页面展示效果：
脚本展示：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<style type="text/css">
div>div{
width: 50px;
height: 100px;
background-color: blue;
margin: 15px;
}
</style>
<script type="text/javascript">
function myfn(){
var d = document.getElementById("d1");
var input = document.getElementById("i1");
for(var i=0;i<input.value;i++){
d.innerHTML+="<div>aaa</div>";
}
}
</script>
</head>
<body>
<input type="text" id="i1">
<input type="button" value="添加" onclick="myfn()">
<div id="d1"></div>
</body>
</html>