w3c中html的绝对位置,html-被W3C地理位置示例代码所迷惑-如果找不到位置,它将无限循环吗？...

我有点担心W3C Geolocation spec中此代码示例的安全性：

// Forcing the user agent to return a fresh cached position.

// Request a position. We only accept cached positions whose age is not

// greater than 10 minutes. If the user agent does not have a fresh

// enough cached position object, it will immediately invoke the error

// callback.

navigator.geolocation.getCurrentPosition(successCallback,

errorCallback,

{maximumAge:600000, timeout:0});

function successCallback(position) {

// By using the 'maximumAge' option above, the position

// object is guaranteed to be at most 10 minutes old.

// By using a 'timeout' of 0 milliseconds, if there is

// no suitable cached position available, the user agent

// will aynchronously invoke the error callback with code

// TIMEOUT and will not initiate a new position

// acquisition process.

}

function errorCallback(error) {

switch(error.code) {

case error.TIMEOUT:

// Quick fallback when no suitable cached position exists.

doFallback();

// Acquire a new position object.

navigator.geolocation.getCurrentPosition(successCallback, errorCallback);

break;

case ... // treat the other error cases.

};

}

function doFallback() {

// No fresh enough cached position available.

// Fallback to a default position.

}

如果浏览器确实由于某种原因无法返回位置修复,并且持续超时,会发生什么情况？

当然,代码将最终陷入无限循环,并一遍又一遍地调用errorCallback.

我看到了doFallback()调用,但这不会阻止errorCallback被重复调用.还是会？