aaac7fed
 liuqimichale
add
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"use strict";
var getPrototypeOf = Object.getPrototypeOf
, prototype = Object.prototype
, objToString = prototype.toString
, id = Object().toString();
module.exports = function (value) {
var proto, valueConstructor;
if (!value || typeof value !== "object" || objToString.call(value) !== id) {
return false;
}
proto = getPrototypeOf(value);
if (proto === null) {
valueConstructor = value.constructor;
if (typeof valueConstructor !== "function") return true;
return valueConstructor.prototype !== value;
}
return proto === prototype || getPrototypeOf(proto) === null;
};
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