Object.keys/values/entries

const obj = {
  foo: 'value1',
  bar: 'value2'
}
// Object.keys -----------------------------------------------------------
console.log(Object.keys(obj)) // [ 'foo', 'bar' ]
// Object.values -----------------------------------------------------------
console.log(Object.values(obj)) // [ 'value1', 'value2' ]
// Object.entries，把对象变成键值对数组 ----------------------------------------------------------
console.log(Object.entries(obj)) // [ [ 'foo', 'value1' ], [ 'bar', 'value2' ] ]
for (const [key, value] of Object.entries(obj)) {
  console.log(key, value)
}

对象转化为map

// 对象转化为map
console.log(new Map(Object.entries(obj))) 
// Map(2) { 'foo' => 'value1', 'bar' => 'value2' }