检测Node.js是否支持ES6 |
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如果读者安装的Node.js版本较新，则可以支持大量的JavaScript ES6语法；如果版本太旧并且无法升级，那么该如何检测其是否支持这些新的语法？ 这里推荐使用es-checker来检测当前Node.js对ES6的支持情况。使用如下命令安装es-checker: npm install -g es-checker安装后，使用命令es-checker检测当前Node.js的版本支持情况，结果如下图： ~ % es-checker ECMAScript 6 Feature Detection (v1.4.2) Variables √ let and const √ TDZ error for too-early access of let or const declarations √ Redefinition of const declarations not allowed √ destructuring assignments/declarations for arrays and objects √ ... operator Data Types √ For...of loop √ Map, Set, WeakMap, WeakSet √ Symbol √ Symbols cannot be implicitly coerced Number √ Octal (e.g. 0o1 ) and binary (e.g. 0b10 ) literal forms √ Old octal literal invalid now (e.g. 01 ) √ Static functions added to Math (e.g. Math.hypot(), Math.acosh(), Math.imul() ) √ Static functions added to Number (Number.isNaN(), Number.isInteger() ) String √ Methods added to String.prototype (String.prototype.includes(), String.prototype.repeat() ) √ Unicode code-point escape form in string literals (e.g. \u{20BB7} ) √ Unicode code-point escape form in identifier names (e.g. var \u{20BB7} = 42; ) √ Unicode code-point escape form in regular expressions (e.g. var regexp = /\u{20BB7}/u; ) √ y flag for sticky regular expressions (e.g. /b/y ) √ Template String Literals Function √ arrow function √ default function parameter values √ destructuring for function parameters √ Inferences for function name property for anonymous functions × Tail-call optimization for function calls and recursion Array √ Methods added to Array.prototype ([].fill(), [].find(), [].findIndex(), [].entries(), [].keys(), [].values() ) √ Static functions added to Array (Array.from(), Array.of() ) √ TypedArrays like Uint8Array, ArrayBuffer, Int8Array(), Int32Array(), Float64Array() √ Some Array methods (e.g. Int8Array.prototype.slice(), Int8Array.prototype.join(), Int8Array.prototype.forEach() ) added to the TypedArray prototypes √ Some Array statics (e.g. Uint32Array.from(), Uint32Array.of() ) added to the TypedArray constructors **Object** √ __proto__ in object literal definition sets [[Prototype]] link √ Static functions added to Object (Object.getOwnPropertySymbols(), Object.assign() ) √ Object Literal Computed Property √ Object Literal Property Shorthands √ Proxies √ Reflect Generator and Promise √ Generator function √ Promises Class √ Class √ super allowed in object methods √ class ABC extends Array { .. } Module × Module export command × Module import command ========================================= Passes 39 feature Detections Your runtime supports 92% of ECMAScript 6 =========================================从上面可以看出，当前版本的Node.js实际上已经支持了大量的ES6特性和语法，但没有支持包的import export。这类问题可以使用Babel解决，将ES6转换为ES5,这样Node.js就支持了所有的ES6特性了。 |
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