去掉input聚焦时的边框
<html>
<body>
<input placeholder="请输入"/>
</body>
</html>
border:none效果
<html>
<head>
<style>
input{
border:none;
}
</style>
</head>
<body>
<input placeholder="请输入"/>
</body>
</html>
outline: none效果
<html>
<head>
<style>
input{
outline: none;
}
</style>
</head>
<body>
<input placeholder="请输入"/>
</body>
</html>
border:none;加outline:none;效果
<html>
<head>
<style>
input{
border:none;
outline: none;
}
</style>
</head>
<body>
<input placeholder="请输入"/>
</body>
</html>
