How to use less with vue.js?

The operating environment of this tutorial: windows7 system, vue2.9 version, this method is suitable for all brands of computers.

vue uses less

Dependency download

1. First use npm to download dependencies;

npm install --save less less-loader

2. After the installation is completed, check whether the installation is successful;

lessc -v

3. If the installation is successful, the version after successful installation will be displayed;

Reference method

1. In main.js

import less from 'less'
Vue.use(less)

2. Then create a .vue file and we start playing;

Note : The independent vue file needs to introduce less

<style lang="less"></style>

to start using it

1. The use of variables in less;

In less, we are allowed to use Define the variable in the form of: @k:v; Usage: @k;

<p class="box"></p>

<style lang="less">
@color:red;
@k:100px;
.box{
width:@k;
height:@k;
background: @color;
}
</style>

At this time, a square with a width of 100px, a height of 100px and a red background will be displayed on the page;

2. How to use string splicing variables;

<p class="box1"></p>

<style lang="less" scoped>
@img:&#39;./img/&#39;;
@k:100px;
.box1{
    width:@k;
    height:@k;
    background:url("@{img}1.png")
}
</style>

Note: The path needs to be wrapped with "", @{img} usually introduces variables to take effect;

3. Multi-layer nested variable calculation;

<p class="box1">
    <p class="box2">
        <p class="box3"></p>
    </p>
</p>

<style lang="less">
@k:100px;
 .box1{
     width: @k;
     height:@k;
     background: red;
     .box2{
         width: @k/2;
         height:@k/2;
         background: green;
         .box3{
             width: @k/3;
             height:@k/3;
             background: blue;
         }
     }
 }
</style>

As you can see, less can be used in nesting, so we can see it at once Understand the CSS structure; in addition to nested use, have you found that its calculation is really powerful?

4. Mix = function

<p class="box1">我是box1</p>
<p class="box2">我是box2</p>

<style lang="less">
//定义一个函数；
.test(@color:red,@size:14px){
    background: @color;
    font-size:@size;
}
.box1{
//  不传参，使用默认的；
    .test()
}
.box2{
//  给函数传参；
    .test(@color:green,@size:30px)
}
</style>

5. Matching pattern

<p class="box"></p>
//定义的css
<style lang="less">
.sjx(@_,@color,@size){
    width: 0;
    height:0;
    border:@size solid @color;
    border-color:transparent;
}
//左边三角形
.sjx(l,@color,@size){
    border-left-color:@color;
}
//上边三角形
.sjx(t,@color,@size){
    border-top-color:@color;
}
//右边三角形
.sjx(r,@color,@size){
    border-right-color:@color;
}
//左边三角形
.sjx(b,@color,@size){
    border-bottom-color:@color;
}
//这里匹配调用
.box{
    .sjx(r,red,20px)
}
</style>

box matching It is t (top), which is the upper one.

The box matches b (buttom), which is the lower one;

Summary The matching pattern is like the switch statement in js. Whatever is entered will be displayed; but it doesn’t matter what you feel;

7. Color function

<p>默认红色</p>
<p>默认绿色</p>
<ul>
    <li <li v-for="i in 6">测试</li> 
</ul>
<span>混合</span>

<style lang="less" scoped>
    *{
        padding: 0;
        margin: 0;
    }
    @color:red;
    @color1:green;
    p:nth-child(1){
        background: @color;
    };
     p:nth-child(2){
        background: @color1;
    };
    ul{
        list-style: none;
            li:nth-child(1){
            background:lighten(@color,50%);
        }
            li:nth-child(2){
            background:darken(@color,50%);
        }
            li:nth-child(3){
            background:saturate(@color,50%);
        }
            li:nth-child(4){
            background:desaturate(@color,50%);
        }
            li:nth-child(5){
            background:spin(@color,50%);
        }
            li:nth-child(6){
            background:spin(@color,50%);
        }
    }
    span{
        background: mix(@color,@color1);
    }
</style>

8. Operator

can calculate height, width, and angle;

<ul>
    <li v-for="item in 4">{{item}}</li>
</ul>
<style lang="less" scoped>
  @k:10px;
    ul{
        list-style: none;
           li{
               border:1px solid ;
               margin:10px 0 ;
           }
            li:nth-child(1){
                width: @k + @k;
                height:@k;
            }
            li:nth-child(2){
                width: @k -5px;
                height:@k;
            }
            li:nth-child(3){
                width: @k * @k;
                height:@k;
            }
            li:nth-child(4){
                width: @k / 2;;
                height:@k;
            }
    }
</style>

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