已经 - proto

此环境是否有能力设定一个对象的[原型] 设定在创建时使用 __proto__? 吗?

示例

var hasProto = require('has-proto');
var assert = require('assert');

assert.equal(typeof hasProto(), 'boolean');

var hasProtoAccessor = require('has-proto/accessor')();
if (hasProtoAccessor) {
    assert.equal([].__proto__, Array.prototype);
} else {
    assert(!('__proto__' in Object.prototype));
}

var hasProtoMutator = require('has-proto/mutator');
var obj = {};
assert('toString' in obj);

obj.__proto__ = null;
if (hasProtoMutator) {
    assert(!('toString' in obj));
} else {
    assert('toString' in obj);
    assert.equal(obj.__proto__, null);
}

测试

仅仅复制回转, npm install运行 npm test