用css制作空心箭头(上下左右各个方向均有)
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。