地理位置 html4 的替代方案
html 4 中是否有与 geolocation(html 5) 相对应的内容。html4 中是否有确定用户位置的方法？我还有一个问题是地理定位如何从 IP 地址或其他内容获取用户的位置？
Is there any counterpart to geolocation(html 5) in html 4. Was there any method of determining the user's location in html4? One more question that I have is how does the geolocation get the user's location, from the IP Address or something else?
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HTML5 地理定位将查找位置的实际方法留给浏览器/客户端来实现。它仅标准化了 Javascript API，网站可以通过该 API 从浏览器获取位置。浏览器可以使用实际的 GPS 硬件、附近 WiFi 点的已知位置、GSM 蜂窝塔三角测量或任何其他可以使用的东西。浏览器可能支持此标准化 API，而不支持统称为 HTML5 的任何其他部分。
在这个标准化之前，没有标准。有一些基于专有/插件的东西，例如 Google Gears，但它们从未被广泛采用或支持。查找客户端位置的最常见方法过去是，现在仍然是通过 IP 地址和将 IP 映射到已知位置的大型数据库。
HTML5 geolocation leaves the actual means of finding the location up to the browser/client to implement. It only standardizes the Javascript API by which a website can get the location from the browser. The browser may use actual GPS hardware, known locations of nearby WiFi spots, GSM cell tower triangulation or whatever else it can. Browsers may support this standardized API without supporting any of the other parts of what is collectively called HTML5.
Before this standardization, there was no standard. There were some proprietary/plugin based things like Google Gears, but they were never widely adopted or supported. The most common way to find a client's location was, and still is, through the IP address and large databases that map IPs to known locations.
您可以使用 json 调用此 http://ip-api.com/json。没有 GPS 的地理定位是通过托管和 wifi/gsm 小区的分辨率完成的...
you could use json call to this http://ip-api.com/json. geolocation without gps is done though resolution of hosting and wifi/gsm cells...