css - NodeJS 看不到 LESS，尽管它是使用全局选项安装的

Question

我安装了nodejs 我安装了 npm 我使用 -g 选项安装了 less

但是当我通过控制台运行 nodejs 并编写命令 less 时，有:

ReferenceError: less is not defined
    at repl:1:2
    at REPLServer.self.eval (repl.js:110:21)
    at Interface.<anonymous> (repl.js:239:12)
    at Interface.EventEmitter.emit (events.js:95:17)
    at Interface._onLine (readline.js:202:10)
    at Interface._line (readline.js:531:8)
    at Interface._ttyWrite (readline.js:760:14)
    at ReadStream.onkeypress (readline.js:99:10)
    at ReadStream.EventEmitter.emit (events.js:98:17)
    at emitKey (readline.js:1095:12)

我可以运行 less 或 lessc，但在 nodejs 之外

回答回复:

var less = require('less');
Error: Cannot find module 'less'
    at Function.Module._resolveFilename (module.js:338:15)
    at Function.Module._load (module.js:280:25)
    at Module.require (module.js:364:17)
    at require (module.js:380:17)
    at repl:1:12
    at REPLServer.self.eval (repl.js:110:21)
    at repl.js:249:20
    at REPLServer.self.eval (repl.js:122:7)
    at Interface.<anonymous> (repl.js:239:12)
    at Interface.EventEmitter.emit (events.js:95:17)

我需要它用于 Assetic Symfony2

当我尝试通过 symfony2 控制台执行 assetic:dump 时，我遇到了与我在 nodejs“环境”中运行它时遇到的错误相同的错误...

Answer 1

您需要要求模块:

var less = require('less')

http://lesscss.org/#usage在 Node 中有一个示例(搜索代码中的用法小节):

var less = require('less');

less.render('.class { width: (1 + 1) }', function (e, css) {
    console.log(css);
});