HTML、CSS、JavaScript 实现下拉菜单效果

​x
 
<!doctype html>
<html>
​
    <head>
    
        <meta charset="UTF-8" />
        <title>Arrowination</title>
        <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.3.0/css/font-awesome.min.css" />
    
    </head>
    
    <body>
    
        <div class="section">
        
            <div class="title">
        
        click here
      
      </div>
            
            <div class="body">
            
                <h2>Just look at the arrow above</h2>
                
                Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. 
                
                <br/>
                <br/>
                
                <span>Crafted by: <a href="http://linkedin.com/in/mrReiha">Reiha Hosseini</a></span>
            
            </div>
        
        </div>
    
        <div class="section">
        
            <div class="title">
            
                click here
            
            </div>
            
            <div class="body">
            
                <h2>Just look at the arrow above</h2>
                
                Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. 
                
                <br/>
                <br/>
                
                <span>Crafted by: <a href="http://linkedin.com/in/mrReiha">Reiha Hosseini</a></span>
            
            </div>
        
        </div>
    
        <div class="section">
        
            <div class="title">
            
                click here
            
            </div>
            
            <div class="body">
            
                <h2>Just look at the arrow above</h2>
                
                Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. 
                
                <br/>
                <br/>
                
                <span>Crafted by: <a href="http://linkedin.com/in/mrReiha">Reiha Hosseini</a></span>
            
            </div>
        
        </div>
    
    </body>
​
</html>

HTML

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/**
 * ---------------------------------------------
 * Javscript is just for make elements clickable
 * Effects are on the css only
 * ---------------------------------------------
 * @since 2015/06/10
 * @author Reiha Hosseini ( @mrReiha )
 */
;!( function( w, d ) {
​
  'use strict';
  
    var titles = d.querySelectorAll( '.title' ),
        
        i = 0,
        len = titles.length;
        
    for ( ; i < len; i++ )
        titles[ i ].onclick = function( e ) {
        
            for ( var j = 0; j < len; j++ )
                if ( this != titles[ j ] )
                    titles[ j ].parentNode.className = titles[ j ].parentNode.className.replace( / open/i, '' );
        
            var cn = this.parentNode.className;
        
            this.parentNode.className = ~cn.search( /open/i ) ? cn.replace( / open/i, '' ) : cn + ' open';
        
        };
​
})( this, document );

JavaScript

xxxxxxxxxx
 
/**
 * ---------------------------------------------
 * Best result is on FireFox ( of course! :D )
 * ---------------------------------------------
 */
@font-face {
  font-family: 'Merriweather Sans';
  font-style: italic;
  font-weight: 800;
  src: local('Merriweather Sans ExtraBold Italic'), local('MerriweatherSans-ExtraBldItalic'), url(http://fonts.gstatic.com/s/merriweathersans/v5/nAqt4hiqwq3tzCecpgPmVfrUSW10CwTuVx9PepRx9ls.woff2) format('woff2'), url(http://fonts.gstatic.com/s/merriweathersans/v5/nAqt4hiqwq3tzCecpgPmVW2xy75WLVt7UI7Cycabsy8.woff) format('woff');
}
​
@font-face {
    font-family: "open";
    font-style: normal;
    font-weight: 300;
    src: local( "Open Sans Light" ), local( "OpenSans-Light" ), 
        url( https://themes.googleusercontent.com/static/fonts/opensans/v6/DXI1ORHCpsQm3Vp6mXoaTZ1r3JsPcQLi8jytr04NNhU.woff ) format( 'woff' );
}
​
*, *:before, *:after {
    -moz-box-sizing: border-box;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
}
​
a {
    color: inherit;
    text-decoration: none;
}
​
h1, h2, h3 {
    margin: 0;
    font-weight: normal;
}
​
html, body {
    padding: 0;
    margin: 0;
    background: #eee;
}
​
body {
    padding-top: 80px;
}
​
.section {
    width: 400px;
    margin: 7px auto;
    height: 69px;
    box-shadow: 0 1px 2px rgba( 0, 0, 0, .2 );
    overflow: hidden;
    -webkit-transition: .35s;
    transition: .35s;
}
​
.title {
    padding: 20px;
    padding-top: 24px;
    background: #00C37E;
    color: #fff;
    cursor: pointer;
    text-shadow: 0 1px 0 #666;
    width: 100%;
    text-transform: capitalize;
    font-family: 'Merriweather Sans', sans-serif;
  font-style: italic;
    position: relative;
    -moz-user-select: none;
    -ms-user-select: none;
    -webkit-user-select: none;
    user-select: none;
    z-index: 10;
}
​
.title:before, .title:after {
    content: "";
    display: block;
    position: absolute;
    right: 20px;
    top: 21px;
  font-style: normal;
    height: 21px;
  line-height: 1;
    overflow: hidden;
    font-family: FontAwesome;
    font-size: 20px;
    background: #00C37E;
    -webkit-transition: .35s;
    transition: .35s;
}
​
.title:before {
    z-index: 2;
}
.title:after {
    top: 25px;
    -webkit-transform: rotate( 180deg );
    -ms-transform: rotate( 180deg );
    -moz-transform: rotate( 180deg );
    transform: rotate( 180deg );
}
​
.open .title:before {
    height: 0;
}
​
.body {
    font: 16px open, sans-serif;
    background: #fff;
    padding: 20px 20px 40px;
    color: #777;
    -moz-transform: translateY( -100% );
    -ms-transform: translateY( -100% );
    -webkit-transform: translateY( -100% );
    transform: translateY( -100% );
    overflow: hidden;
    -webkit-transition: .35s;
    transition: .35s;
}
    .body h2 {
        color: #333;
        font-size: 22px;
        margin-bottom: 10px;
    }
    .body h2:before {
        content: '▪';
        padding-right: 7px;
        color: #00C37E;
    }
    .body a {
        color: #00C37E;
    }
    .body span {
        font-size: 12px;
    }
    
.section.open {
    height: 288px;
}
.open .body {
    -webkit-transform: none;
    -ms-transform: none;
    -moz-transform: none;
    transform: none;
}

CSS