平常在网页中,经常会有空心箭头,除了用图片外,可以用css来实现。基本思路是,用css绘制两个三角形,通过绝对定位让两三角形不完全重叠,例如制作向右的空心箭头,位于前面的三角形border颜色是需要的颜色,后面的三角形border颜色与包裹它们的div背景色一致,然后设置前面三角形的left值比后者的left多1px,这样就可容易生成空心箭头,但是在ie8以下浏览器中,需要设置父元素和子元素的优先级,否则制作的三角形无法显示。下面是使用css模拟空心箭头的实现代码,如果有错误或不完善的地方,欢迎指正。
代码:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>css制作空心的上下左右的箭头</title>
<style type="text/css">
*{
padding:0;
margin:0;
}
.box{
width:100px;
height:500px;
margin:0 auto;
border:1px solid red;
background:white;
}
.arrow-box{
width:30px;
height:30px;
margin:20px auto;
position:relative;
}
/*右箭头*/
.right{
width:20px;
height:20px;
position:absolute;
left:0;
top:0;
border:1px solid blue;
}
.right-arrow1,.right-arrow2{
width:0;
height:0;
display:block;
position:absolute;
left:0;
top:0;
border-top:10px transparent dashed;
border-right:10px transparent dashed;
border-bottom:10px transparent dashed;
border-left:10px white solid;
overflow:hidden;
}
.right-arrow1{
left:1px;/*重要*/
border-left:10px blue solid;
}
.right-arrow2{
border-left:10px white solid;
}
/*左箭头*/
.left{
width:20px;
height:20px;
position:absolute;
left:0;
top:0;
z-index: 2;/*兼容ie8-*/
border:1px solid blue;
}
.left-arrow1,.left-arrow2{
width:0;
height:0;
display:block;
position:absolute;
left:0;
top:0;
z-index:5;/*兼容ie8-*/
border-top:10px transparent dashed;
border-left:10px transparent dashed;
border-bottom:10px transparent dashed;
border-right:10px white solid;
overflow:hidden;
}
.left-arrow1{
border-right:10px blue solid;
}
.left-arrow2{
left:1px;/*重要*/
border-right:10px white solid;
}
/*上箭头*/
.top{
width:20px;
height:20px;
position:absolute;
left:0;
top:0;
z-index: 2;/*兼容ie8-*/
border:1px solid blue;
}
.top-arrow1,.top-arrow2{
width:0;
height:0;
display:block;
position:absolute;
left:0;
top:0;
z-index: 5;/*兼容ie8-*/
border-top:10px transparent dashed;
border-left:10px transparent dashed;
border-right:10px transparent dashed;
border-bottom:10px white solid;
overflow:hidden;
}
.top-arrow1{
border-bottom:10px blue solid;
}
.top-arrow2{
top:1px;/*重要*/
border-bottom:10px white solid;
}
/*下箭头*/
.bottom{
width:20px;
height:20px;
position:absolute;
left:0;
top:0;
z-index: 2;/*兼容ie8-*/
border:1px solid blue;
}
.bottom-arrow1,.bottom-arrow2{
width:0;
height:0;
display:block;
position:absolute;
left:0;
top:0;
z-index: 5;/*兼容ie8-*/
border-bottom:10px transparent dashed;
border-left:10px transparent dashed;
border-right:10px transparent dashed;
border-top:10px white solid;
overflow:hidden;
}
.bottom-arrow1{
top:1px;/*重要*/
border-top:10px blue solid;
}
.bottom-arrow2{
border-top:10px white solid;
}
</style> <body>
<div class="box">
<p> 右箭头</p>
<div class="arrow-right arrow-box">
<b class="right"><i class="right-arrow1"></i><i class="right-arrow2"></i></b>
</div>
<p> 左箭头</p>
<div class="arrow-left arrow-box" >
<b class="left"><i class="left-arrow1"></i><i class="left-arrow2"></i></b>
</div>
<p> 上箭头</p>
<div class="arrow-top arrow-box" >
<b class="top"><i class="top-arrow1"></i><i class="top-arrow2"></i></b>
</div>
<p> 下箭头</p>
<div class="arrow-bottom arrow-box" >
<b class="bottom"><i class="bottom-arrow1"></i><i class="bottom-arrow2"></i></b>
</div>
</div>
</body>
</html>
效果如下:
经测试,Chrome,FF,以及IE6+均正常。