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Less 安装

2016-12-28 10:04:09 更新

本文提供了LESS安装的步骤过程。

LESS的系统要求

操作系统:跨平台
浏览器支持: IE(Internet Explorer 8+)，Firefox，Google Chrome，Safari。

安装LESS

步骤(1):我们需要NodeJ运行LESS示例。要下载NodeJ，请打开链接 https://nodejs.org/en/ ，您会看到如下所示的屏幕:

下载zip文件的最新功能版本。

步骤(2):接下来，运行安装程序以在系统上安装 Node.js 。

步骤(3):接下来，通过NPM(节点程序包管理器)在服务器上安装LESS。在命令提示符下运行以下命令。

npm install -g less

步骤(4):接下来，在成功安装LESS后，您将在命令提示符下看到以下行:

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例子

下面是一个简单的LESS示例。

hello.htm

<!doctype html>
<head>
	<link rel="stylesheet" href="style.css" type="text/css" />
</head>
<body>
	<h1>Welcome to W3Cschool</h1>
	<h3>Hello!!!!!</h3>
</body>
</html>

接下来，让我们创建一个与CSS非常相似的文件 style.less ，唯一的区别是它将以 .less 扩展名保存。应在文件夹 nodejs 中创建文件 .html 和 .less 。

style.less

@primarycolor: #FF7F50;
@color:#800080;
h1{
color: @primarycolor;
}
h3{
color: @color;
}

使用以下命令将 style.less 文件编译为 style.css :

lessc style.less style.css

当您运行上述命令时，它将自动创建 style.css 文件。无论何时更改LESS文件，都需要在cmd中运行上面的命令，然后更新 style.css 文件。

运行以上命令时， style.css 文件将具有以下代码:

style.css

h1 {
  color: #FF7F50;
}
h3 {
  color: #800080;
}

输出

让我们执行以下步骤，看看上面的代码如何工作:

将上面的html代码保存在 hello.htm 文件中。
在浏览器中打开此HTML文件，将显示如下输出。

Less编译css工具

您可以使用Less编译成css工具进行测试

Less 嵌套规则 →