Node.JS中的 path.join 非常方便，能直接按相對或絕對合并路徑，使用： path.join([path1], [path2], [...])，有時侯前端也需要這種方法，如何實現呢？
其實直接從 node.js 的 path.js 拿到源碼加工一下就可以了：
1. 將 const 等 es6 屬性改為 var，以便前端瀏覽器兼容
2. 添加一個判斷路戲分隔符的變量 sep，即左斜杠還是右斜杠，以第一個路戲分隔符為準
3. 將引用的變量和函數放到一個文件里就可以了：
Path 的源碼： https://github.com/nodejs/node/blob/master/lib/path.js
var CHAR_FORWARD_SLASH = 47var CHAR_BACKWARD_SLASH = 92var CHAR_DOT = 46function isPathSeparator(code) { return code === CHAR_FORWARD_SLASH || code === CHAR_BACKWARD_SLASH;}function isPosixPathSeparator(code) { return code === CHAR_FORWARD_SLASH;}function normalize(path) { if (path.length === 0) return '.'; var isAbsolute = path.charCodeAt(0) === CHAR_FORWARD_SLASH; var trailingSeparator = path.charCodeAt(path.length - 1) === CHAR_FORWARD_SLASH; // Normalize the path path = normalizeString(path, !isAbsolute, '/', isPosixPathSeparator); if (path.length === 0 && !isAbsolute) path = '.'; if (path.length > 0 && trailingSeparator) path += '/'; if (isAbsolute) return '/' + path; return path;}function normalizeString(path, allowAboveRoot, separator, isPathSeparator) { var res = ''; var lastSegmentLength = 0; var lastSlash = -1; var dots = 0; var code; for (var i = 0; i <= path.length; ++i) { if (i < path.length) code = path.charCodeAt(i); else if (isPathSeparator(code)) break; else code = CHAR_FORWARD_SLASH; if (isPathSeparator(code)) { if (lastSlash === i - 1 || dots === 1) { // NOOP } else if (lastSlash !== i - 1 && dots === 2) { if (res.length < 2 || lastSegmentLength !== 2 || res.charCodeAt(res.length - 1) !== CHAR_DOT || res.charCodeAt(res.length - 2) !== CHAR_DOT) { if (res.length > 2) { const lastSlashIndex = res.lastIndexOf(separator); if (lastSlashIndex !== res.length - 1) { if (lastSlashIndex === -1) { res = ''; lastSegmentLength = 0; } else { res = res.slice(0, lastSlashIndex); lastSegmentLength = res.length - 1 - res.lastIndexOf(separator); } lastSlash = i; dots = 0; continue; } } else if (res.length === 2 || res.length === 1) { res = ''; lastSegmentLength = 0; lastSlash = i; dots = 0; continue; } } if (allowAboveRoot) { if (res.length > 0) res += `${separator}..`; else res = '..'; lastSegmentLength = 2; } } else { if (res.length > 0) res += separator + path.slice(lastSlash + 1, i); else res = path.slice(lastSlash + 1, i); lastSegmentLength = i - lastSlash - 1; } lastSlash = i; dots = 0; } else if (code === CHAR_DOT && dots !== -1) { ++dots; } else { dots = -1; } } return res;}function join() { if (arguments.length === 0) return '.'; var sep = arguments[0].indexOf('/') > -1 ? '/' : '//' var joined; var firstPart; for (var i = 0; i < arguments.length; ++i) { var arg = arguments[i]; if (arg.length > 0) { if (joined === undefined) joined = firstPart = arg; else joined += sep + arg; } } if (joined === undefined) return '.'; var needsReplace = true; var slashCount = 0; if (isPathSeparator(firstPart.charCodeAt(0))) { ++slashCount; var firstLen = firstPart.length; if (firstLen > 1) { if (isPathSeparator(firstPart.charCodeAt(1))) { ++slashCount; if (firstLen > 2) { if (isPathSeparator(firstPart.charCodeAt(2))) ++slashCount; else { // We matched a UNC path in the first part needsReplace = false; } } } } } if (needsReplace) { // Find any more consecutive slashes we need to replace for (; slashCount < joined.length; ++slashCount) { if (!isPathSeparator(joined.charCodeAt(slashCount))) break; } // Replace the slashes if needed if (slashCount >= 2) joined = sep + joined.slice(slashCount); } return normalize(joined);}使用：
join('../var/www', '../abc')> "../var/abc"join('../var/www', '/abc')../var/www/abc總結
以上所述是小編給大家介紹的使用JavaScript實現node.js中的path.join方法，希望對大家有所幫助，如果對大家有所幫助，如果大家有任何疑問歡迎給我留言，小編會及時回復大家的！
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