对 at.js 的设备上决策支持的功能

的 Adobe Target JS SDK使客户能够灵活地在性能和数据新鲜度之间进行选择，以便做出决策。 In other words, if delivering the most relevant and engaging personalized content via machine learning is most important to you, a live server call should be made. 但是，当性能更为关键时，应该做出设备内和内存内的决策。 For on-device decisioning to work, refer to the following sections that list the features that are supported.

Supported activity types

下表指明了 活动类型 创建者 基于表单的体验编辑器 或 可视化体验编辑器 (VEC)是否支持设备决策。

活动类型	受支持?
A/B 测试	是
自动分配	否
Auto-Target（自动定位）	否
多变量测试 (MVT)	否
Experience Targeting (XT)	是
Automated Personalization	否
Recommendations	否
使用Analytics for Target的活动 (A4T)	是

Audience targeting

The following table indicates which audience rules are supported or not supported for on-device decisioning.

设备上决策的地域定位

为了通过基于地理的受众保持设备上决策活动的最短延迟，Adobe建议您在调用 getOffers. 在请求的上下文中设置Geo对象。 这表示从浏览器中确定每个访客位置的方法。 For example, you can perform an IP-to-Geo lookup, using a service you configure. Some hosting providers, such as Google Cloud, provide this functionality via custom headers in each HttpServletRequest.

window.adobe.target.getOffers({
	decisioningMethod: "on-device",
	request: {
		context: {
			geo: {
				city: "SAN FRANCISCO",
				countryCode: "US",
				stateCode: "CA",
				latitude: 37.75,
				longitude: -122.4
			}
		},
		execute: {
			pageLoad: {}
		}
	}
})

However, if you are not able to perform IP-to-Geo lookups on your server, but you still want to perform on-device decisioning for getOffers requests that contain geo-based audiences, this is also supported. The downside of this approach is that it uses a remote IP-to-Geo lookup, which adds latency to each getOffers call. This latency should be lower than a getOffers call with server-side decisioning, because it hits a CDN that is located close to your server. Provide only the "ipAddress" field in the Geo object in the Context of your request for the SDK to retrieve the geo-location of your visitor's IP address. 如果除了“ipAddress”之外还提供了任何其他字段，则 Target SDK将不会获取用于解析的地理位置元数据。

window.adobe.target.getOffers({
	decisioningMethod: "on-device",
	request: {
		context: {
			geo: {
				ipAddress: "127.0.0.1"
			}
		},
		execute: {
			pageLoad: {}
		}
	}
})

Allocation method

下表指示设备上决策支持或不支持哪些分配方法。