腾讯的CSS/SCSS代码规范

每次打开都要等好久，干脆写出来给自己看= =

参考链接：http://alloyteam.github.io/CodeGuide/

1、空格

不需要空格

• 属性名后
• 多个规则的分隔符‘,’前
• !important ‘!’后
• 属性值中’(‘后和’)'前
• 行末不要有多余的空格

需要空格

• 属性值前
• 选择器‘>’, ‘+’, ‘~’前后
• ‘{’前
• !important ‘!’前
• @else 前后
• 属性值中的‘,’后
• 注释‘ /* ’后和 ‘ */ ’前

/* good */
.element > .dialog,
.element {
color: red !important;
background-color: rgba(0, 0, 0, .5);
}
@if {
...
} @else {
...
}

2、空行和换行

直接看例子吧= =

/* good */
.dialog,
.element {
...
}

.dialog {
color: red;
/* 属性之间需要适当的空行，具体见6、属性声明顺序 */

&:after {
...
}
}

3、注释

还是看代码

/* 注释统一用'/ * * /'（scss中也不要用'//'） */
.modal-header {
...
}

/*
* Modal header
*/
.modal-header {
...
}

.modal-header {
/* 缩进与下一行代码保持一致 */
width: 50px;

color: red; /* 可位于一个代码行的末尾，与代码间隔一个空格 */
}

4、引号

代码……

.element:after {
content: ""; /* 最外层统一使用双引号 */
background-image: url("logo.png"); /* url的内容要用引号 */
}

/* 属性选择器中的属性值需要引号 */
li[data-type="single"] {
...
}

5、命名

/* class类名使用小写字母，以中划线分隔 */
.element-content {
...
}

/* idid采用驼峰式命名 */
#myDialog {
...
}

/* scss中的变量、函数、混合、placeholder采用驼峰式命名 */
/* 变量 */
$colorBlack: #000;

/* 函数 */
@function pxToRem($px) {
...
}

/* 混合 */
@mixin centerBlock {
...
}

/* placeholder */
%myDialog {
...
}

6、属性声明顺序

文末有推荐的属性的顺序

.declaration-order {
display: block;
float: right;

position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
z-index: 100;

border: 1px solid #e5e5e5;
border-radius: 3px;
width: 100px;
height: 100px;

font: normal 13px "Helvetica Neue", sans-serif;
line-height: 1.5;
text-align: center;

color: #333;
background-color: #f5f5f5;

opacity: 1;
}

7、颜色

简写以及小写

.element {
color: #abcdef;
background-color: #012; /* #001122 */
}

8、简写

属性简写需要你非常清楚属性值的正确顺序，而且在大多数情况下并不需要设置属性简写中包含的所有值，所以建议尽量分开声明会更加清晰

注：margin 和 padding 相反，需要使用简写

9、媒体查询

尽量将媒体查询的规则靠近与他们相关的规则

10、SCSS相关

提交的代码中不要有 @debug；

声明顺序：

• @extend
• 不包含 @content 的 @include
• 包含 @content 的 @include
• 自身属性
• 嵌套规则
• @import 引入的文件不需要开头的’_‘和结尾的’.scss’；

嵌套最多不能超过5层；

@extend 中使用placeholder选择器；

去掉不必要的父级引用符号’&’。

/* not good */
@import "_dialog.scss";

/* good */
@import "dialog";

/* not good */
.fatal {
@extend .error;
}

/* good */
.fatal {
@extend %error;
}

/* not good */
.element {
& > .dialog {
...
}
}

/* good */
.element {
> .dialog {
...
}
}

11、杂项

• 不允许有空的规则

• 元素选择器用小写字母

• 去掉小数点前面的0

• 去掉数字中不必要的小数点和末尾的0

• 属性值’0’后面不要加单位

• 同个属性不同前缀的写法需要在垂直方向保持对齐，具体参照右边的写法

• 无前缀的标准属性应该写在有前缀的属性后面

• 不要在同个规则里出现重复的属性，如果重复的属性是连续的则没关系

• 不要在一个文件里出现两个相同的规则

• 用 border: 0; 代替 border: none;

• 选择器不要超过4层（在scss中如果超过4层应该考虑用嵌套的方式来写）

• 发布的代码中不要有 @import

• 尽量少用’*'选择器

/* 元素选择器用小写字母 */
li {
color: rgba(0, 0, 0, .5); /* 去掉小数点前面的0 */
...
}

.element {
width: 0; /* 属性值'0'后面不要加单位 */
}

/*
*同个属性不同前缀的写法需要在垂直方向保持对齐，具体参照右边的写法
*无前缀的标准属性应该写在有前缀的属性后面
*/
.element {
-webkit-border-radius: 3px;
-moz-border-radius: 3px;
border-radius: 3px;

background: -webkit-linear-gradient(top, #fff 0, #eee 100%);
background:    -moz-linear-gradient(top, #fff 0, #eee 100%);
background:         linear-gradient(to bottom, #fff 0, #eee 100%);
}

没了

下面是推荐的属性的顺序

[
[
"display",
"visibility",
"float",
"clear",
"overflow",
"overflow-x",
"overflow-y",
"clip",
"zoom"
],
[
"table-layout",
"empty-cells",
"caption-side",
"border-spacing",
"border-collapse",
"list-style",
"list-style-position",
"list-style-type",
"list-style-image"
],
[
"-webkit-box-orient",
"-webkit-box-direction",
"-webkit-box-decoration-break",
"-webkit-box-pack",
"-webkit-box-align",
"-webkit-box-flex"
],
[
"position",
"top",
"right",
"bottom",
"left",
"z-index"
],
[
"margin",
"margin-top",
"margin-right",
"margin-bottom",
"margin-left",
"-webkit-box-sizing",
"-moz-box-sizing",
"box-sizing",
"border",
"border-width",
"border-style",
"border-color",
"border-top",
"border-top-width",
"border-top-style",
"border-top-color",
"border-right",
"border-right-width",
"border-right-style",
"border-right-color",
"border-bottom",
"border-bottom-width",
"border-bottom-style",
"border-bottom-color",
"border-left",
"border-left-width",
"border-left-style",
"border-left-color",
"-webkit-border-radius",
"-moz-border-radius",
"border-radius",
"-webkit-border-top-left-radius",
"-moz-border-radius-topleft",
"border-top-left-radius",
"-webkit-border-top-right-radius",
"-moz-border-radius-topright",
"border-top-right-radius",
"-webkit-border-bottom-right-radius",
"-moz-border-radius-bottomright",
"border-bottom-right-radius",
"-webkit-border-bottom-left-radius",
"-moz-border-radius-bottomleft",
"border-bottom-left-radius",
"-webkit-border-image",
"-moz-border-image",
"-o-border-image",
"border-image",
"-webkit-border-image-source",
"-moz-border-image-source",
"-o-border-image-source",
"border-image-source",
"-webkit-border-image-slice",
"-moz-border-image-slice",
"-o-border-image-slice",
"border-image-slice",
"-webkit-border-image-width",
"-moz-border-image-width",
"-o-border-image-width",
"border-image-width",
"-webkit-border-image-outset",
"-moz-border-image-outset",
"-o-border-image-outset",
"border-image-outset",
"-webkit-border-image-repeat",
"-moz-border-image-repeat",
"-o-border-image-repeat",
"border-image-repeat",
"padding",
"padding-top",
"padding-right",
"padding-bottom",
"padding-left",
"width",
"min-width",
"max-width",
"height",
"min-height",
"max-height"
],
[
"font",
"font-family",
"font-size",
"font-weight",
"font-style",
"font-variant",
"font-size-adjust",
"font-stretch",
"font-effect",
"font-emphasize",
"font-emphasize-position",
"font-emphasize-style",
"font-smooth",
"line-height",
"text-align",
"-webkit-text-align-last",
"-moz-text-align-last",
"-ms-text-align-last",
"text-align-last",
"vertical-align",
"white-space",
"text-decoration",
"text-emphasis",
"text-emphasis-color",
"text-emphasis-style",
"text-emphasis-position",
"text-indent",
"-ms-text-justify",
"text-justify",
"letter-spacing",
"word-spacing",
"-ms-writing-mode",
"text-outline",
"text-transform",
"text-wrap",
"-ms-text-overflow",
"text-overflow",
"text-overflow-ellipsis",
"text-overflow-mode",
"-ms-word-wrap",
"word-wrap",
"-ms-word-break",
"word-break"
],
[
"color",
"background",
"filter:progid:DXImageTransform.Microsoft.AlphaImageLoader",
"background-color",
"background-image",
"background-repeat",
"background-attachment",
"background-position",
"-ms-background-position-x",
"background-position-x",
"-ms-background-position-y",
"background-position-y",
"-webkit-background-clip",
"-moz-background-clip",
"background-clip",
"background-origin",
"-webkit-background-size",
"-moz-background-size",
"-o-background-size",
"background-size"
],
[
"outline",
"outline-width",
"outline-style",
"outline-color",
"outline-offset",
"opacity",
"filter:progid:DXImageTransform.Microsoft.Alpha(Opacity",
"-ms-filter:\\'progid:DXImageTransform.Microsoft.Alpha",
"-ms-interpolation-mode",
"-webkit-box-shadow",
"-moz-box-shadow",
"box-shadow",
"filter:progid:DXImageTransform.Microsoft.gradient",
"-ms-filter:\\'progid:DXImageTransform.Microsoft.gradient",
"text-shadow"
],
[
"-webkit-transition",
"-moz-transition",
"-ms-transition",
"-o-transition",
"transition",
"-webkit-transition-delay",
"-moz-transition-delay",
"-ms-transition-delay",
"-o-transition-delay",
"transition-delay",
"-webkit-transition-timing-function",
"-moz-transition-timing-function",
"-ms-transition-timing-function",
"-o-transition-timing-function",
"transition-timing-function",
"-webkit-transition-duration",
"-moz-transition-duration",
"-ms-transition-duration",
"-o-transition-duration",
"transition-duration",
"-webkit-transition-property",
"-moz-transition-property",
"-ms-transition-property",
"-o-transition-property",
"transition-property",
"-webkit-transform",
"-moz-transform",
"-ms-transform",
"-o-transform",
"transform",
"-webkit-transform-origin",
"-moz-transform-origin",
"-ms-transform-origin",
"-o-transform-origin",
"transform-origin",
"-webkit-animation",
"-moz-animation",
"-ms-animation",
"-o-animation",
"animation",
"-webkit-animation-name",
"-moz-animation-name",
"-ms-animation-name",
"-o-animation-name",
"animation-name",
"-webkit-animation-duration",
"-moz-animation-duration",
"-ms-animation-duration",
"-o-animation-duration",
"animation-duration",
"-webkit-animation-play-state",
"-moz-animation-play-state",
"-ms-animation-play-state",
"-o-animation-play-state",
"animation-play-state",
"-webkit-animation-timing-function",
"-moz-animation-timing-function",
"-ms-animation-timing-function",
"-o-animation-timing-function",
"animation-timing-function",
"-webkit-animation-delay",
"-moz-animation-delay",
"-ms-animation-delay",
"-o-animation-delay",
"animation-delay",
"-webkit-animation-iteration-count",
"-moz-animation-iteration-count",
"-ms-animation-iteration-count",
"-o-animation-iteration-count",
"animation-iteration-count",
"-webkit-animation-direction",
"-moz-animation-direction",
"-ms-animation-direction",
"-o-animation-direction",
"animation-direction"
],
[
"content",
"quotes",
"counter-reset",
"counter-increment",
"resize",
"cursor",
"-webkit-user-select",
"-moz-user-select",
"-ms-user-select",
"user-select",
"nav-index",
"nav-up",
"nav-right",
"nav-down",
"nav-left",
"-moz-tab-size",
"-o-tab-size",
"tab-size",
"-webkit-hyphens",
"-moz-hyphens",
"hyphens",
"pointer-events"
]
]