【免费】HTML5地理定位-OPEN开发经验库1资源-CSDN文库

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2016/6/3 HTML5地理定位OPEN开发经验库

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HTML5地理定位

HTML5(/lib/tag/HTML5) 2012082709:39:23发布

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HTML地理定位特性使得你的web应用程序可以获得网站浏览者的地理位置。地理位置实际上并不是HTML5规范的一

部分，但是因为HTML5已经成为HTML和JavaScript新特性事实上的标杆，我在这个HTML5教程中介绍地理位置。

安全和隐私

用户通过浏览器对话框接受您的网站访问他们的位置，所以你不能在它们不知道的情况下使用它进行间谍活动。

访问地理位置

地理位置可以在JavaScript中通过浏览器的navigator.geolocation对象访问。地理位置对象允许你通过两个基本方法

访问地理位置：

1.getCurrentPosition()

2.watchPosition()

getCurrentPositio()函数以一次性快照的形式返回游客的位置。watchPosition()函数在每次位置变化的时候返回游客

的位置。它通过位置变化时调用成功或错误的回调函数来实现。

这两个函数需要以下参数：

成功回调函数

错误回调函数（可选）

地理位置选择对象（可选）

正如你看到的，一些参数是可选的。下面是一个例子,通过getCurrentPosition()的成功回调函数访问用户的地理位

置：

 

 

 

 

 

 



地理位置是异步获取的。这意味着，当你调用getCurrentPosition()或watchPosition()时函数会立即返回。当浏览器

知道用户的位置，并且用户已经同意该网站可以访问自己的地理位置，成功回调函数被调用。如果发生错误，错误回

调函数被调用。

位置对象

传递给成功回调函数的位置对象大致如下：

 

 

 



 

 

 



latitude(纬度)和longitude(经度)属性为地理位置坐标。accuracy属性为位置精度(米)。accuracy越小，精度越高。

altitude,altitudeAccuracy,heading和speed属性只有当运行浏览器的设备内置GPS时才可用，否则这些属性的值为

null。

altitude属性为用户的海拔高度。altitudeAccuracy属性为海拔高度精度(米)。heading属性表示用户移动的方向。

value属性是相对于正北的角度（0360）。speed属性为用户的速度(米每秒)，如果有的话。

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