聚合api

An API (Application Programming Interface) is a set of features and rules that exist inside a software program (the application) enabling interaction with it through software - as opposed to a human user interface. The API can be seen as a simple contract (the interface) between the application offering it and other items, such as third-party software or hardware.

> Elasticsearch 聚合API Elasticsearch 提供聚合 API，用于数据的聚合。聚合框架提供基于搜索查询的聚合数据。简而言之，聚合框架收集由搜索查询选择并提供给用户的所有数据。它包含几个构建块，可帮助构建复杂的数据摘要。聚合会生成

The Fetch API provides an interface for fetching resources (including across the network). It is a more powerful and flexible replacement for XMLHttpRequest.

聚合数据官网：http://www.juhe.cn 1.首先注册一个账号，和常规注册一样。 2.然后进入个人中心 3.之后找到我的数据进入申请新数据即可。 4.之后既可以选择我们需要的服务了。 5.之后返回到主页，点击菜单中的数据接口，在SDK中心，选择聚合数据SDK 6.在之后出来的页面的左边，最

The Permissions API provides a consistent programmatic way to query the status of API permissions attributed to the current context, such as a web page or worker. For example, it can be used to determine if permission to access a particular feature or API has been granted, denied, or requires specific user permission.

博客介绍了ES中的简单查询API的使用，本篇将介绍ES提供的聚合API的使用。ES提供的聚合功能可以用来进行简单的数据分析。本文仍然以上一篇提供的数据为例来讲解。数据如下： 本文的主要内容有： metric API的使用 bucketing API的使用 两类API的嵌套使用 1. 聚合API ES

The Navigation API provides the ability to initiate, intercept, and manage browser navigation actions. It can also examine an application's history entries. This is a successor to previous web platform features such as the History API and window.location, which solves their shortcomings and is specifically aimed at the needs of single-page applications (SPAs).

说完了ES的索引与检索，接着再介绍一个ES高级功能API – 聚合(Aggregations)，聚合功能为ES注入了统计分析的血统，使用户在面对大数据提取统计指标时变得游刃有余。同样的工作，你在hadoop中可能需要写mapreduce或hive，在mongo中你必须得用大段的mapreduce脚本

The Geolocation API allows the user to provide their location to web applications if they so desire. For privacy reasons, the user is asked for permission to report location information.

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