DIV内容垂直居中 - MySomeDay
css垂直居中属性设置vertical-align: middle对div不起作用,例如:
<span style="color: #008080;"> 1</span> <span style="color: #0000ff;"><span style="color: #ff00ff;">DOCTYPE html</span><span style="color: #0000ff;">></span> <span style="color: #008080;"> 2</span> <span style="color: #0000ff;"><span style="color: #800000;">html </span><span style="color: #ff0000;">lang</span><span style="color: #0000ff;">="zh-CN"</span><span style="color: #0000ff;">></span> <span style="color: #008080;"> 3</span> <span style="color: #0000ff;"><span style="color: #800000;">head</span><span style="color: #0000ff;">></span> <span style="color: #008080;"> 4</span> <span style="color: #0000ff;"><span style="color: #800000;">meta </span><span style="color: #ff0000;">charset</span><span style="color: #0000ff;">="utf-8"</span><span style="color: #0000ff;">></span> <span style="color: #008080;"> 5</span> <span style="color: #0000ff;"><span style="color: #800000;">meta </span><span style="color: #ff0000;">http-equiv</span><span style="color: #0000ff;">="X-UA-Commpatible"</span><span style="color: #ff0000;"> content</span><span style="color: #0000ff;">="IE=edge"</span><span style="color: #0000ff;">></span> <span style="color: #008080;"> 6</span> <span style="color: #0000ff;"><span style="color: #800000;">title</span><span style="color: #0000ff;">></span>DIV垂直居中对齐<span style="color: #0000ff;"></span><span style="color: #800000;">title</span><span style="color: #0000ff;">></span> <span style="color: #008080;"> 7</span> <span style="color: #0000ff;"><span style="color: #800000;">style </span><span style="color: #ff0000;">type</span><span style="color: #0000ff;">="text/css"</span><span style="color: #0000ff;">></span> <span style="color: #008080;"> 8</span> <span style="background-color: #f5f5f5; color: #800000;">* </span><span style="background-color: #f5f5f5; color: #000000;">{</span> <span style="color: #008080;"> 9</span> <span style="background-color: #f5f5f5; color: #ff0000;"> margin</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 0</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;">10</span> <span style="background-color: #f5f5f5; color: #ff0000;"> padding</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 0</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;">11</span> <span style="background-color: #f5f5f5; color: #000000;">}</span> <span style="color: #008080;">12</span> <span style="color: #008080;">13</span> <span style="background-color: #f5f5f5; color: #800000;">html, body </span><span style="background-color: #f5f5f5; color: #000000;">{</span> <span style="color: #008080;">14</span> <span style="background-color: #f5f5f5; color: #ff0000;"> width</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 100%</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;">15</span> <span style="background-color: #f5f5f5; color: #ff0000;"> height</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 100%</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;">16</span> <span style="background-color: #f5f5f5; color: #000000;">}</span> <span style="color: #008080;">17</span> <span style="color: #008080;">18</span> <span style="background-color: #f5f5f5; color: #800000;">body </span><span style="background-color: #f5f5f5; color: #000000;">{</span><span style="background-color: #f5f5f5; color: #ff0000;">text-align</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> center</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #ff0000;"> vertical-align</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> middle</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #000000;">}</span> <span style="color: #008080;">19</span> <span style="background-color: #f5f5f5; color: #800000;">.outer </span><span style="background-color: #f5f5f5; color: #000000;">{</span> <span style="color: #008080;">20</span> <span style="background-color: #f5f5f5; color: #ff0000;"> width</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 400px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;">21</span> <span style="background-color: #f5f5f5; color: #ff0000;"> height</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 120px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;">22</span> <span style="background-color: #f5f5f5; color: #ff0000;"> position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> relative</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;">23</span> <span style="background-color: #f5f5f5; color: #ff0000;"> left</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 20px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;">24</span> <span style="background-color: #f5f5f5; color: #ff0000;"> top</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 20px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;">25</span> <span style="background-color: #f5f5f5; color: #ff0000;"> text-align</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> center</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;">26</span> <span style="background-color: #f5f5f5; color: #ff0000;"> vertical-align</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> middle</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;">27</span> <span style="background-color: #f5f5f5; color: #ff0000;"> border</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 1px dashed blue</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;">28</span> <span style="background-color: #f5f5f5; color: #000000;">}</span> <span style="color: #008080;">29</span> <span style="color: #008080;">30</span> <span style="background-color: #f5f5f5; color: #800000;">.button </span><span style="background-color: #f5f5f5; color: #000000;">{</span> <span style="color: #008080;">31</span> <span style="background-color: #f5f5f5; color: #ff0000;"> width</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 200px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;">32</span> <span style="background-color: #f5f5f5; color: #ff0000;"> height</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 40px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;">33</span> <span style="background-color: #f5f5f5; color: #000000;">}</span> <span style="color: #008080;">34</span> <span style="color: #0000ff;"></span><span style="color: #800000;">style</span><span style="color: #0000ff;">></span> <span style="color: #008080;">35</span> <span style="color: #0000ff;"></span><span style="color: #800000;">head</span><span style="color: #0000ff;">></span> <span style="color: #008080;">36</span> <span style="color: #0000ff;"><span style="color: #800000;">body</span><span style="color: #0000ff;">></span> <span style="color: #008080;">37</span> <span style="color: #0000ff;"><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">='outer'</span><span style="color: #0000ff;">></span> <span style="color: #008080;">38</span> <span style="color: #0000ff;"><span style="color: #800000;">button </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">='button'</span><span style="color: #0000ff;">></span>在DIV中垂直居中<span style="color: #0000ff;"></span><span style="color: #800000;">button</span><span style="color: #0000ff;">></span> <span style="color: #008080;">39</span> <span style="color: #0000ff;"></span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span> <span style="color: #008080;">40</span> <span style="color: #0000ff;"></span><span style="color: #800000;">body</span><span style="color: #0000ff;">></span> <span style="color: #008080;">41</span> <span style="color: #0000ff;"></span><span style="color: #800000;">html</span><span style="color: #0000ff;">></span></span></span></span></span></span></span></span></span></span></span>
运行后按钮没有在DIV中垂直居中:
解决思路:如果div和按钮的宽高都确定为具体像素值,可以直接设定按钮的css属性:position:relative; top为(div.height - button.height)/2,left为(div.width-button.height)/2;否则给按钮添加一个div父元素,宽高和按钮相 同,position设定为relative,top和left都为50%(即左上角位置设定在外层div的中心),再将按钮左上角位置坐标设定为父元素 div宽高(也等于按钮自身宽高)的-50%
详细代码如下:
<span style="color: #008080;"> 1</span> <span style="color: #0000ff;"><span style="color: #ff00ff;">DOCTYPE html</span><span style="color: #0000ff;">></span> <span style="color: #008080;"> 2</span> <span style="color: #0000ff;"><span style="color: #800000;">html </span><span style="color: #ff0000;">lang</span><span style="color: #0000ff;">="zh-CN"</span><span style="color: #0000ff;">></span> <span style="color: #008080;"> 3</span> <span style="color: #0000ff;"><span style="color: #800000;">head</span><span style="color: #0000ff;">></span> <span style="color: #008080;"> 4</span> <span style="color: #0000ff;"><span style="color: #800000;">meta </span><span style="color: #ff0000;">charset</span><span style="color: #0000ff;">="utf-8"</span><span style="color: #0000ff;">></span> <span style="color: #008080;"> 5</span> <span style="color: #0000ff;"><span style="color: #800000;">meta </span><span style="color: #ff0000;">http-equiv</span><span style="color: #0000ff;">="X-UA-Commpatible"</span><span style="color: #ff0000;"> content</span><span style="color: #0000ff;">="IE=edge"</span><span style="color: #0000ff;">></span> <span style="color: #008080;"> 6</span> <span style="color: #0000ff;"><span style="color: #800000;">title</span><span style="color: #0000ff;">></span>DIV垂直居中对齐<span style="color: #0000ff;"></span><span style="color: #800000;">title</span><span style="color: #0000ff;">></span> <span style="color: #008080;"> 7</span> <span style="color: #0000ff;"><span style="color: #800000;">style </span><span style="color: #ff0000;">type</span><span style="color: #0000ff;">="text/css"</span><span style="color: #0000ff;">></span> <span style="color: #008080;"> 8</span> <span style="background-color: #f5f5f5; color: #800000;">* </span><span style="background-color: #f5f5f5; color: #000000;">{</span> <span style="color: #008080;"> 9</span> <span style="background-color: #f5f5f5; color: #ff0000;"> margin</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 0</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;">10</span> <span style="background-color: #f5f5f5; color: #ff0000;"> padding</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 0</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;">11</span> <span style="background-color: #f5f5f5; color: #000000;">}</span> <span style="color: #008080;">12</span> <span style="color: #008080;">13</span> <span style="background-color: #f5f5f5; color: #800000;">html, body </span><span style="background-color: #f5f5f5; color: #000000;">{</span> <span style="color: #008080;">14</span> <span style="background-color: #f5f5f5; color: #ff0000;"> width</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 100%</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;">15</span> <span style="background-color: #f5f5f5; color: #ff0000;"> height</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 100%</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;">16</span> <span style="background-color: #f5f5f5; color: #000000;">}</span> <span style="color: #008080;">17</span> <span style="color: #008080;">18</span> <span style="background-color: #f5f5f5; color: #800000;">body </span><span style="background-color: #f5f5f5; color: #000000;">{</span><span style="background-color: #f5f5f5; color: #ff0000;">text-align</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> center</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #ff0000;"> vertical-align</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> middle</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #000000;">}</span> <span style="color: #008080;">19</span> <span style="background-color: #f5f5f5; color: #800000;">.outer </span><span style="background-color: #f5f5f5; color: #000000;">{</span> <span style="color: #008080;">20</span> <span style="background-color: #f5f5f5; color: #ff0000;"> width</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 400px</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #008000;">/*</span><span style="background-color: #f5f5f5; color: #008000;"> 或者为百分比 </span><span style="background-color: #f5f5f5; color: #008000;">*/</span> <span style="color: #008080;">21</span> <span style="background-color: #f5f5f5; color: #ff0000;"> height</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 120px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;">22</span> <span style="background-color: #f5f5f5; color: #ff0000;"> position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> relative</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;">23</span> <span style="background-color: #f5f5f5; color: #ff0000;"> left</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 20px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;">24</span> <span style="background-color: #f5f5f5; color: #ff0000;"> top</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 20px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;">25</span> <span style="background-color: #f5f5f5; color: #ff0000;"> border</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 1px dashed blue</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;">26</span> <span style="background-color: #f5f5f5; color: #000000;">}</span> <span style="color: #008080;">27</span> <span style="color: #008080;">28</span> <span style="background-color: #f5f5f5; color: #800000;">.inner </span><span style="background-color: #f5f5f5; color: #000000;">{</span> <span style="color: #008080;">29</span> <span style="background-color: #f5f5f5; color: #ff0000;"> width</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 200px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;">30</span> <span style="background-color: #f5f5f5; color: #ff0000;"> height</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 40px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;">31</span> <span style="background-color: #f5f5f5; color: #ff0000;"> position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> relative</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;">32</span> <span style="background-color: #f5f5f5; color: #ff0000;"> position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> relative</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;">33</span> <span style="background-color: #f5f5f5; color: #ff0000;"> top</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 50%</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;">34</span> <span style="background-color: #f5f5f5; color: #ff0000;"> left</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 50%</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;">35</span> <span style="background-color: #f5f5f5; color: #000000;">}</span> <span style="color: #008080;">36</span> <span style="color: #008080;">37</span> <span style="background-color: #f5f5f5; color: #800000;">.button </span><span style="background-color: #f5f5f5; color: #000000;">{</span> <span style="color: #008080;">38</span> <span style="background-color: #f5f5f5; color: #ff0000;"> width</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 200px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;">39</span> <span style="background-color: #f5f5f5; color: #ff0000;"> height</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 40px</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;">40</span> <span style="background-color: #f5f5f5; color: #ff0000;"> position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> relative</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;">41</span> <span style="background-color: #f5f5f5; color: #ff0000;"> top</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -50%</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;">42</span> <span style="background-color: #f5f5f5; color: #ff0000;"> left</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -50%</span><span style="background-color: #f5f5f5; color: #000000;">;</span> <span style="color: #008080;">43</span> <span style="background-color: #f5f5f5; color: #000000;">}</span> <span style="color: #008080;">44</span> <span style="color: #0000ff;"></span><span style="color: #800000;">style</span><span style="color: #0000ff;">></span> <span style="color: #008080;">45</span> <span style="color: #0000ff;"></span><span style="color: #800000;">head</span><span style="color: #0000ff;">></span> <span style="color: #008080;">46</span> <span style="color: #0000ff;"><span style="color: #800000;">body</span><span style="color: #0000ff;">></span> <span style="color: #008080;">47</span> <span style="color: #0000ff;"><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">='outer'</span><span style="color: #0000ff;">></span> <span style="color: #008080;">48</span> <span style="color: #0000ff;"><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">='inner'</span><span style="color: #0000ff;">></span> <span style="color: #008080;">49</span> <span style="color: #0000ff;"><span style="color: #800000;">button </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">='button'</span><span style="color: #0000ff;">></span>在DIV中垂直居中<span style="color: #0000ff;"></span><span style="color: #800000;">button</span><span style="color: #0000ff;">></span> <span style="color: #008080;">50</span> <span style="color: #0000ff;"></span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span> <span style="color: #008080;">51</span> <span style="color: #0000ff;"></span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span> <span style="color: #008080;">52</span> <span style="color: #0000ff;"></span><span style="color: #800000;">body</span><span style="color: #0000ff;">></span> <span style="color: #008080;">53</span> <span style="color: #0000ff;"></span><span style="color: #800000;">html</span><span style="color: #0000ff;">></span></span></span></span></span></span></span></span></span></span></span></span>
再次运行后,div中按钮上下居中显示
END

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