相对定位：
1 <!DOCTYPE html> 2 <html lang="en"> 3 <head> 4 <meta charset="UTF-8"> 5 <title>Document</title> 6 <style class="text/css"> 7 .box{ 8 width: 600px; 9 height: 600px; 10 border: 1px solid black; 11 } 12 .box .red{ 13 width: 100px; 14 height: 100px; 15 background: red; 16 } 17 .box .green{ 18 width: 100px; 19 height: 100px; 20 background:#00ff00; 21 position: relative;/*相对定位：相对原来的自己的位置偏移*/ 22 right: -100px; 23 24 } 25 .box .blue{ 26 width: 100px; 27 height: 100px; 28 background: blue; 29 } 30 </style> 31 </head> 32 <body> 33 <div class="box"> 34 <div class="red"></div> 35 <div class="green"></div> 36 <div class="blue"></div> 37 </div> 38 </body> 39 </html>
绝对定位：
1 <!DOCTYPE html> 2 <html lang="en"> 3 <head> 4 <meta charset="UTF-8"> 5 <title>Document</title> 6 <style class="text/css"> 7 .box{ 8 width: 600px; 9 height: 600px; 10 border: 1px solid black; 11 margin: 50px auto; 12 position: relative; 13 } 14 .box .red{ 15 width: 100px; 16 height: 100px; 17 background: red; 18 } 19 .box .green{ 20 width: 100px; 21 height: 100px; 22 background:#00ff00; 23 position: absolute;/*绝对定位：相对于祖先定位元素进行位置偏移*/ 24 right: -20px; 25 top: -20px; 26 27 } 28 .box .blue{ 29 width: 100px; 30 height: 100px; 31 background: blue; 32 } 33 </style> 34 </head> 35 <body> 36 <div class="box"> 37 <div class="red"></div> 38 <div class="green"></div> 39 <div class="blue"></div> 40 </div> 41 </body> 42 </html>
