How to use Less and Sass framework?
1. Less syntax
1. Variable declaration:
@Variable name: variable value;
1 @newHeight:20px;
2. Call variables:
1 .box {2 width: @newHeight;3 height: @newHeight;
4 }3. Multiple inheritance (Mixins): Call existing classes as Own member
1 .box1 {2 .box;3 }4. Function with parameters:
1 .newBox(@newWidth) {2 height: @newWidth;3 }4 .box2 {5 .newBox(20px);6 }5. Nesting:(There cannot be nesting in CSS)
1 .box1 {2 height: 200px;3 width: 100px;4 .box2 {5 height: 200px;6 width: 50px;7 }8 } 1 /*以下两种格式的代码实现的是同一种效果*/ 2 a { 3 &:hover { 4 color: red; 5 } 6 } 7 8 a:hover { 9 color: red;10 }2. Sass/Scss syntax
Sass omitted Replace the curly brackets {} and the semicolon at the end of the statement in CSS; and use indentation and line breaks instead; files ending with ".sass";
Scss is also a form of Sass , {} and; are used in its syntax, and variables are declared using $; usually Scss is used, and files ending with ".scss" are used.
1. Variable declaration and calling:
1 /*声明*/2 $newWeight: 30px;3 /*调用*/4 .box {5 width: $newWeight;6 }2. Attribute nesting:
1 /*将box1的border设置为1px solid red的边框*/ 2 .box1 { 3 wiodth: $newWeight; 4 border: { 5 top: 1px solid red; 6 right: 1px solid red; 7 bottom: 1px solid red; 8 left: 1px solid red; 9 }10 }3. Mixed macro:
1 /*声明不带参数的混合宏*/ 2 @mixin newName { 3 width: 50px; 4 } 5 /*调用不带参数的混合宏*/ 6 .box { 7 @include newName; 8 } 9 /*声明带参数的混合宏*/10 @mixin newName($newColor) {11 background-color: $newColor;12 }13 /*调用带参数的混合宏*/14 .box2 {15 @include newNmae(red);16 }4. Inheritance:
1 .global {2 3 outline: 1px solid red;4 }5 /*继承使用extend*/6 input[type="text"] {7 color: yellow;8 @extend .golbal;9 }5. Placeholder:
1 %test {2 width: 20px;3 }4 .box {5 @extend %test;6 }If a class declared with a placeholder has not been called, it will not be included in the compiled " .css" file.
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