# makeIcon

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# 伪元素

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伪元素是一个附加至选择器末的关键词，允许你对被选择元素的特定部分修改样式。伪元素主要有：
(伪元素可以解释为元素的修饰，可以为元素带来额外的附加样式，属于额外的文档结构。)

::first-letter 第一个字母的样式
::first-line 首行文字的样式
::before 元素头部添加的修饰
::after 元素尾部添加的修饰
::placeholder input的占位符样式
::selection 被选中元素的样式

# 伪类

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用来表示无法在CSS中轻松或者可靠检测到的某个元素的状态或属性，比如a标签的hover表示鼠标经过的样式，visited表示访问过的链接的样式，更多的用来描述元素状态变化时的样式，伪类主要有：

:link
:visited
:hover
:active
:focus
:lang(fr)
:not(s)
:root
:first-child
:last-child
:only-child
:nth-child(n)
:nth-last-child(n)
:first-of-type
:last-of-type
:only-of-type
:nth-of-type(n)
:nth-last-of-type(n)
:empty
:checked
:enabled
:disabled
:target

# 正文

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原理
实现箭头
实现搜索图标
实现头像

# 原理

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css图标是基于伪元素的，可以利用伪元素的::before和::after和content属性来为元素添加额外视觉效果，我们在上文中也介绍了伪元素的概念和类型

# 实现箭头

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利用元素的::before伪元素画一个三角形，用css设置span样式为一条线并进行布局定位

.arrow {
    position: relative;
    display: inline-block;
    line-height: 0;
    background-color: #ccc;
    &.arrow-hor {
        width: 16px;
        height: 1px;
    }
    &.arrow-hor.right::before {
        content: '';
        position: absolute;
        top: -4px;
        right: -8px;
        border: 4px solid transparent;
        border-left: 4px solid #ccc;
    }
}

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<span class="arrow arrow-hor right"></span>

# 实现搜索图标

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// less
.search {
    position: relative;
    display: inline-block;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: 1px solid #ccc;
    text-align: center;
    transform: rotate(-45deg);
    &::after {
        content: '';
        display: inline-block;
        width: 1px;
        height: 4px;
        background-color: #ccc;
    }
}
// html
<span class="search"></span>

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# 实现头像

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// less
.dot-pan {
    position: relative;
    display: inline-flex;
    width: 60px;
    height: 60px;
    line-height: 0;
    align-items: center;
    border-radius: 50%;
    background-color: #06c;
    transform: rotate(-90deg);
    &::before {
        content: '';
        display: inline-block;
        width: 28px;
        height: 40px;
        margin-left: -3px;
        border-radius: 50% 50%;
        flex-shrink: 0;
        background-color: #fff;
    }

    &::after {
        content: '';
        display: inline-block;
        width: 20px;
        height: 20px;
        flex-shrink: 0;
        border-radius: 50%;
        background-color: #fff;
    }
}
// html
<span class="search"></span>

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# 实现地点图标

// less
.locate-icon {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: #06c;
    &::before {
        content: '';
        position: absolute;
        display: inline-block;
        width: 12px;
        height: 12px;
        border-radius: 50%;
        left: 50%;
        top: 50%;
        transform: translate(-50%, -50%);
        background-color: #fff;
    }
    &::after {
        content: '';
        margin-top: 45px;
        display: inline-block;
        border: 15px solid transparent;
        border-top-color: #06c;
    }
}
// html
<span class="locate-icon mr-20"></span>

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# 实现微信图标

// less
.wechat-icon {
    display: inline-block;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: rgb(68, 170, 59);
    &::before {
        content: '';
        margin-top: 14px;
        position: absolute;
        width: 4px;
        height: 4px;
        border-radius: 50%;
        background-color: #fff;
        box-shadow: 16px 0 0 #fff;
    }
    &::after {
        content: '';
        margin-top: 42px;
        display: inline-block;
        border-width: 6px 10px 6px 10px;
        border-style: solid;
        border-color: transparent;
        border-top-color: rgb(68, 170, 59);
        transform: rotate(-147deg);
    }
}
// html
<span class="wechat-icon mr-20"></span>

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# 实现对勾图标

// less
.yes-icon {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    width: 48px;
    height: 48px;
    background-color: green;
    border-radius: 50%;
    &::after {
        content: '✓';
        color: #fff;
        font-size: 30px;
        font-weight: bold;
    }
}
// html
<span class="yes-icon mr-20"></span>

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# 实现眼睛（一般用于网站访问量图标）

主要是做椭圆加上一个圆形的伪元素：

.view-icon {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    width: 58px;
    height: 36px;
    background-color: #06c;
    border-radius: 50%;
    &::after {
        content: '';
        display: inline-block;
        width: 20px;
        height: 20px;
        border-radius: 50%;
        background-color: #fff;
    }
}

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# 导航图标

主要思想是画两个三较形，用伪元素的三角形遮住主元素底部即可

.gps-icon {
    position: relative;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    border-width: 30px 15px 30px 15px;
    border-color: transparent;
    border-style: solid;
    border-bottom-color: #06c;
    transform: translate(10px, -16px) rotate(32deg);
    &::after {
        position: absolute;
        bottom: -48px;
        content: '';
        display: inline-block;
        border-width: 10px 38px 30px 38px;
        border-color: transparent;
        border-style: solid;
        border-bottom-color: #fff;
    }
}

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# 实现心形图标

用两个伪元素实现两个椭圆，旋转重合即可

.logo-x {
    position: relative;
    display: inline-flex;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: rgb(212, 73, 17);
    &::after {
        position: absolute;
        content: '';
        left: 10px;
        top: 12px;
        display: inline-block;
        width: 20px;
        height: 30px;
        border-radius: 50%;
        background-color: #fff;
        transform: rotate(135deg);
    }
    &::before {
        position: absolute;
        content: '';
        right: 10px;
        top: 12px;
        display: inline-block;
        width: 20px;
        height: 30px;
        border-radius: 50%;
        background-color: #fff;
        transform: rotate(-135deg);
    }
}

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# ps图标

一个伪元素用来做文字图形，一个用来做遮罩，来形成伪立体感

.logo-ps {
    position: relative;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    width: 50px;
    height: 50px;
    border-radius: 8px;
    background-color: rgb(15, 102, 184);
    &::before {
        position: absolute;
        content: '';
        display: inline-block;
        width: 50px;
        height: 40px;
        background-color: rgba(255, 255, 255, .1);
    }
    &::after {
        position: absolute;
        content: 'PS';
        font-size: 24px;
        display: inline-block;
        color: #fff;
    }
}

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