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
demo 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,5b8b4f53;} 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; } 1
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