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兼容性

njs 的创建遵循 ECMAScript 5.1（严格模式），并带有一些 ECMAScript 6 及更高版本的扩展。兼容性仍在不断发展。

与 ECMAScript 不兼容的 njs 特有属性和方法的定义可以在 参考文档 中找到。与 ECMAScript 兼容的 njs 属性和方法的定义可以在 ECMAScript 规范 中找到。

当前支持的功能

• 布尔值、数字、字符串、对象、数组、函数、函数构造函数 (0.3.6) 和正则表达式
• ES5.1 运算符，ES7 幂运算符
• ES5.1 语句：break, catch, continue, do while, else, finally, for, for in, if, return, switch, throw, try, var, while, 带标签的语句 (0.2.8)
• ES6 语句：let (0.6.0), const (0.6.0), async (0.7.0), await (0.7.0)
• Math 属性
  • ES6: E, LN10, LN2, LOG10E, LOG2E, PI, SQRT1_2, SQRT2
• Math 方法
  • ES6: abs, acos, acosh, asin, asinh, atan, atan2, atanh, cbrt, ceil, clz32, cos, cosh, exp, expm1, floor, fround, hypot, imul, log, log10, log1p, log2, max, min, pow, random, round, sign, sin, sinh, sqrt, tan, tanh, trunc
• Number 属性
  • ES6: EPSILON, MAX_SAFE_INTEGER, MAX_VALUE, MIN_SAFE_INTEGER, MIN_VALUE, NEGATIVE_INFINITY, NaN, POSITIVE_INFINITY
• Number 方法
  • ES6: isFinite, isInteger, isNaN, isSafeInteger, parseFloat, parseInt
• Number 原型方法
  • ES6: toExponential (0.3.6), toFixed (0.3.6), toPrecision (0.3.6)
• String 方法
  • ES5.1: fromCharCode
  • ES6: fromCodePoint
• String 原型方法
  • ES5.1: charAt, concat, indexOf, lastIndexOf, match, replace, search, slice, split, substr, substring, toLowerCase, trim, toUpperCase
  • ES6: codePointAt, endsWith, includes, repeat, startsWith
  • ES8: padEnd, padStart
  • ES9: trimEnd (0.3.4), trimStart (0.3.4)
  • ES12: replaceAll (0.7.10)
• Object 方法
  • ES5.1: create (不支持属性列表), defineProperties (自 0.3.3 版本起支持访问器描述符), defineProperty (自 0.3.3 版本起支持访问器描述符), freeze, getOwnPropertyDescriptor, getOwnPropertyDescriptors (0.3.1), getOwnPropertyNames (0.3.1), getPrototypeOf, isExtensible, isFrozen, isSealed, keys, preventExtensions, seal
  • ES6: assign (0.3.7)
  • ES8: entries (0.2.7), values (0.2.7)
• Object 原型方法
  • ES5.1: hasOwnProperty, isPrototypeOf, (0.3.0), propertyIsEnumerable, toString, valueOf
  • ES6: is (0.3.8), setPrototypeOf (0.3.8)
• Array 方法
  • ES5.1: isArray
  • ES6: of
  • ES13: from (0.8.0),
• Array 原型方法
  • ES5.1: concat, every, filter, forEach, indexOf, join, lastIndexOf, map, pop, push, reduce, reduceRight, reverse, shift, slice, some, sort, splice, unshift
  • ES6: copyWithin (0.3.7), fill, find, findIndex
  • ES7: includes
  • ES13: toReversed (0.8.0), toSorted (0.8.0), toSpliced (0.8.0)
• ArrayBuffer 方法 (0.3.8)
  • ES6: isView
• ArrayBuffer 原型方法 (0.3.8)
  • ES6: slice
• Typed-array 构造函数 (0.3.8)
  • ES6: Int8Array, Uint8Array, Uint8ClampedArray, Int16Array, Uint16Array, Int32Array, Uint32Array, Float32Array, Float64Array
• Typed-array 原型方法 (0.3.8)
  • ES6: copyWithin, every (0.4.4), fill, filter (0.4.4), find (0.4.4), findIndex (0.4.4), forEach (0.4.4), includes (0.4.4), indexOf (0.4.4), join, lastIndexOf (0.4.4), map (0.4.4), reduce (0.4.4), reduceRight (0.4.4), reverse (0.4.4), set, slice, some (0.4.4), sort (0.4.2), subarray, toString
  • ES13: toReversed (0.8.0) toSorted (0.8.0)
• Buffer 方法 (0.4.4)
  • alloc, allocUnsafe, byteLength, compare, concat, from, isBuffer, isEncoding
• Buffer 原型方法: (0.4.4)
  • compare, copy, equals, fill, includes, indexOf, lastIndexOf, readIntBE, readInt8, readInt16BE, readInt32BE, readIntLE, readInt8, readInt16LE, readInt32LE, readUIntBE, readUInt8, readUInt16BE, readUInt32BE, readUIntLE, readUInt8, readUInt16LE, readUInt32LE, readDoubleBE, readDoubleLE, readFloatBE, readFloatLE, subarray, slice, swap16, swap32, swap64, toJSON, toString, write, writeIntBE, writeInt8, writeInt16BE, writeInt32BE, writeIntLE, writeInt8, writeInt16LE, writeInt32LE, writeUIntBE, writeUInt8, writeUInt16BE, writeUInt32BE, writeUIntLE, writeUInt8, writeUInt16LE, writeUInt32LE, writeDoubleBE, writeDoubleLE, writeFloatBE, writeFloatLE
• Promise 方法 (0.3.8)
  • ES6: any (0.6.2), all (0.6.2), allSettled (0.6.2), reject, resolve, race (0.6.2)
• Promise 原型方法 (0.3.8)
  • ES6: catch, finally, then
• Function 原型方法
  • ES5.1: apply, bind, call
• RegExp 原型访问器属性
  • flags (0.6.0), global, ignoreCase, multiline, source, sticky (0.6.0)
• RegExp 原型方法
  • [@@replace] (0.4.2), [@@split] (0.6.0)
  • ES5.1: exec, test, toString
• RegExp 实例属性
  • lastIndex
• RegExp ES9 命名捕获组 (0.3.2)
• DataView 原型方法 (0.4.4)
  • ES6: getFloat32, getFloat64, getInt16, getInt32, getInt8, getUint16, getUint32, getUint8, setFloat32, setFloat64, setInt16, setInt32, setInt8, setUint16, setUint32, setUint8
• Date 方法
  • ES5.1: now, parse, UTC
• Date 原型方法
  • ES5.1: getDate, getDay, getFullYear, getHours, getMilliseconds, getMinutes, getMonth, getSeconds, getTime, getTimezoneOffset, getUTCDate, getUTCDay, getUTCFullYear, getUTCHours, getUTCMilliseconds, getUTCMinutes, getUTCMonth, getUTCSeconds, toDateString, toISOString, toLocaleDateString, toLocaleString, toLocaleTimeString, toTimeString, toUTCString, setDate, setFullYear, setHours, setMinutes, setMilliseconds, setMonth, setSeconds, setTime, setUTCDate, setUTCFullYear, setUTCHours, setUTCMilliseconds, setUTCMinutes, setUTCMonth, setUTCSeconds
• JSON 方法
  • ES5.1: parse, stringify
• Symbol 方法 (0.7.6)
  • for, keyfor
• ES5.1 arguments 对象 (0.2.5)
• ES6 剩余参数语法（不支持解构）(0.2.7)
• ES5.1 全局函数: decodeURI, decodeURIComponent, encodeURI, encodeURIComponent, isFinite, isNaN, parseFloat, parseInt
• 全局函数 (0.7.6): atob, btoa
• Error 对象: Error, EvalError, InternalError, RangeError, ReferenceError, SyntaxError, TypeError, URIError
• clearTimeout 和 setTimeout 函数 (0.2.0)
• 文件系统方法: fs.accessSync (0.3.9), fs.appendFileSync, fs.closeSync, fs.existsSync (0.8.2), fs.FileHandle (0.7.7), fs.fstatSync (0.7.7), fs.lstatSync (0.7.1), fs.mkdirSync (0.4.2), fs.openSync (0.7.7), fs.promises.open (0.7.7), fs.readdirSync (0.4.2), fs.readFileSync, fs.readSync (0.7.7), fs.realpathSync (0.3.9), fs.renameSync (0.3.4), fs.rmdirSync (0.4.2), fs.symlinkSync (0.3.9), fs.unlinkSync (0.3.9), fs.writeFileSync fs.writeSync (0.7.7)
• fs.promises API (0.3.9)，文件系统方法的异步版本。
• Crypto 方法 (0.2.0): crypto.createHash, crypto.createHmac
• Query String 方法 (0.4.3): querystring.decode, querystring.encode, querystring.escape, querystring.parse, querystring.stringify, querystring.unescape
• TextDecoder 方法 (0.4.3): encoding, fatal, ignoreBOM, decode
• TextEncoder 方法 (0.4.3): encode, encodeInto
• XML 方法 (0.7.10): parse, xml.c14n, xml.exclusiveC14n
• zlib 方法 (0.7.12): deflateRawSync, deflateSync, inflateRawSync inflateSync
• ES6 模块支持：默认 export 和默认 import 语句 (0.3.0)
• ES6 箭头函数 (0.3.1)
• 模板字面量：多行字符串、表达式插值、嵌套模板 (0.3.2)
• 全局对象 (0.3.3)
  • console (0.8.2): error, info, log, time, timeEnd, warn
  • crypto (0.7.0): getRandomValues, subtle.encrypt, subtle.decrypt, subtle.deriveBits, subtle.deriveKey, subtle.digest subtle.exportKey (0.7.10), subtle.generateKey (0.7.10), subtle.importKey, subtle.sign, subtle.verify
  • globalThis 别名 (0.3.8)，
  • njs: version, version_number (0.7.4), dump, memoryStats (0.7.8), on (0.5.2)
  • process: argv, env, pid, ppid
• nginx 对象方法
  • HTTP Request: r.done (0.5.2), r.error, r.finish, r.internalRedirect, r.log, r.return (0.5.0), r.send (0.5.0), r.sendBuffer (0.5.2), r.sendHeader, r.setReturnValue (0.7.0), r.subrequest, r.warn
  • Stream Session: s.allow (0.2.4), s.decline (0.2.4), s.deny (0.2.4), s.done (0.2.4), s.error, s.log, s.off (0.2.4), s.on (0.2.4), s.send (0.2.4), s.sendDownstream (0.7.8), s.sendUpstream (0.7.8), s.setReturnValue (0.7.0), s.warn
  • Headers (0.5.1): append, delete, get, getAll, forEach, has, set
  • Request (0.7.10): arrayBuffer, headers, json, text
  • Response (0.5.1): arrayBuffer, ok, redirected, status, statusText, type, url
  • ngx (0.5.0): fetch (0.5.1), log
  • ngx.shared (0.8.0): add, clear, delete, freeSpace, get, has, incr, items, keys, pop, replace, set, size
• nginx 对象属性
  • HTTP Request: r.args, r.headersIn, r.headersOut, r.httpVersion, r.internal, r.method, r.parent, r.rawHeadersIn (0.4.1), r.rawHeadersOut (0.4.1), r.rawVariables (0.5.0), r.remoteAddress, r.requestBuffer (0.5.0), r.requestText, r.responseBuffer (0.5.0), r.responseText (0.5.0), r.status, r.uri, r.variables (0.2.8)
  • Stream Session: s.remoteAddress, s.rawVariables (0.5.0), s.status (0.5.2), s.variables (0.2.8)
  • Periodic Session (0.8.1): PeriodicSession.rawVariables, PeriodicSession.variables
  • Request (0.7.10): bodyUsed, cache, credentials, method, mode, url
  • Response (0.5.1): bodyUsed, ok, redirected, status, statusText, type, url
  • ngx (0.5.0): build (0.8.0), conf_file_path (0.8.0), conf_prefix (0.7.8), error_log_path (0.8.0), prefix (0.8.0), version (0.8.0), version_number (0.8.0), worker_id (0.8.0)
  • ngx.shared (0.8.0): capacity, name, type