一、div與span
(1)區塊級標籤:div(2)內嵌標籤:span如圖所示:
註:可用瀏覽器的調試工具可查看盒子
(1)margin:盒子外邊距
(2)padding:
(3)border:盒子邊框寬度(4)width:盒子寬度
(5)height:盒子高度例子:①:外邊距和內邊邊距區別:
<!doctype html> <html> <head> <title>Div+Css布局(div+span以及盒模型)</title> <meta charset="utf-8"> <style type="text/css"> body{ margin:0; padding:0; background:#C5C1AA; } div{ height:500px; margin:60px; padding:o; border:solid 2px black; background-color:rgba(255,0,0,0.7); } div.div1{ height:400px; margin:0 audio; border:solid 3px black; background-color:rgba(0,0,255,0.7); } </style> </head> <body> <div> <div class="div1"> <h1 style="text-align:center;">欢迎登录系统</h1> <h4 style="text-align:center;">账号:<input style="text"></h4> <h4 style="text-align:center;">密码:<input style="text"></h4> </div> </div> </body> </html>
<!doctype html> <html> <head> <title>Div+Css布局(div+span以及盒模型)</title> <meta charset="utf-8"> <style type="text/css"> body{ margin:0; padding:0; background-color:rgba(0,0,255,0.3); } div{ width:500px; height:500px; background-color:rgba(250,128,10,0.8); margin:0 auto; /* 使div居中*/ border:solid black; } div.div1{ float:left; /* 向左排列/* background-color:rgba(255,0,0,0.4); border:solid blue; height:244px; width:244px; margin:0; padding:0; } </style> </head> <body> <div> <div class="div1"></div> <div class="div1"></div> </div> </body> </html>
(1)position.父元素進行定位:absolute③.根據瀏覽器視窗進行定位: fixed④.沒有定位:static⑤.繼承:inherit(2)定位①.left:XXpx(左)離頁頂點的距離②.right:XXpx(右)離頁面頂點的距離③.top:XXpx(上)離頁面頂點的距離④.bottom:XXpx(下)離頁面頂點的距離(3)z-index 層覆蓋先後順序(優先權)①.-1,0 ,1,2,3;當為-1時,該圖層為最底層
①.display:none 層不顯示
② .display:block 塊狀顯示,在元素後面換行,顯示下一個塊元素③.display:inline 內聯顯示,多個塊可以顯示在一行內
(5)float 浮動屬性①.left:左浮動
②.right:右浮動
[b](6)clear 清除浮動[/b]
①.clear:both
[b](7)overflow 溢出處理[/b]
①.層大小的內容
②.scroll無論內容是否超出層大小都添加滾動條
③.auto 超出時自動添加滾動條
[b]範例:[/b]
①:固定位置與demo
<!doctype html> <html> <head> <title>Div+Css布局(布局相关的属性)</title> <meta charset="utf-8"> <style type="text/css"> body{ padding:0; margin:0; } div.diva{ position:relative; /* 一定要添加,如没添加其子元素则不生效*/ margin:50px; width:500px; height:500px; background-color:rgba(255,0,0,0.4); } .spanb{ position:absolute; background-color:blue; color:black; top:-10px; right:0; } .fixed{ padding:20px; background:green; position:fixed; left:0; top:40px; z-index:1; /* z-index的value值可为-1,0,1,2;当为-1时,该图层为最底层 */ } </style> </head> <body> <div class="fixed"> <p>联系人:翁孟铠</p> <p>联系电话:XXXxxxx</p> <p>地址:XXXXXXXXXXX</p> </div> <div class="diva"> <span class="spanb">浏览次数:222</spn> </div> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> </body> </html>
<!doctype html> <html> <head> <title>Div+Css布局(浮动以及溢出处理)</title> <meta charset="utf-8"> <style type="text/css"> body{ padding:0; margin:0; } .div{ width:auto; height:auto; background:#f1f1f1; margin:0 auto; color: black; } .left{ width: 300px; height: 400px; position: inherit; top: 60px; background:yellow; float: left; color: black; } .right{ float: left; width: 1049px; height: 400px; position: inherit; top: 60px; background:lavenderblush; color: black; } .top{ width: auto; height: 60px; background: royalblue; position: inherit; top:0; } .bottom{ clear: both; margin-top:20px; width: 960px; height: 20px; background: red; } .jianjie{ height: 80px; width: 200px; background: brown; overflow: auto; } </style> </head> <body> <div class="div"> <div class="top">logo</div> <div class="left">左边</div> <div class="right"> 简介:<br> <div class="jianjie"> 1、这是简介<br> 2、我们在做溢出测试<br> 3、hidden 隐藏超出层大小的内容<br> 4、scroll无论内容是否超出层大小都添加滚动条<br> 5、auto 超出时自动添加滚动条 </div> </div> <div class="bottom"></div> </div> </body> </html>