ut2/lib/isPlainObject.js

一个现代 JavaScript 实用工具库。[点击查看在线文档]。

'use strict';

var getTag = require('./internals/getTag.js');
var native = require('./internals/native.js');
var isObjectLike = require('./isObjectLike.js');

var objectCtorString = native.functionProtoToString.call(Object);
function isPlainObject(value) {
    if (!isObjectLike(value) || getTag(value) !== native.objectTag) {
        return false;
    }
    var proto = native.objectGetPrototypeOf(Object(value));
    if (proto === null) {
        return true;
    }
    var Ctor = native.objectProtoHasOwnProperty.call(proto, 'constructor') && proto.constructor;
    return typeof Ctor === 'function' && Ctor instanceof Ctor && native.functionProtoToString.call(Ctor) === objectCtorString;
}

module.exports = isPlainObject;