如何让菜单以所有显示为中心

Question

http://jsfiddle.net/aw4zgwso/

此处发生了什么，除非我向width:40%添加.menu之类的内容，否则我似乎无法将导航菜单置于中心位置，但这并不是＃＆＃ 39; t工作得很好，会在较小分辨率的显示器上敲下文本

＆＃13;

＆＃13;

.nav { 
  width:100%; 
  height:40px; 
  display:block; 
  background-color:#313131;
}

.nav_inner {
  height:100%; 
  margin:0 auto; 
  position:relative;
}


.nav_menu {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  height: 40px;
  line-height: 15px;

}

.nav_menu li {
  float: left;
}

.nav_menu li a {
  display: block;
  color:#ffffff;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

.nav_menu a:hover {
  background-color: red;
  color:white;
}

.clearfix:after {
  display:block;
  clear:both;
}

/*----- Menu Outline -----*/
.menu-wrap {
  width:100%;
  background:#3e3436;
}

.menu {
  margin:0px auto;
}

.menu li {
  margin:0px;
  list-style:none;
}

.menu a {
  color:#ffffff;
  text-decoration:none;
}

.menu li:hover > a, .menu .current-item > a {
  text-decoration:none;
  color:#ffffff;
}

.menu .arrow {
  font-size:12px;
  line-height:0%;
  color:#00AAFF;	
  padding-left: 5px;
}

/*----- Top Level -----*/
.menu > ul > li {
  float:left;
  display:inline-block;
  position:relative;
  font-size:16px;
  color: #ffffff;
}

.menu > ul > li > a {
  padding:9px 40px;
  display:inline-block;
}

.menu > ul > li:hover > a, .menu > ul > .current-item > a {
  background:#191919;
}

/*----- Bottom Level -----*/
.menu li:hover .sub-menu {
  z-index:1;
  opacity:1;
}

.sub-menu {
  width:160%;
  padding:5px 0px;
  position:absolute;
  top:95%;
  left:0px;
  z-index:-1;
  opacity:0;
  transition:opacity linear 0.15s;
  background:#313131;
}

.sub-menu li {
  display:block;
  font-size:16px;
}

.sub-menu li a {
  padding:10px 30px;
  display:block;
}

.sub-menu li a:hover, .sub-menu .current-item a {
  background:#191919;
}

＆＃13;

<div class="nav">
    <div class="nav_inner">
        <nav class="hide-mobile menu">
            <ul class="clearfix">
                <li><a href="index.html">Home</a></li>
                <li><a href="#" style="cursor: default;">About us<span class="arrow">&#9660;</span></a>
                    <ul class="sub-menu">
                        <li><a href="our-values.html">Our Values</a></li>
                        <li><a href="technology-partners.html">Technology Partners</a></li>
                    </ul>
                </li>
                <li><a href="#" style="cursor: default;">IT Solutions<span class="arrow">&#9660;</span></a>
                    <ul class="sub-menu">
                        <li><a href="audio-visual.html">Audio Visual</a></li>
                        <li><a href="backup-replication-business-continuity.html">Backup, Replication and 
						<li><a href="visitor-and-entry-management.html">Visitor &amp; Entry Management</a></li>
                    </ul>
                </li>
                <li><a href="contact-us.html">Contact Us</a></li>
            </ul>
        </nav>
    </div>
</div>

＆＃13;

＆＃13;

＆＃13;

Answer 1

你可以简单地使用public class WindowedFileNames extends FilenamePolicy implements OrangeStreamConstants{ /** * */ private static final long serialVersionUID = 1L; private static Logger logger = LoggerFactory.getLogger(WindowedFileNames.class); protected final String outputPath; public WindowedFileNames(String outputPath) { this.outputPath = outputPath; } @Override public ResourceId windowedFilename(ResourceId outputDirectory, WindowedContext context, String extension) { IntervalWindow intervalWindow = (IntervalWindow) context.getWindow(); DateTime date = intervalWindow.maxTimestamp().toDateTime(DateTimeZone.forID("America/New_York")); String fileName = String.format(FOLDER_EXPR, outputPath, //"orangestreaming", DAY_FORMAT.print(date), HOUR_MIN_FORMAT.print(date) + HYPHEN + context.getShardNumber()); logger.error(fileName+"::::: File name for the current minute"); return outputDirectory .getCurrentDirectory() .resolve(fileName, StandardResolveOptions.RESOLVE_FILE); } @Override public ResourceId unwindowedFilename(ResourceId outputDirectory, Context context, String extension) { return null; } } 并使text-align:center 内联阻止像这样：

li

这是完整的代码

＆＃13;

＆＃13;

.menu>ul {
  text-align: center;
  margin: 0;
  padding: 0;
}

.menu>ul>li {
  display: inline-block;
  position: relative;
  font-size: 16px;
  color: #ffffff;
}

＆＃13;

.nav {
  width: 100%;
  height: 40px;
  display: block;
  background-color: #313131;
}

.nav_inner {
  height: 100%;
  margin: 0 auto;
  position: relative;
}

.nav_menu {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  height: 40px;
  line-height: 15px;
}

.nav_menu li {
  float: left;
}

.nav_menu li a {
  display: block;
  color: #ffffff;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

.nav_menu a:hover {
  background-color: red;
  color: white;
}

.clearfix:after {
  display: block;
  clear: both;
}


/*----- Menu Outline -----*/

.menu-wrap {
  width: 100%;
  background: #3e3436;
}

.menu {
  margin: 0px auto;
}

.menu li {
  margin: 0px;
  list-style: none;
}

.menu a {
  color: #ffffff;
  text-decoration: none;
}

.menu li:hover>a,
.menu .current-item>a {
  text-decoration: none;
  color: #ffffff;
}

.menu .arrow {
  font-size: 12px;
  line-height: 0%;
  color: #00AAFF;
  padding-left: 5px;
}


/*----- Top Level -----*/

.menu>ul {
  text-align: center;
  margin: 0;
  padding: 0;
}

.menu>ul>li {
  display: inline-block;
  position: relative;
  font-size: 16px;
  color: #ffffff;
}

.menu>ul>li>a {
  padding: 9px 40px;
  display: inline-block;
}

.menu>ul>li:hover>a,
.menu>ul>.current-item>a {
  background: #191919;
}


/*----- Bottom Level -----*/

.menu li:hover .sub-menu {
  z-index: 1;
  opacity: 1;
}

.sub-menu {
  width: 160%;
  padding: 5px 0px;
  position: absolute;
  top: 95%;
  left: 0px;
  z-index: -1;
  opacity: 0;
  transition: opacity linear 0.15s;
  background: #313131;
}

.sub-menu li {
  display: block;
  font-size: 16px;
}

.sub-menu li a {
  padding: 10px 30px;
  display: block;
}

.sub-menu li a:hover,
.sub-menu .current-item a {
  background: #191919;
}

＆＃13;

＆＃13;

＆＃13;

Answer 2

试试这个：

ul {
    text-align: center; 
}
.menu > ul > li {
    float: none;
}

Answer 3

为父级（text-align: center;）设置.menu，为子级display: inline-block;设置.clearfix。

.menu {
    text-align: center;
}

.clearfix {
    display: inline-block;
    padding:0;
}

.menu li {
    bottom: 12px;
    //more code...
}

＆＃13;

＆＃13;

.nav { width:100%; height:40px; display:block; background-color:#313131;}

.nav_inner {height:100%; margin:0 auto; position:relative;}


.nav_menu {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    height: 40px;
    line-height: 15px;
    
}

.nav_menu li {
    float: left;
}

.nav_menu li a {
    display: block;
    color:#ffffff;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
}

.nav_menu a:hover {
    background-color: red;
    color:white;
}



.clearfix:after {
    display:block;
    clear:both;
}
 
/*----- Menu Outline -----*/
.menu-wrap {
    width:100%;
    background:#3e3436;
}
 
.menu {
    text-align: center;
}

.clearfix {
    display: inline-block;
    padding:0;
}

.menu li {
    bottom: 12px;
    list-style:none;

}
 
.menu a {
    color:#ffffff;
    text-decoration:none;
}
 
.menu li:hover > a, .menu .current-item > a {
    text-decoration:none;
    color:#ffffff;
}
 
.menu .arrow {
    font-size:12px;
    line-height:0%;
    color:#00AAFF;  
    padding-left: 5px;
}
 
/*----- Top Level -----*/
.menu > ul > li {
    float:left;
    display:inline-block;
    position:relative;
    font-size:16px;
    color: #ffffff;
}
 
.menu > ul > li > a {
    padding:9px 40px;
    display:inline-block;
}
 
.menu > ul > li:hover > a, .menu > ul > .current-item > a {
    background:#191919;
}
 
/*----- Bottom Level -----*/
.menu li:hover .sub-menu {
    z-index:1;
    opacity:1;
}
 
.sub-menu {
    width:160%;
    padding:5px 0px;
    position:absolute;
    top:95%;
    left:0px;
    z-index:-1;
    opacity:0;
    transition:opacity linear 0.15s;
    background:#313131;
}
 
.sub-menu li {
    display:block;
    font-size:16px;
}
 
.sub-menu li a {
    padding:10px 30px;
    display:block;
}
 
.sub-menu li a:hover, .sub-menu .current-item a {
    background:#191919;
} 

＆＃13;

<div class="nav">
    <div class="nav_inner"> 
        
        <nav class="hide-mobile menu">
            <ul class="clearfix">
            
                <li><a href="index.html">Home</a></li>
                
                <li><a href="#" style="cursor: default;">About us<span class="arrow">&#9660;</span></a>
     
                    <ul class="sub-menu">
                        <li><a href="our-values.html">Our Values</a></li>
                        <li><a href="technology-partners.html">Technology Partners</a></li>
                    </ul>
                
                </li>           
                
                <li><a href="#" style="cursor: default;">IT Solutions<span class="arrow">&#9660;</span></a>
                
                   <ul class="sub-menu">
                            <li><a href="audio-visual.html">Audio Visual</a></li>
                            <li><a href="backup-replication-business-continuity.html">Backup, Replication and 
                            <li><a href="visitor-and-entry-management.html">Visitor &amp; Entry Management</a></li>
                    </ul>
                
                </li>
                
                
                        
                <li><a href="contact-us.html">Contact Us</a></li>
                
            </ul>
        </nav>

    </div>
</div>

＆＃13;

＆＃13;

＆＃13;

Answer 4

要使菜单居中，您只需将此CSS添加到菜单中即可。我非常确定它对你有帮助。

.menu ul {
    margin: 0 auto;
    display: table;
}
.nav { 
  width:100%; 
  height:40px; 
  display:block; 
  background-color:#313131;
}

.nav_inner {
  height:100%; 
  margin:0 auto; 
  position:relative;
}


.nav_menu {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  height: 40px;
  line-height: 15px;

}

.nav_menu li {
  float: left;
}

.nav_menu li a {
  display: block;
  color:#ffffff;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

.nav_menu a:hover {
  background-color: red;
  color:white;
}

.clearfix:after {
  display:block;
  clear:both;
}

/*----- Menu Outline -----*/
.menu-wrap {
  width:100%;
  background:#3e3436;
}

.menu {
  margin:0px auto;
}

.menu li {
  margin:0px;
  list-style:none;
}

.menu a {
  color:#ffffff;
  text-decoration:none;
}

.menu li:hover > a, .menu .current-item > a {
  text-decoration:none;
  color:#ffffff;
}

.menu .arrow {
  font-size:12px;
  line-height:0%;
  color:#00AAFF;	
  padding-left: 5px;
}

/*----- Top Level -----*/
.menu > ul > li {
  float:left;
  display:inline-block;
  position:relative;
  font-size:16px;
  color: #ffffff;
}

.menu > ul > li > a {
  padding:9px 40px;
  display:inline-block;
}

.menu > ul > li:hover > a, .menu > ul > .current-item > a {
  background:#191919;
}

/*----- Bottom Level -----*/
.menu li:hover .sub-menu {
  z-index:1;
  opacity:1;
}

.sub-menu {
  width:160%;
  padding:5px 0px;
  position:absolute;
  top:95%;
  left:0px;
  z-index:-1;
  opacity:0;
  transition:opacity linear 0.15s;
  background:#313131;
}

.sub-menu li {
  display:block;
  font-size:16px;
}

.sub-menu li a {
  padding:10px 30px;
  display:block;
}

.sub-menu li a:hover, .sub-menu .current-item a {
  background:#191919;
}

<div class="nav">
    <div class="nav_inner">
        <nav class="hide-mobile menu">
            <ul class="clearfix">
                <li><a href="index.html">Home</a></li>
                <li><a href="#" style="cursor: default;">About us<span class="arrow">&#9660;</span></a>
                    <ul class="sub-menu">
                        <li><a href="our-values.html">Our Values</a></li>
                        <li><a href="technology-partners.html">Technology Partners</a></li>
                    </ul>
                </li>
                <li><a href="#" style="cursor: default;">IT Solutions<span class="arrow">&#9660;</span></a>
                    <ul class="sub-menu">
                        <li><a href="audio-visual.html">Audio Visual</a></li>
                        <li><a href="backup-replication-business-continuity.html">Backup, Replication and 
						<li><a href="visitor-and-entry-management.html">Visitor &amp; Entry Management</a></li>
                    </ul>
                </li>
                <li><a href="contact-us.html">Contact Us</a></li>
            </ul>
        </nav>
    </div>
</div>

Answer 5

使用text-align: center水平居中嵌套元素

如果您在包含的父元素（text-align: center）上声明.menu > ul，请移除可能偏移水平对齐的任意margin或padding，并移除{{1在列表项（float）上声明的规则 - 您应该达到预期的结果。

注意：进行水平对齐，使用li按预期工作，应满足一些要求：

1. 包含的父元素必须是块元素（例如： text-align: center）
2. 您需要居中的嵌套元素应为 inline-block 元素（例如：display: block）
3. 不应在嵌套元素上声明display: inline-block规则 为了水平对齐，float规则将否定任何努力 以这种方式对齐元素

float

.nav { 
  width:100%; 
  height:40px; 
  display:block; 
  background-color:#313131;
}

.nav_inner {
  height:100%; 
  margin:0 auto; 
  position:relative;
}


.nav_menu {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  height: 40px;
  line-height: 15px;

}

/* Additional */
.menu > ul {
    margin: auto;
    padding: 0px; /* remove arbitrary padding */
    text-align: center;
}
/* end Additional */

.nav_menu li {
  float: left;
}

.nav_menu li a {
  display: block;
  color:#ffffff;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

.nav_menu a:hover {
  background-color: red;
  color:white;
}

.clearfix:after {
  display:block;
  clear:both;
}

/*----- Menu Outline -----*/
.menu-wrap {
  width:100%;
  background:#3e3436;
}

.menu {
  margin:0px auto;
}

.menu li {
  margin:0px;
  list-style:none;
}

.menu a {
  color:#ffffff;
  text-decoration:none;
}

.menu li:hover > a, .menu .current-item > a {
  text-decoration:none;
  color:#ffffff;
}

.menu .arrow {
  font-size:12px;
  line-height:0%;
  color:#00AAFF;	
  padding-left: 5px;
}

/*----- Top Level -----*/
.menu > ul > li {
  float:none; /* remove float */
  display:inline-block;
  position:relative;
  font-size:16px;
  color: #ffffff;
}

.menu > ul > li > a {
  padding:9px 40px;
  display:inline-block;
}

.menu > ul > li:hover > a, .menu > ul > .current-item > a {
  background:#191919;
}

/*----- Bottom Level -----*/
.menu li:hover .sub-menu {
  z-index:1;
  opacity:1;
}

.sub-menu {
  width:160%;
  padding:5px 0px;
  position:absolute;
  top:95%;
  left:0px;
  z-index:-1;
  opacity:0;
  transition:opacity linear 0.15s;
  background:#313131;
}

.sub-menu li {
  display:block;
  font-size:16px;
  text-align: left; /* retain left text-alignment on submenu list items */
}

.sub-menu li a {
  padding:10px 30px;
  display:block;
}

.sub-menu li a:hover, .sub-menu .current-item a {
  background:#191919;
}

或者......你可以只使用Flex ...

使用<div class="nav"> <div class="nav_inner"> <nav class="hide-mobile menu"> <ul class="clearfix"> <li><a href="index.html">Home</a></li> <li><a href="#" style="cursor: default;">About us<span class="arrow">&#9660;</span></a> <ul class="sub-menu"> <li><a href="our-values.html">Our Values</a></li> <li><a href="technology-partners.html">Technology Partners</a></li> </ul> </li> <li><a href="#" style="cursor: default;">IT Solutions<span class="arrow">&#9660;</span></a> <ul class="sub-menu"> <li><a href="audio-visual.html">Audio Visual</a></li> <li><a href="backup-replication-business-continuity.html">Backup, Replication and <li><a href="visitor-and-entry-management.html">Visitor &amp; Entry Management</a></li> </ul> </li> <li><a href="contact-us.html">Contact Us</a></li> </ul> </nav> </div> </div>水平居中嵌套元素

通过在父元素和flex-box上声明display: flex，您将能够水平居中元素。 justify-content: center实际上非常适合列表项，因为它通常需要特定的嵌套子项，例如： ordered （flex-box）或 unordered < / em>（ol）仅列出接受ul元素作为有效标记的直接嵌套子元素，li通常具有父对直子“依赖关系”（所以在其他单词，flex-box规则对于直接嵌套的子项非常有用，但可能会对您在DOM树中更深层次嵌套的其他元素产生负面影响，而这些元素是您想要或不想要的。）

flex-box

请参阅以下展开/* Additional */ .menu > ul { display: flex; padding: 0px; margin: auto; justify-content: center; } 解决方案

的折叠代码段

flex-box

.nav { 
  width:100%; 
  height:40px; 
  display:block; 
  background-color:#313131;
}

.nav_inner {
  height:100%; 
  margin:0 auto; 
  position:relative;
}


.nav_menu {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  height: 40px;
  line-height: 15px;

}

/* Additional */
.menu > ul {
    display: flex;
    padding: 0px;
    margin: auto;
    justify-content: center;
}
/* end Additional */

.nav_menu li {
  float: left;
}

.nav_menu li a {
  display: block;
  color:#ffffff;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

.nav_menu a:hover {
  background-color: red;
  color:white;
}

.clearfix:after {
  display:block;
  clear:both;
}

/*----- Menu Outline -----*/
.menu-wrap {
  width:100%;
  background:#3e3436;
}

.menu {
  margin:0px auto;
}

.menu li {
  margin:0px;
  list-style:none;
}

.menu a {
  color:#ffffff;
  text-decoration:none;
}

.menu li:hover > a, .menu .current-item > a {
  text-decoration:none;
  color:#ffffff;
}

.menu .arrow {
  font-size:12px;
  line-height:0%;
  color:#00AAFF;	
  padding-left: 5px;
}

/*----- Top Level -----*/
.menu > ul > li {
  float:left;
  display:inline-block;
  position:relative;
  font-size:16px;
  color: #ffffff;
}

.menu > ul > li > a {
  padding:9px 40px;
  display:inline-block;
}

.menu > ul > li:hover > a, .menu > ul > .current-item > a {
  background:#191919;
}

/*----- Bottom Level -----*/
.menu li:hover .sub-menu {
  z-index:1;
  opacity:1;
}

.sub-menu {
  width:160%;
  padding:5px 0px;
  position:absolute;
  top:95%;
  left:0px;
  z-index:-1;
  opacity:0;
  transition:opacity linear 0.15s;
  background:#313131;
}

.sub-menu li {
  display:block;
  font-size:16px;
  text-align: left; /* retain left text-alignment on submenu list items */
}

.sub-menu li a {
  padding:10px 30px;
  display:block;
}

.sub-menu li a:hover, .sub-menu .current-item a {
  background:#191919;
}

抬头！ <div class="nav"> <div class="nav_inner"> <nav class="hide-mobile menu"> <ul class="clearfix"> <li><a href="index.html">Home</a></li> <li><a href="#" style="cursor: default;">About us<span class="arrow">&#9660;</span></a> <ul class="sub-menu"> <li><a href="our-values.html">Our Values</a></li> <li><a href="technology-partners.html">Technology Partners</a></li> </ul> </li> <li><a href="#" style="cursor: default;">IT Solutions<span class="arrow">&#9660;</span></a> <ul class="sub-menu"> <li><a href="audio-visual.html">Audio Visual</a></li> <li><a href="backup-replication-business-continuity.html">Backup, Replication and <li><a href="visitor-and-entry-management.html">Visitor &amp; Entry Management</a></li> </ul> </li> <li><a href="contact-us.html">Contact Us</a></li> </ul> </nav> </div> </div>对旧版浏览器的支持很少或有限，所以如果这对您来说是个问题，那么最好不要在生产中使用它。 / p>

IE＆lt; = 9 - 不支持
IE 10,11 - 部分支持
查看更多内容： https://caniuse.com/#feat=flexbox

Answer 6

/ HTML /

<div class="nav">
    <div class="nav_inner"> 

        <nav class="hide-mobile menu">
            <ul class="navs">

                <li><a href="index.html">Home</a></li>

                <li><a href="#" style="cursor: default;">About us<span class="arrow">&#9660;</span></a>

                    <ul class="sub-menu">
                        <li><a href="our-values.html">Our Values</a></li>
                        <li><a href="technology-partners.html">Technology Partners</a></li>
                    </ul>

                </li>           

                <li><a href="#" style="cursor: default;">IT Solutions<span class="arrow">&#9660;</span></a>

                   <ul class="sub-menu">
                            <li><a href="audio-visual.html">Audio Visual</a></li>
                            <li><a href="backup-replication-business-continuity.html">Backup, Replication and 
                            <li><a href="visitor-and-entry-management.html">Visitor &amp; Entry Management</a></li>
                    </ul>

                </li>



                <li><a href="contact-us.html">Contact Us</a></li>

            </ul>
        </nav>

    </div>
</div>

.nav {width：100％; display：block;文本对齐：中心;背景色：＃313131;}

.nav_inner {height:100%; margin:0 auto; position:relative;text-align:center}


.nav_menu {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;

    line-height: 15px;

}

.nav_menu li {
    display:inline-block;
}

.nav_menu li a {
    display: block;
    color:#ffffff;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
}

.nav_menu a:hover {
    background-color: red;
    color:white;
}

.clearfix:after {
    display:block;
    clear:both;
}

/*----- Menu Outline -----*/
.menu-wrap {
    width:100%;
    background:#3e3436;
}

.menu {
    margin:0px auto;
}


.menu li {
    margin:0px;
    list-style:none;
}

.menu a {
    color:#ffffff;
    text-decoration:none;
}

.menu li:hover > a, .menu .current-item > a {
    text-decoration:none;
    color:#ffffff;
}

.menu .arrow {
    font-size:12px;
    line-height:0%;
    color:#00AAFF;  
    padding-left: 5px;
}
 .navs {
    float: left;
    width: 100%;
}
/*----- Top Level -----*/
.menu > ul > li {

    display:inline-block;
    position:relative;
    font-size:16px;
    color: #ffffff;
}

.menu > ul > li > a {
    padding:9px 40px;
    display:inline-block;
}

.menu > ul > li:hover > a, .menu > ul > .current-item > a {
    background:#191919;
}

/*----- Bottom Level -----*/
.menu li:hover .sub-menu {
    z-index:1;
    opacity:1;
}

.sub-menu {
    width:160%;
    padding:5px 0px;
    position:absolute;
    top:95%;
    left:0px;
    z-index:-1;
    opacity:0;
    transition:opacity linear 0.15s;
    background:#313131;
}

.sub-menu li {
    display:block;
    font-size:16px;
}

.sub-menu li a {
    padding:10px 30px;
    display:block;
}

.sub-menu li a:hover, .sub-menu .current-item a {
    background:#191919;
}