完整代码d
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<link rel="stylesheet" href="../static/css/bootstrap.css">
<style>
body,html{
background-color: #70a1ff;
margin: 0;
padding: 0;
width: 100%;
height: 100%;
}
body *{
transition-duration: 500ms;
}
#form-block{
text-align: center;
position: absolute;
top: 50%;
left: 50%;
width: 500px;
height: 200px;
background-color: #f1f2f6;
transform: translateY(-50%) translateX(-50%);
box-shadow: 0 0 10px #000000;
}
#form-form{
width: 70%;
} #form-form > *{
margin: 10px;
}
#email-warning{
display: none;
}
#tips{
padding-top: 6px; ds
z-index: 9999;
position: fixed;
width: 1000px;
}
#form-tips{
background-color: black;
color: #ffffff;
padding: 0 6px;
position: absolute;
}
#triangle{
border:10px solid;
border-color: transparent black transparent transparent;
}
</style>
</head>
<body>
<div id="tips">
<label id="triangle"></label>
<label id="form-tips">这是一个提示</label>
</div>
<div id="form-block">
<h1>注册</h1>
<form id="form-form" class="center-block">
<div>
<input onfocus="showTips('电子邮箱的提示',this)" id="email" class="form-control" placeholder="电子邮箱">
<div id="email-warning" class="label-warning">请输入正确的邮箱地址!</div>
</div>
<div>
<input onfocus="showTips('测试文字', this)" id="vrf" class="form-control" placeholder="验证码">
<div id="vrf-warning" class="label-warning hidden">请输入正确的邮箱地址!</div>
</div>
</form>
</div>
<!-- <button οnclick="changeFormHeight('500')">测试</button>-->
<script>
const TIPS = document.getElementById("tips");
function showTips(msg, obj) {
TIPS.style.display = "block";
var domRect = obj.getBoundingClientRect();
var width = domRect.x+obj.clientWidth;
var height = domRect.y;
TIPS.style.top = height+"px";
TIPS.style.left = width+"px";
document.getElementById("form-tips").innerHTML = msg;
obj.onblur = function () {
TIPS.style.display = "none";
};
window.onresize = function (ev) {
showTips(msg, obj);
}
}
</script>
</body>
