知识要点
1. 遮罩层的宽度和高度是 js 获取页面的宽高(页面内容)
- //获取遮罩层(内容)的高度和宽度
- var sHeight=document.documentElement.scrollHeight;
- var sWidth=document.documentElement.scrollWidth;
2. 登录框设置静止定位 fixed
3. 登录框居中显示公式:(可视区域宽高 - 登录框宽高)/2
- //获取login的宽度和高度并设置偏移值
- var dHeight=oLogin.offsetHeight;
- var dWidth=oLogin.offsetWidth;
- oLogin.style.left=(sWidth-dWidth)/2+"px";
- oLogin.style.top=(wHeight-dHeight)/2+"px";
完整代码
- <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 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>demo</title>
- <style>
- body,h1,h2,h3,h4,h5,h6,hr,p,blockquote,dl,dt,dd,ul,ol,li,pre,form,fieldset,legend,button,input,textarea,th,td{margin:0;padding:0;}
- body,button,input,select,textarea{font:12px/1.5 tahoma,arial,\5b8b\4f53;}
- h1,h2,h3,h4,h5,h6{font-size:100%;}
- address,cite,dfn,em,var{font-style:normal;}
- code,kbd,pre,samp{font-family:courier new,courier,monospace;}
- small{font-size:12px;}
- ul,ol{list-style:none;}
- a{text-decoration:none;}
- a:hover{text-decoration:underline;}
- sup{vertical-align:text-top;}
- sub{vertical-align:text-bottom;}
- legend{color:#000;}
- fieldset,img{border:0;}
- button,input,select,textarea{font-size:100%;}
- table{border-collapse:collapse;border-spacing:0;}
- .clear{clear: both;float: none;height: 0;overflow: hidden;}
- p{font-size: 100px;}
- #mask{
- background: #000;
- opacity: 0.75;
- filter: alpha(opacity=75);
- height: 1000px;
- width: 100%;
- position: absolute;
- left: 0;
- top: 0;
- z-index: 1000;
- }
- #login{
- position: fixed;
- left: 30%;
- top: 30%;
- z-index:1001;
- }
- .loginCon{
- width: 670px;
- height: 380px;
- background: #fff;
- border:5px solid #F01400;
- }
- #close{
- width: 30px;
- height: 30px;
- background: blue;
- cursor: pointer;
- position: absolute;
- right: 10px;
- top: 10px;
- }
- #btnLogin{
- width: 80px;
- height: 40px;
- background: #F01400;
- margin:0 auto;
- display: block;
- cursor: pointer;
- border-style: none;
- color: #fff;
- font-size: 16px;
- }
- </style>
- </head>
- <body>
- <button id="btnLogin">登录</button>
- <!--
- <div id="mask"></div>
- <div id="login">
- <div class="loginCon">
- <div id="close"></div>
- </div>
- </div>
- -->
- <p>1</p>
- <p>1</p>
- <p>1</p>
- <p>1</p>
- <p>1</p>
- <p>1</p>
- <p>1</p>
- <p>1</p>
- <p>1</p>
- <p>1</p>
- <script type="text/javascript">
- function openNew(){
- //获取页面body!内容!的高度和宽度
- var sHeight=document.documentElement.scrollHeight;
- var sWidth=document.documentElement.scrollWidth;
- //获取可视区域高度,宽度与页面内容的宽度一样
- var wHeight=document.documentElement.clientHeight;
- //创建遮罩层div并插入body
- var oMask=document.createElement("div");
- oMask.id="mask";
- oMask.style.height=sHeight+"px";
- //宽度直接用100%在样式里
- document.body.appendChild(oMask);
- //创建登录层div并插入body
- var oLogin=document.createElement("div");
- oLogin.id="login";
- oLogin.innerHTML="<div class='loginCon'><div id='close'></div></div>"
- document.body.appendChild(oLogin);
- //获取login的宽度和高度并设置偏移值
- var dHeight=oLogin.offsetHeight;
- var dWidth=oLogin.offsetWidth;
- oLogin.style.left=(sWidth-dWidth)/2+"px";
- oLogin.style.top=(wHeight-dHeight)/2+"px";
- //获取关闭按钮
- var oClose=document.getElementById("close");
- oMask.onclick=oClose.onclick=function(){
- document.body.removeChild(oMask);
- document.body.removeChild(oLogin);
- }
- }
- window.onload=function(){
- var oBtn=document.getElementById("btnLogin");
- oBtn.onclick=function(){
- openNew();
- }
- }
- </script>
- </body>
- </html>
以上就是本文的全部内容,希望本文的内容对大家的学习或者工作能带来一定的帮助,同时也希望多多支持脚本之家!
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