比较两个对象中存在的属性

我有两个对象:

var a = {
  world: 'Mamba',
  planet: 'Oliver'
}

var b = {
  world: 'Koko'
}

如何只比较两个对象中存在的属性？在我的例子中,它将是属性"世界".

使用下划线:

您可以获取两个对象的键(使用Object.keys),对它们执行交集(使用_.intersect)并迭代它们并比较:

var keys1 = Object.keys(a);
var keys2 = Object.keys(b);

var common = _.intersection(keys1, keys2);

common.forEach(function(key) {
    if(a[key] === b[key]) { 
       // they are equal 
    }
});

DEMO

var a = {
  world: 'Mamba',
  planet: 'Oliver',
  test: 'x'
};

var b = {
  world: 'Koko',
  test: 'x'
};

var keys1 = Object.keys(a);
var keys2 = Object.keys(b);

var common = _.intersection(keys1, keys2);

var list = document.getElementById('list');
common.forEach(function(c) {
  list.innerHTML += ('
' + c + '
');
});

common.forEach(function(key) {

  var elem = document.getElementById(key);
  if (a[key] === b[key]) {
    elem.innerHTML += ' [equal]';
  } else {
     elem.innerHTML += ' [not equal]';  
  }
});

Common Properties