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margin赋值为负值的实例介绍

零下一度
零下一度asal
2017-06-28 09:44:581696semak imbas

1、margin-top为负值像素

margin-top为负值像素,偏移值相对于自身,其后元素受影响,见如下代码:

 1 <!DOCTYPE html> 2 <html lang="zh"> 3 <head> 4     <meta charset="UTF-8" /> 5     <meta http-equiv="X-UA-Compatible" content="ie=edge" /> 6     <title>margin不同赋值情况(负值,百分数)</title> 7     <style type="text/css"> 8         *{ 9             margin: 0;10             padding: 0;11         }12         /*父元素样式*/13         .p{14             margin: 100px;15             width: 500px;16             height: 500px;17             border: 1px solid red;18         }19         .c1{20             width: 200px;21             height: 200px;22             border: 1px solid blue;23             /*margin-top为负值像素,偏移值相对于自身,其后元素受影响*/24             margin-top: -20px;25         }26         .c2{27             width: 200px;28             height: 200px;29             border: 1px solid blue;30         }31     </style>32 </head>33 <body>34     <div class="p">35         <div class="c1">36             子元素137         </div>38         <div class="c2">39             子元素2(元素2跟着上移了)40         </div>41     </div>42 </body>43 </html>

效果:

 

2、margin-left为负值像素

margin-left为负值像素,偏移值相对于自身,其后元素不受影响,见如下代码:

 1 <!DOCTYPE html> 2 <html lang="zh"> 3 <head> 4     <meta charset="UTF-8" /> 5     <meta http-equiv="X-UA-Compatible" content="ie=edge" /> 6     <title>margin不同赋值情况(负值,百分数)</title> 7     <style type="text/css"> 8         *{ 9             margin: 0;10             padding: 0;11         }12         /*父元素样式*/13         .p{14             margin: 100px;15             width: 500px;16             height: 500px;17             border: 1px solid red;18         }19         .c1{20             width: 200px;21             height: 200px;22             border: 1px solid blue;23             /*margin-left为负值像素,偏移值相对于自身,其后元素不受影响*/24             margin-left: -20px;25         }26         .c2{27             width: 200px;28             height: 200px;29             border: 1px solid blue;30         }31     </style>32 </head>33 <body>34     <div class="p">35         <div class="c1">36             子元素137         </div>38         <div class="c2">39             子元素2(子元素2不受影响)40         </div>41     </div>42 </body>43 </html>

效果:

 

3、margin-top为负值百分数

margin-top为负值百分数,偏移值相对于父元素,其后元素受影响,见如下代码:

 1 <!DOCTYPE html> 2 <html lang="zh"> 3 <head> 4     <meta charset="UTF-8" /> 5     <meta http-equiv="X-UA-Compatible" content="ie=edge" /> 6     <title>margin不同赋值情况(负值,百分数)</title> 7     <style type="text/css"> 8         *{ 9             margin: 0;10             padding: 0;11         }12         /*父元素样式*/13         .p{14             margin: 100px;15             width: 500px;16             height: 500px;17             border: 1px solid red;18         }19         .c1{20             width: 200px;21             height: 200px;22             border: 1px solid blue;23             /*margin-top为负值百分数,偏移值相对于父元素,其后元素受影响*/24             margin-top: -20%;25         }26         .c2{27             width: 200px;28             height: 200px;29             border: 1px solid blue;30         }31     </style>32 </head>33 <body>34     <div class="p">35         <div class="c1">36             子元素137         </div>38         <div class="c2">39             子元素2(子元素2受影响)40         </div>41     </div>42 </body>43 </html>

效果:

 4、margin-left为负值百分数

margin-left为负值百分数,偏移值相对于父元素,其后元素不受影响,见如下代码:

 1 <!DOCTYPE html> 2 <html lang="zh"> 3 <head> 4     <meta charset="UTF-8" /> 5     <meta http-equiv="X-UA-Compatible" content="ie=edge" /> 6     <title>margin不同赋值情况(负值,百分数)</title> 7     <style type="text/css"> 8         *{ 9             margin: 0;10             padding: 0;11         }12         /*父元素样式*/13         .p{14             margin: 100px;15             width: 500px;16             height: 500px;17             border: 1px solid red;18         }19         .c1{20             width: 200px;21             height: 200px;22             border: 1px solid blue;23             /*margin-left为负值百分数,偏移值相对于父元素,其后元素不受影响*/24             margin-left: -20%;25         }26         .c2{27             width: 200px;28             height: 200px;29             border: 1px solid blue;30         }31     </style>32 </head>33 <body>34     <div class="p">35         <div class="c1">36             子元素137         </div>38         <div class="c2">39             子元素2(子元素2不受影响)40         </div>41     </div>42 </body>43 </html>

效果:

5、margin-right为负值像素且不设置宽度

margin-right为负值像素且不设置宽度,无偏移值,其后元素不受影响,自身宽度变大,见如下代码:

 1 <!DOCTYPE html> 2 <html lang="zh"> 3 <head> 4     <meta charset="UTF-8" /> 5     <meta http-equiv="X-UA-Compatible" content="ie=edge" /> 6     <title>margin不同赋值情况(负值,百分数)</title> 7     <style type="text/css"> 8         *{ 9             margin: 0;10             padding: 0;11         }12         /*父元素样式*/13         .p{14             margin: 100px;15             width: 500px;16             height: 500px;17             border: 1px solid red;18         }19         .c1{20             /*关键点:不设置宽度*/21             /*width: 200px;*/22             height: 200px;23             border: 1px solid blue;24             /*margin-right为负值像素且不设置宽度,无偏移值,其后元素不受影响*/25             margin-right: -100px;26         }27         .c2{28             width: 200px;29             height: 200px;30             border: 1px solid blue;31         }32     </style>33 </head>34 <body>35     <div class="p">36         <div class="c1">37             子元素138         </div>39         <div class="c2">40             子元素2(子元素2不受影响)41         </div>42     </div>43 </body>44 </html>

效果:

 

 6、margin-right为负值百分数且不设置宽度

margin-right为负值百分数且不设置宽度,无偏移值,自身宽度变宽(宽度值为父元素宽度值*百分比),其后元素不受影响,见如下代码:

 1 <!DOCTYPE html> 2 <html lang="zh"> 3 <head> 4     <meta charset="UTF-8" /> 5     <meta http-equiv="X-UA-Compatible" content="ie=edge" /> 6     <title>margin不同赋值情况(负值,百分数)</title> 7     <style type="text/css"> 8         *{ 9             margin: 0;10             padding: 0;11         }12         /*父元素样式*/13         .p{14             margin: 100px;15             width: 500px;16             height: 500px;17             border: 1px solid red;18         }19         .c1{20             /*关键点:不设置宽度*/21             /*width: 200px;*/22             height: 200px;23             border: 1px solid blue;24             /*margin-right为负值百分数且不设置宽度,无偏移值,自身宽度变宽(宽度值为父元素宽度值*百分比),其后元素不受影响*/25             margin-right: -20%;26         }27         .c2{28             width: 200px;29             height: 200px;30             border: 1px solid blue;31         }32     </style>33 </head>34 <body>35     <div class="p">36         <div class="c1">37             子元素138         </div>39         <div class="c2">40             子元素2(子元素2不受影响)41         </div>42     </div>43 </body>44 </html>

 

效果:

7、margin-bottom:为负值像素

margin-bottom:为负值像素,自身无偏移值,,其后元素受影响(上移了),见如下代码:

 1 <!DOCTYPE html> 2 <html lang="zh"> 3 <head> 4     <meta charset="UTF-8" /> 5     <meta http-equiv="X-UA-Compatible" content="ie=edge" /> 6     <title>margin不同赋值情况(负值,百分数)</title> 7     <style type="text/css"> 8         *{ 9             margin: 0;10             padding: 0;11         }12         /*父元素样式*/13         .p{14             margin: 100px;15             width: 500px;16             height: 500px;17             border: 1px solid red;18         }19         .c1{20             width: 200px;21             height: 200px;22             border: 1px solid blue;23             /*margin-bottom:为负值像素,自身无偏移值,,其后元素受影响(上移了)*/24             margin-bottom: -100px;25         }26         .c2{27             width: 200px;28             height: 200px;29             border: 1px solid blue;30         }31     </style>32 </head>33 <body>34     <div class="p">35         <div class="c1">36             子元素137         </div>38         <div class="c2">39             子元素2(子元素2受影响,上移了)40         </div>41     </div>42 </body>43 </html>

 

 效果:

 

 8、margin-bottom:为负值百分数

margin-bottom:为负值百分数,自身无偏移值,,其后元素受影响(上移了,上移大小为父元素宽度值*20%),见如下代码:

 

 1 <!DOCTYPE html> 2 <html lang="zh"> 3 <head> 4     <meta charset="UTF-8" /> 5     <meta http-equiv="X-UA-Compatible" content="ie=edge" /> 6     <title>margin不同赋值情况(负值,百分数)</title> 7     <style type="text/css"> 8         *{ 9             margin: 0;10             padding: 0;11         }12         /*父元素样式*/13         .p{14             margin: 100px;15             width: 800px;16             height: 500px;17             border: 1px solid red;18         }19         .c1{20             width: 200px;21             height: 200px;22             border: 1px solid blue;23             /*margin-bottom:为负值百分数,自身无偏移值,,其后元素受影响(上移了,上移大小为父元素宽度值*20%)*/24             margin-bottom: -20%;25         }26         .c2{27             width: 200px;28             height: 200px;29             border: 1px solid blue;30         }31     </style>32 </head>33 <body>34     <div class="p">35         <div class="c1">36             子元素137         </div>38         <div class="c2">39             子元素2(子元素2受影响,上移了)40         </div>41     </div>42 </body>43 </html>

 

效果:

总结:以上是margin赋值为负值的情况,可使自身偏移(或不偏移),其后元素受影响(或不受影响),自身宽度增大(或不增大),会有多种不同的应用场景,请合理选择。

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