本文共 12852 字，大约阅读时间需要 42 分钟。
使用 soft tab（4个空格）。
.element { position: absolute; top: 10px; left: 10px; border-radius: 10px; width: 50px; height: 50px;}
每个属性声明末尾都要加分号。
.element { width: 20px; height: 20px; background-color: red;}
,前!后(后和)前>, +, ~前后{ 前!前@else 前后,后/*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 { ...}
}后最好跟一个空行，包括scss中嵌套的规则/* not good */.element { ...}.dialog { color: red; &:after { ... }}/* good */.element { ...}.dialog { color: red; &:after { ... }}
{ 前{ 后和}前,后/* not good */.element{ color: red; background-color: black;}/* good */.element { color: red; background-color: black;}/* not good */.element, .dialog { ...}/* good */.element,.dialog { ...}
/* */（scss中也不要用//），具体参照例子的写法；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 */}
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"] { ...}
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 { ...}
相关的属性声明按例子的顺序做分组处理，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16进制尽量用简写。
/* not good */.element { color: #ABCDEF; background-color: #001122;}/* good */.element { color: #abcdef; background-color: #012;}
margin 和 padding 相反，需要使用简写；fontbackgroundtransitionanimation/* not good */.element { transition: opacity 1s linear 2s;}/* good */.element { transition-delay: 2s; transition-timing-function: linear; transition-duration: 1s; transition-property: opacity;}
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 { ... }}
0后面不要加单位；border: 0; 代替 border: none;；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);} 不要使用有 @import；与 <link> 标签相比，@import 指令要慢很多，不光增加了额外的请求次数，还会导致不可预料的问题。替代办法有以下几种：
<link> 元素
转载地址：http://ewdso.baihongyu.com/