How to install and use Less-JS Tutorial-php.cn

How to install and use Less

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Release： 2018-05-23 14:31:46

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This time I will show you how to install and use Less, and what are the precautions for installing and using Less. The following is a practical case, let's take a look.

node.js is a front-end framework that comes with a package management tool npm

node.js installation

Official website: http://nodejs.cn/

#Verify on the command line whether the installation is successful

Switched to the project directory and initialized a package.json file

Installation and uninstallation of jQuery package (example) Installation

Uninstall

Install Taobao image

2. Installation less

Try it:

test.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
  <link rel="stylesheet" href="style.css" rel="external nofollow" />
</head>
<body>
<p id="box">
  <ul>
    <li>你好</li>
    <li>hello</li>
  </ul>
</p>
</body>
</html>

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style.less

#box{
 width:200px;
 height:200px;
 background-color:blue;
 ul{
  color:white;
  li{
   line-height:50px;
  }
 }
}

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Enter lessc xxx.less xxx.css in the command line,

is as follows:

Open test.html with a browser and take a look Effect bar 3. Basic usage of less

https://

less.bootcss.com/Variable

@red:red;
@w:200px;
#big{
  width:@w;
  height:@w;
  background-color:@red;
  #small{
    width:@w;
    height:@w;
    background-color:@red;
  }
}
p{
  color:@red;
}

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Mixing

.bt{
  width:200px;
  height:200px;
  border-top:2px solid red;
  background-color:red;
}
#big{
  .bt;
  #small{
    .bt;
  }
}

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•Nesting

#box{
  width:100%;
  height:60px;
  background-color:#ccc;
  h3{
    width:100%;
    height:20px;
    background-color:yellow;
  }
  ul{
    list-style:none;   
    li{
      height:40px;
      line-height:40px;
      float:left;
      padding:0 10px;
    }
  }
}

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•Operation

@color:#333;
#box{
  width:100%;
  height:60px;
  background-color:@color+#111;
}
•calc()
@var:50vh/2;
#box{
  width:calc(50% + (@var - 20px));
}

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•Fixed function

@base:#f04615;
@width:0.5;
#box{
  width:percentage(@width);
  color:saturate(@base,5%);
  background-color:spin(lighten(@base,25%),8);
}

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•Comments

//单行注释//
/*多行
 注释*/
•引入其他less文件
@import "other.less";

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I believe you have mastered the method after reading the case in this article , for more exciting content, please pay attention to other related articles on the php Chinese website!