在 Node.JS 中解构
IT技术
javascript
node.js
ecmascript-6
destructuring
2021-02-02 20:38:35
3个回答
节点 v6 和更新版本的更新:节点 v6 支持解构赋值,无需任何特殊需要:
var [a, b] = [1, 2];
对于旧版本的节点:您可以通过键入以下内容获取支持的和声功能列表:
node --v8-options | grep harmony
节点 5.x 会给你:
--es_staging (enable all completed harmony features)
--harmony (enable all completed harmony features)
--harmony_shipping (enable all shipped harmony fetaures)
--harmony_modules (enable "harmony modules" (in progress))
--harmony_regexps (enable "harmony regular expression extensions" (in progress))
--harmony_proxies (enable "harmony proxies" (in progress))
--harmony_sloppy_function (enable "harmony sloppy function block scoping" (in progress))
--harmony_sloppy_let (enable "harmony let in sloppy mode" (in progress))
--harmony_unicode_regexps (enable "harmony unicode regexps" (in progress))
--harmony_reflect (enable "harmony Reflect API" (in progress))
--harmony_destructuring (enable "harmony destructuring" (in progress))
--harmony_default_parameters (enable "harmony default parameters" (in progress))
--harmony_sharedarraybuffer (enable "harmony sharedarraybuffer" (in progress))
--harmony_atomics (enable "harmony atomics" (in progress))
--harmony_simd (enable "harmony simd" (in progress))
--harmony_array_includes (enable "harmony Array.prototype.includes")
--harmony_tostring (enable "harmony toString")
--harmony_concat_spreadable (enable "harmony isConcatSpreadable")
--harmony_rest_parameters (enable "harmony rest parameters")
--harmony_sloppy (enable "harmony features in sloppy mode")
--harmony_arrow_functions (enable "harmony arrow functions")
--harmony_new_target (enable "harmony new.target")
--harmony_object_observe (enable "harmony Object.observe")
--harmony_spreadcalls (enable "harmony spread-calls")
--harmony_spread_arrays (enable "harmony spread in array literals")
--harmony_object (enable "harmony Object methods")
您需要的标志--harmony_destructuring
是在 Node 4.1 中添加的。目前,您需要传递--harmony_destructuring
标志以启用该功能:
$ node --harmony_destructuring
> var {foo} = {foo: 'bar'};
undefined
> foo
'bar'
所述ES6兼容性表显示,拆解未在任一铬45,或节点V4的支持。