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## 缩进 使用soft tab(4个空格)。 ~~~ .element { position: absolute; top: 10px; left: 10px; border-radius: 10px; width: 50px; height: 50px; } ~~~ ## 分号 每个属性声明末尾都要加分号。 ~~~ .element { width: 20px; height: 20px; background-color: red; } ~~~ ## 空格 以下几种情况不需要空格: * 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 以下几种情况需要空格: * 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 ~~~ /* not good */ .element { color :red! important; background-color: rgba(0,0,0,.5); } /* good */ .element { color: red !important; background-color: rgba(0, 0, 0, .5); } /* not good */ .element , .dialog{ ... } /* good */ .element, .dialog { } /* not good */ .element>.dialog{ ... } /* good */ .element > .dialog{ ... } /* not good */ .element{ ... } /* good */ .element { ... } /* not good */ @if{ ... }@else{ ... } /* good */ @if { ... } @else { ... } ~~~ ## 空行 以下几种情况需要空行: * 文件最后保留一个空行 * '}'后最好跟一个空行,包括scss中嵌套的规则 * 属性之间需要适当的空行,具体见[属性声明顺序](http://alloyteam.github.io/CodeGuide/#css-declaration-order) ~~~ /* not good */ .element { ... } .dialog { color: red; &:after { ... } } /* good */ .element { ... } .dialog { color: red; &:after { ... } } ~~~ ## 换行 以下几种情况不需要换行: * '{'前 以下几种情况需要换行: * '{'后和'}'前 * 每个属性独占一行 * 多个规则的分隔符','后 ~~~ /* not good */ .element {color: red; background-color: black;} /* good */ .element { color: red; background-color: black; } /* not good */ .element, .dialog { ... } /* good */ .element, .dialog { ... } ~~~ ## 注释 注释统一用'/* */'(scss中也不要用'//'),具体参照右边的写法; 缩进与下一行代码保持一致; 可位于一个代码行的末尾,与代码间隔一个空格。 ~~~ /* Modal header */ .modal-header { ... } /* * Modal header */ .modal-header { ... } .modal-header { /* 50px */ width: 50px; color: red; /* color red */ } ~~~ ## 引号 最外层统一使用双引号; url的内容要用引号; 属性选择器中的属性值需要引号。 ~~~ .element:after { content: ""; background-image: url("logo.png"); } li[data-type="single"] { ... } ~~~ ## 命名 * 类名使用小写字母,以中划线分隔 * id采用驼峰式命名 * scss中的变量、函数、混合、placeholder采用驼峰式命名 ~~~ /* class */ .element-content { ... } /* id */ #myDialog { ... } /* 变量 */ $colorBlack: #000; /* 函数 */ @function pxToRem($px) { ... } /* 混合 */ @mixin centerBlock { ... } /* placeholder */ %myDialog { ... } ~~~ ## 属性声明顺序 相关的属性声明按右边的顺序做分组处理,组之间需要有一个空行。 ~~~ .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; } ~~~ ~~~ // 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" ] ] ~~~ ## 颜色 颜色16进制用小写字母; 颜色16进制尽量用简写。 ~~~ /* not good */ .element { color: #ABCDEF; background-color: #001122; } /* good */ .element { color: #abcdef; background-color: #012; } ~~~ ## 属性简写 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; `margin` 和 `padding` 相反,需要使用简写; 常见的属性简写包括: * `font` * `background` * `transition` * `animation` ~~~ /* not good */ .element { transition: opacity 1s linear 2s; } /* good */ .element { transition-delay: 2s; transition-timing-function: linear; transition-duration: 1s; transition-property: opacity; } ~~~ ## 媒体查询 尽量将媒体查询的规则靠近与他们相关的规则,不要将他们一起放到一个独立的样式文件中,或者丢在文档的最底部,这样做只会让大家以后更容易忘记他们。 ~~~ .element { ... } .element-avatar{ ... } @media (min-width: 480px) { .element { ... } .element-avatar { ... } } ~~~ ## 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 { ... } } ~~~ ## 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。 ~~~ /* not good */ .element { } /* not good */ LI { ... } /* good */ li { ... } /* not good */ .element { color: rgba(0, 0, 0, 0.5); } /* good */ .element { color: rgba(0, 0, 0, .5); } /* not good */ .element { width: 50.0px; } /* good */ .element { width: 50px; } /* not good */ .element { width: 0px; } /* good */ .element { width: 0; } /* not good */ .element { border-radius: 3px; -webkit-border-radius: 3px; -moz-border-radius: 3px; background: linear-gradient(to bottom, #fff 0, #eee 100%); background: -webkit-linear-gradient(top, #fff 0, #eee 100%); background: -moz-linear-gradient(top, #fff 0, #eee 100%); } /* good */ .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%); } /* not good */ .element { color: rgb(0, 0, 0); width: 50px; color: rgba(0, 0, 0, .5); } /* good */ .element { color: rgb(0, 0, 0); color: rgba(0, 0, 0, .5); } ~~~