node --print-bytecode
/// 输出子节码
node --trace-opt-verbose

Reflect.ownKeys

process._debugProcess         
process.binding('contextify')        
let obj={a:10,b:20}
var {a:MM}=obj  // 将obj.a 赋值给MM


var {foo = 3} = {}
console.log(foo); //3

var {baz:foo = 3} = {baz: null}
console.log(foo); //null

var {baz:foo = 5} = {baz: undefined}
console.log(foo); //5
node-threads-a-gogo