詳解Node.js中path模塊的resolve()和join()方法的區(qū)別

第詳解Node.js中path模塊的resolve()和join()方法的區(qū)別關(guān)于Node.js中path模塊的resolve()和join()方法的比較，對(duì)照著總結(jié)看例子差不多以后在寫模塊的時(shí)候思路就能很清晰了

resolve

作用：path.resolve()該方法將一些的路徑/路徑段解析為絕對(duì)路徑。

語法：path.resolve([...paths])

說明：

...pathsstring一個(gè)路徑或路徑片段的序列

如果沒有傳入path片段，或者path片段長(zhǎng)度為零（空字符），則path.resolve()會(huì)返回當(dāng)前工作目錄的絕對(duì)路徑(相當(dāng)于使用path.resolve(__dirname))

例子：我當(dāng)前的工作路徑為/workspace/demo

console.log(path.resolve())//returns/workspace/demo

console.log(path.resolve(''))//returns/workspace/demo

console.log(path.resolve(__dirname))//returns/workspace/demo

console.log(path.resolve('/img/books','/net'))//returns'/net'

console.log(path.resolve('img/books','/net'))//returns'/net'

console.log(path.resolve('img/books','./net'))//returns'/workspace/demo/img/books/net'

console.log(path.resolve('/img/books','./net'))//returns'/img/books/net'

console.log(path.resolve('/img/books','net'))//returns'/img/books/net'

console.log(path.resolve('/img/books','../net'))//returns'/img/net'

console.log(path.resolve('src','/img/books','../net'))//returns'/img/net'

console.log(path.resolve('src','./img/books','../net'))//returns'/workspace/demo/src/img/net'

console.log(path.resolve('src','img/books','../net'))//returns'/workspace/demo/src/img/net'

總結(jié)一下：從后向前，若字符以/開頭，不會(huì)拼接到前面的路徑；若以../開頭，拼接前面的路徑，但是不含前面一節(jié)的最后一層路徑；若以./開頭或者沒有符號(hào)則拼接前面路徑；

join

作用：path.join()方法使用平臺(tái)特定的分隔符把全部給定的path片段連接到一起，并規(guī)范化生成的路徑。

語法：path.resolve([...paths])

說明：

...pathsstring一個(gè)路徑或路徑片段的序列

長(zhǎng)度為零的path片段會(huì)被忽略。如果連接后的路徑字符串是一個(gè)長(zhǎng)度為零的字符串，則返回'.'，表示當(dāng)前工作目錄

例子：

path.join('/img','book','net/abc','inter','..');//returns/img/book/net/abc

console.log(path.join('/img/books','../net'))//returns/img/net

console.log(path.join('img/books','../net'))//returnsimg/net

console.log(path.join('/img/books','./net'))//returns/img/books/net

console.log(path.join('img/books','./net'))//returnsimg/books/net

console.log(path.join('/img/books','net'))//returns/img/books/net

console.log(path.join('img/books','net'))//returns/img/books/net

console.log(path.join('/img/books','/net'))//returns/img/books/net

console.log(path.join('img/books','/net'))//returnsimg/books/net

總結(jié)一下區(qū)別：join()只是拼接各個(gè)path片段，并不像resolve()一樣除了拼接各個(gè)字段還拼接了工作目錄的路徑，其次如果以/開頭的字符串片段在join并不像resolve一樣是只返回自身，還有就是..同../是一個(gè)意思都代表上一級(jí)目錄

兩者區(qū)別：

1、join是把各個(gè)path片段連接在一起，resolve把‘／'當(dāng)成根目錄

path.join('/a','/b')//Outputs'/a/b'

path.resolve('/a','/b')//Outputs'/b'

2、join直接拼接字段，resolve解析路徑并返回

path.join("a","b1","..","b2")

conso