对于前端开发者来说，js是不可缺少的语言。现在我开始把我日常积累的一些js效果或者通过搜索自己总结的一些效果分享给大家，希望能够帮助大家一起进步，也希望大家能够多多支持！
1、今天我先分享一个遮罩层弹框效果：
<!DOCTYPE html PUBLIC "-//W3C//DTDXHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
<title>弹出提示</title>
<style>
*{margin:0;padding:0;font-size:12px;}
html,body {height:100%;width:100%;}
#content {background:#FFFFFF;padding:30px;height:100%;}
#content a {font-size:30px;color:#369;font-weight:700;}
#alert {border:1px solid#369;width:300px;height:150px;background:#e2ecf5;z-index:1000;position:absolute;display:none;}
#alert h4 {height:20px;background:#369;color:#fff;padding:5px 0 05px;}
#alert h4 span {float:left;}
#alert h4 span#close{margin-left:210px;font-weight:500;cursor:pointer;}
#alert p {padding:12px 0 0 30px;}
#alert p input {width:120px;margin-left:20px;}
#alert p input.myinp {border:1px solid #ccc;height:16px;}
#alert p input.sub {width:60px;margin-left:30px;}
</style>
</head>
<body>
<div id="content">
<a href="#">注册</a>
</div>
<div id="alert">
<h4><span>现在注册</span><span id="close">关闭</span></h4>
<p><label> 用户名</label><input type="text"class="myinp" onmouseover="this.style.border=‘1px solid#f60‘" onfoucs="this.style.border=‘1px solid #f60‘"onblur="this.style.border=‘1px solid #ccc‘" /></p>
<p><label> 密 码</label><input type="password"class="myinp" onmouseover="this.style.border=‘1px solid#f60‘" onfoucs="this.style.border=‘1px solid #f60‘"onblur="this.style.border=‘1px solid #ccc‘" /></p>
<p><input type="submit" value="注册"class="sub" /><input type="reset" value="重置"class="sub" /></p>
</div>
<script type="text/javascript">
var myAlert = document.getElementById("alert");
var reg = document.getElementById("content").getElementsByTagName("a")[0];
var mClose = document.getElementById("close");
reg.onclick = function()
{
myAlert.style.display = "block";
myAlert.style.position = "absolute";
myAlert.style.top = "50%";
myAlert.style.left = "50%";
myAlert.style.marginTop = "-75px";
myAlert.style.marginLeft = "-150px";
mybg = document.createElement("div");
mybg.setAttribute("id","mybg");
mybg.style.background = "#000";
mybg.style.width = "100%";
mybg.style.height = "100%";
mybg.style.position = "absolute";
mybg.style.top = "0";
mybg.style.left = "0";
mybg.style.zIndex = "500";
mybg.style.opacity = "0.3";
mybg.style.filter = "Alpha(opacity=30)";
document.body.appendChild(mybg);
document.body.style.overflow = "hidden";
}
mClose.onclick = function()
{
myAlert.style.display = "none";
mybg.style.display = "none";
}
</script>
</body>
</html>