该函数检查浏览器是否支持地理定位。
This function checks to see if geolocation is supported on the browser.
因此在使用方法或者属性之前我们必须对浏览器的支持性做必要的检查。
Therefore we must first check if the browser supports the methods or properties we want to use.
也就是说，并不是去检查是否支持某一特定版本的IE浏览器，而是去检查在所用IE的版本中是否对所用到的每个调用进行支持。
This means that instead of checking if a specific version of IE is supported, it instead checks that the individual calls it USES are supported in the version of IE being used.
多个浏览器检查：通常主题和模板支持部分处理了网站设计和布局的浏览器问题，但是一些专注的评论员可能在不同的浏览器上检查你的站点来帮助你。
Typically, the Themes and Templates Support section handles issues with browsers on website design and layout, but some dedicated reviewers may inspect your site in various browsers to help you out.
多个浏览器检查：通常主题和模板支持部分处理了网站设计和布局的浏览器问题，但是一些专注的评论员可能在不同的浏览器上检查你的站点来帮助你。
Typically, the Themes and Templates Support section handles issues with browsers on website design and layout, but some dedicated reviewers may inspect your site in various browsers to help you out.
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