<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<input type="text" name="username" id="username" value="" />
<!--<h1></h1>-->
<script type="text/javascript">
var inputUser = document.querySelector('#username')
// var h1 = document.querySelector('h1')
// //输入事件,一般用于检验输入的数据是否符合规范
inputUser.oninput = function(e){
console.log(e)
if(e.target.value == 'admin'){
e.target.style.background = 'skyblue'
}else{
e.target.style.background = 'pink'
}
// h1.innerHTML = e.target.value
}
</script>
</body>
</html>