Node.js v6里有哪些新东西？

Posted 2021-04-25 Node全栈

Node.js v6里有哪些新东西？

https://blog.risingstack.com/whats-new-in-node-v6/

性能提升

• 模块加载性能比当前的LTS(Node.js v4)版本要快上4倍，不要误解是整体快4倍. 主要体现在应用引导入口状态的时间减少

• Related PRs:

• Updated V8 engine

安全提升

• Math.random - improved security, but note, that it is still not cryptographically secure

• For more information, check: 

• New Buffer API to reduce the risk of bugs and vulnerabilities leaking into applications

• Related PRs:

新的ES6特性

Default function parameters

function multiply(a, b = 1) {    return a * b
}

multiply(5) // 5  

Learn more on the default function parameters.

Rest parameters

function fun1(...theArgs) {    console.log(theArgs.length)
}

fun1()  // 0  

fun1(5) // 1  

fun1(5, 6, 7) // 3  

Learn more on the rest parameters.

Spread operator

// before the spread operator
function myFunction(x, y, z) { }  
  
var args = [0, 1, 2]  
  
myFunction.apply(null, args)

// with the spread operator
function myFunction(x, y, z) { }  
  
var args = [0, 1, 2]  

myFunction(...args)

Learn more on the spread operator.

Destructuring

var x = [1, 2, 3, 4, 5]   
var [y, z] = x  
 console.log(y) // 1  
console.log(z) // 2  

Learn more on destructuring.

new.target

function Foo() {    if (!new.target) throw 'Foo() must be called with new'  console.log('Foo instantiated with new')
}

Foo() // throws "Foo() must be called with new"  

new Foo() // logs "Foo instantiated with new"  

Learn more on the new.target.

Proxy

The Proxy object is used to define custom behavior for fundamental operations.

var handler = {      get: function(target, name){        return name in target ? target[name] : 37    }
};

var p = new Proxy({}, handler)  
p.a = 1  p.b = undefined

console.log(p.a, p.b) // 1, undefined  
console.log('c' in p, p.c) // false, 37  

Learn more on proxies.

Reflect

Reflect is a built-in object that provides methods for interceptable javascript operations.

Learn more on reflect.

Symbols

A symbol is a unique and immutable data type and may be used as an identifier for object properties.

Symbol("foo") === Symbol("foo"); // false  

Learn more on symbols.

尝试一下热乎的 Node.js v6吧

If you are using nvm, you only have to:

$ nvm install 6  

If you for some reason cannot you nvm, you can download the binary from the official Node.js website.

什么时候可以迁移到Node 6呢？

今年10月份 Node.js v6 会升级到LTS 版本 - 那时你就可以正式的产品环境使用了，目前还不能确定完全稳定。

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