: 30px;
margin-left: 300px;
}
#info .content {
height: 120px;
padding: 20px;
box-sizing: border-box;
}
`
var style_app = document.getElementById("style-app")
var style_text_obj = document.getElementById("style-text")
//表示结束的位置
var n = 1
var timer = setInterval(function(){
//substring字符串截取，第一个参数开始位置，第二个参数结束位置
style_app.innerHTML = style_text.substring(0,n)
style_text_obj.innerHTML = style_text.substring(0,n)
n++
if(n === style_text.length){
clearInterval(timer)
alert("代码书写完成！")
}
}, 10)
</script>
</body>
</html>
