<h1>如何绘制CSS三角形</h1>
<div id="whole-thing">
<div class="steps">
<div class="step-0">这是一个盒子</div>
<div class="step-1">它有一个顶部边框(border-top)</div>
<div class="step-2">当然它也有其它的边框</div>
<div class="step-5">注意各边框之间是以怎样的角度连接的</div>
<div class="step-6">盒子的背景色为透明</div>
<div class="step-7">盒子的高度和宽度都是0</div>
<div class="step-8">其中的三条边框都以透明为底色</div>
<div class="step-11">于是我们就得到了一个CSS三角形</div>
</div>
<div class="triangle-demo"></div>
<div class="triangle-title">
<button id="re-run">再看一遍</button>
</div>
</div>.triangle-demo {
width: 100px;
height: 100px;
margin: 0 auto;
background: tan;
border-top: 0 solid #EE7C31;
border-left: 0 solid #F5D97B;
border-bottom: 0 solid #D94948;
border-right: 0 solid #8DB434;
transition: 0.8s 0.2s;
}
.step-1 .triangle-demo {
border-top-width: 10px;
}
.step-2 .triangle-demo {
border-left-width: 10px;
}
.step-3 .triangle-demo {
border-right-width: 10px;
}
.step-4 .triangle-demo {
border-bottom-width: 10px;
}
.step-6 .triangle-demo {
background: transparent;
}
.step-7 .triangle-demo {
width: 0;
height: 0;
}
.step-8 .triangle-demo {
border-left-color: transparent;
}
.step-9 .triangle-demo {
border-right-color: transparent;
}
.step-10 .triangle-demo {
border-top-color: transparent;
}
.triangle-title {
width: 300px;
padding: 1rem;
color: white;
background: #D94948;
border-radius: 20px;
margin: auto;
opacity: 0;
transition: 0.8s 0.2s;
}
.step-11 .triangle-title {
opacity: 1;
}
body {
background: #333;
color: white;
text-align: center;
font-size: large;
transform: translateZ(0);
}
.steps {
position: relative;
height: 45px;
}
.steps > div {
position: absolute;
top: 0;
left: 0;
width: 100%;
opacity: 0;
background: #333;
transition: 0.3s;
}
.steps .step-0 {
opacity: 1;
}
.step-1 .steps .step-1 {
opacity: 1;
}
.step-2 .steps .step-2 {
opacity: 1;
}
.step-5 .steps .step-5 {
opacity: 1;
}
.step-6 .steps .step-6 {
opacity: 1;
}
.step-7 .steps .step-7 {
opacity: 1;
}
.step-8 .steps .step-8 {
opacity: 1;
}
.step-11 .steps .step-11 {
opacity: 1;
}
h1 {
text-transform: uppercase;
letter-spacing: 1px;
font-size: 1.5rem;
border-bottom: 1px solid #555;
color: #999;
}
(function () {
var demo, run;
demo = $('#whole-thing');
run = function () {
setTimeout(function () {
return demo.addClass('step-1');
}, 2500);
setTimeout(function () {
return demo.addClass('step-2');
}, 5000);
setTimeout(function () {
return demo.addClass('step-3');
}, 5500);
setTimeout(function () {
return demo.addClass('step-4');
}, 6000);
setTimeout(function () {
return demo.addClass('step-5');
}, 7500);
setTimeout(function () {
return demo.addClass('step-6');
}, 10000);
setTimeout(function () {
return demo.addClass('step-7');
}, 12000);
setTimeout(function () {
return demo.addClass('step-8');
}, 14000);
setTimeout(function () {
return demo.addClass('step-9');
}, 14500);
setTimeout(function () {
return demo.addClass('step-10');
}, 15000);
return setTimeout(function () {
return demo.addClass('step-11');
}, 18000);
};
run();
$('#re-run').on('click', function () {
$('#whole-thing').removeClass();
return run();
});
}.call(this));
External CSS
This Pen doesn't use any external CSS resources.