作用：
path.resolve（）方法將一系列路徑或路徑段解析為絕對路徑。

語法：

path.resolve([from ...], to)

說明：將引數 to 位置的字元解析到一個絕對路徑裡。

引數說明

from 源路徑
to 將被解析到絕對路徑的字串
用法：

var path = require('path');
var webpack = require('webpack');
var glob = require('glob')

var ROOT_PATH = path.resolve(__dirname);
var APP_PATH = path.resolve(ROOT_PATH, 'app');
var BUILD_PATH = path.resolve(ROOT_PATH, 'build');
 

例項：

path.resolve('/foo/bar', './baz')
// returns '/foo/bar/baz'

path.resolve('/foo/bar', '/tmp/file/')
// returns '/tmp/file'

path.resolve('wwwroot', 'static_files/png/', '../gif/image.gif')
// if the current working directory is /home/myself/node,
// this returns '/home/myself/node/wwwroot/static_files/gif/image.gif'