如何在没有构造函数的情况下为"this“赋值

var obj = {
  property1: value1,
  property2: value2,
  method1: function() {
    // 方法实现
  }
};

var obj = Object.create(proto, {
  property1: {
    value: value1,
    writable: true,
    enumerable: true,
    configurable: true
  },
  property2: {
    value: value2,
    writable: true,
    enumerable: true,
    configurable: true
  },
  method1: {
    value: function() {
      // 方法实现
    },
    writable: true,
    enumerable: true,
    configurable: true
  }
});

var obj = Object.assign({}, {
  property1: value1,
  property2: value2,
  method1: function() {
    // 方法实现
  }
});