javascript 对象过滤器 - 不返回关联键

Question

使用 underscorejs 我可以过滤对象中的数据，但它不会保留它的键。有没有办法用键取回对象

var data = {
  foo: 'fff',
  bar: 'sss',
  aaa: 'gggg'
}
console.info('returns array with keys:')

console.log(data)

var ret = _.filter(data, function(el, key) {
  if (key == 'foo' || el == 'sss') {
    return true
  }
})

console.info('keys are lost?')
console.log(ret)

这是 fiddle :https://jsfiddle.net/7L7tmq7s/

Answer 1

不用过滤器就可以解决:

console.log(data)
var filtered = {};
var ret = _.each(data, function(el, key) {
  if ((key == 'foo' || el == 'sss')) {
    filtered[key] = el;
  }
})

console.info('keys are not lost?')
console.log(filtered)

工作代码here