这个案例是由@猫仔同学提供的。最大的亮点就是使用了CSS3制作了卷边效果，配上js的移动效果，真是与众不同。在这个demo中主要运用了border-radius制作卷边效果，使用gradient实现了导航的渐变效果，而且还使用了border绘制了向上的箭头，同时给箭头配上了一个css3的动画效果。真的不错哟。
HTML 结构
<div class="notice"><div class="arrow"></div>拖动书角看看 *^_^*</div>
<div class="form" id="form">
<div class="corner" id="corner"></div>
<ul class="button">
<li><a href="">W3cplus</a></li>
<li><a href="">Blog</a></li>
<li class="navcurrent"><a href="">About Us</a></li>
<li class="borderno"><a href="">Contact</a></li>
</ul>
</div>
CSS代码：
ul,li{
list-style-type:none;
padding:0;
}
.form{
width:405px;
height:200px;
background:#2f2f2f;
position:relative;
overflow:hidden;
margin:30px auto;
}
.corner{
background: -webkit-linear-gradient(45deg, #2e2e2e 24%, #5F5F5F 40%,#6f6f6f 43%,#5F5F5F 46%,#2F2F2F 50%,#fff 50%,#fff);
background: -moz-linear-gradient(45deg, #2e2e2e 24%, #5F5F5F 40%,#6f6f6f 43%,#5F5F5F 46%,#2F2F2F 50%,#fff 50%,#fff);height: 90px;
background: -o-linear-gradient(45deg, #2e2e2e 24%, #5F5F5F 40%,#6f6f6f 43%,#5F5F5F 46%,#2F2F2F 50%,#fff 50%,#fff);height: 90px;
background: -ms-linear-gradient(45deg, #2e2e2e 24%, #5F5F5F 40%,#6f6f6f 43%,#5F5F5F 46%,#2F2F2F 50%,#fff 50%,#fff);height: 90px;
background: linear-gradient(45deg, #2e2e2e 24%, #5F5F5F 40%,#6f6f6f 43%,#5F5F5F 46%,#2F2F2F 50%,#fff 50%,#fff);height: 90px;
width: 90px;
height:90px;
border-radius: 0 0 0px 90px / 0 0 0 30px;
-webkit-transform: rotate(-90deg);
-moz-transform: rotate(-90deg);
-o-transform: rotate(-90deg);
-ms-transform: rotate(-90deg);
transform: rotate(-90deg);
position: absolute;
left:-4px;
top: -4px;
box-shadow: 5px 2px 8px black;
overflow:hidden;
-webkit-transition:all 0.3s linear 0s;
-moz-transition:all 0.3s linear 0s;
-o-transition:all 0.3s linear 0s;
-ms-transition:all 0.3s linear 0s;
transition:all 0.3s linear 0s;
}
.corner:after{
height:100%;
width:100%;
position: absolute;
content: "";
top: -15px;
left: -82px;
border-radius: 90px 90px 0px 0 / 40px 40px 0 0;
z-index: 1;
background: #2F2F2F;
-webkit-transform: rotate(77deg);
-moz-transform: rotate(77deg);
-o-transform: rotate(77deg);
-ms-transform: rotate(77deg);
transform: rotate(77deg);
box-shadow: 0px 0px 8px black inset;
}
.button{
float: left;
height:40px;
margin:20px 20px;
border-radius:30px;
border:1px solid #151515;
box-shadow:0px 2px 2px rgba(0,0,0,0.6);
overflow:hidden;
}
.button li {
float: left;
}
.button li a{
float:left;
display:block;
text-decoration:none;
padding: 0 20px;
height:40px;
line-height:36px;
font-size:14px;
color:#eee;
text-align:center;
border-right:1px solid #151515;
box-shadow:-1px 0px 0px rgba(255,255,255,0.1) inset,inset 0px -1px 1px rgba(200,200,200,0.1),inset 0px 1px 2px rgba(255,255,255,0.1);
text-shadow:0px -1px 0px #000;
background:-webkit-linear-gradient(top,rgba(200,200,200,0.1) 0%,rgba(200,200,200,0.1) 50%,#222 50%,#222);
background:-moz-linear-gradient(top,rgba(200,200,200,0.1) 0%,rgba(200,200,200,0.1) 50%,#222 50%,#222);
background:-o-linear-gradient(top,rgba(200,200,200,0.1) 0%,rgba(200,200,200,0.1) 50%,#222 50%,#222);
background:-ms-linear-gradient(top,rgba(200,200,200,0.1) 0%,rgba(200,200,200,0.1) 50%,#222 50%,#222);
background:linear-gradient(top,rgba(200,200,200,0.1) 0%,rgba(200,200,200,0.1) 50%,#222 50%,#222);
}
.button li:first-child a{
border-radius:30px 0 0 30px;
}
.button li:last-child a{
border-radius:0px 30px 30px 0;
border-right: none;
}
.button li a:hover{
cursor:pointer;
background:-webkit-linear-gradient(top,rgba(50,50,50,0.4) 20%,rgba(100,100,100,0.3));
background:-moz-linear-gradient(top,rgba(50,50,50,0.4) 20%,rgba(100,100,100,0.3));
background:-o-linear-gradient(top,rgba(50,50,50,0.4) 20%,rgba(100,100,100,0.3));
background:-ms-linear-gradient(top,rgba(50,50,50,0.4) 20%,rgba(100,100,100,0.3));
background:linear-gradient(top,rgba(50,50,50,0.4) 20%,rgba(100,100,100,0.3));
box-shadow:0px 2px 4px rgba(0,0,0,0.8) inset;
color:#b7def5;
text-shadow:0px 0px 8px rgba(0,162,255,0.8);
}
.notice{
position:relative;
padding:10px 0 0 25px;
margin: 20px auto;
width: 120px;
}
.arrow{
width:13px;
height:20px;
background:#FC9;
position:absolute;
top:0px;
left:0px;
-webkit-animation:notices linear 0.8s infinite ;
-moz-animation:notices linear 0.8s infinite ;
-o-animation:notices linear 0.8s infinite ;
-ms-animation:notices linear 0.8s infinite ;
animation:notices linear 0.8s infinite ;
}
.arrow:after{
width:0;
height:0;
border-width:12px;
border-style:solid dashed dashed dashed;
border-color:#FC9 transparent transparent transparent;
position:absolute;
bottom:-22px;
left:-5px;
display:block;
content:"";
}
@-webkit-keyframes notices{
0%{top:0px;}
50%{top:10px;}
100%{top:0px;}
}
@-moz-keyframes notices{
0%{top:0px;}
50%{top:10px;}
100%{top:0px;}
}
@-o-keyframes notices{
0%{top:0px;}
50%{top:10px;}
100%{top:0px;}
}
@-ms-keyframes notices{
0%{top:0px;}
50%{top:10px;}
100%{top:0px;}
}
@keyframes notices{
0%{top:0px;}
50%{top:10px;}
100%{top:0px;}
}
JavaScript代码
(function(){
var form=document.getElementById("form");
var corner=document.getElementById("corner")
var ftop=form.offsetTop;
var fleft=form.offsetLeft;
var switchopen=0;
corner.onmousedown=function(e){
e.preventDefault();
form.style.cursor="move";
switchopen=1;
}
form.onmousemove=function(e){
if(switchopen==1){
if(e.pageX-fleft>90 ||e.pageY-ftop>90){
corner.style.width=corner.style.height=90+"px";
corner.style.left=corner.style.top=-4+"px"
}
else{
corner.style.width=corner.style.height=e.pageY-ftop+"px";
}
}
}
form.onmouseup=function(){
switchopen=0;
this.style.cursor="default";
}
})()
如需转载烦请注明出处：http://www.w3cplus.com/demo/filed-corner-menu.html