原生js实现弹出层效果

2019-11-19 17:51:08

字体：大中小

来源：转载

供稿：网友

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>

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