underscore.js _has[Object]

Does the object contain the given key? Identical to object.hasOwnProperty(key), but uses a safe reference to the hasOwnProperty function, in case it's been

功能等同于object.hasOwnProperty(key)，用于检测对象是否存在该属性.

_.has({a: 1, b: 2, c: 3}, "b");
=> true

源码:

 _.has = function(obj, key) {
    return hasOwnProperty.call(obj, key);
  };