是否可以在iOS上的微信内置浏览器中定位用户代理字符串？

我发现我有针对微信（微信）的JS API，所以我已经编辑了答案：http ://mp.weixin.qq.com/qa/index.php?qa=search&q= weixinjsbridge

长故事短，您只需将其添加到您的js中：

document.addEventListener('WeixinJSBridgeReady', function onBridgeReady() { 
    // bridge initialized, meaning we're in WeChat, not stand-alone browser...
}, false);

还有一些API可以随时共享并与特定的朋友共享，并在成功共享时获取回调。

聚苯乙烯

刚刚发现，在iOS微信上，桥接的初始化方式比在Android上更快，因此此回调从未调用，因为在初始化桥接后添加了侦听器。

因此，为了完成答案，以下是正确执行的方法：

// when your webapp is loaded, before adding listener for weixing js bridge, check if it's already initialized:
var timeoutID = 0;
if( typeof WeixinJSBridge !== "undefined" )
{
    // WeChat JS bridge already initialized. Wonderful.
}
else
{
    // setup a time out of let's say 5 seconds, to wait for the bridge:
    timeoutID = window.setTimeout(WeChatBridgeTimeout,5000);
    // now add listener for the bridge:
    document.addEventListener('WeixinJSBridgeReady', WeChatBridgeReady, false);
}

// Now in bridge time out:
function WeChatBridgeTimeout()
{
     // Just to be sure that bridge was not initialized just before the line we added the listener (since it's a separate process than JS), let's check for it again:
      if( typeof WeixinJSBridge !== "undefined" )
      {
           // WeChat JS bridge already initialized. Wonderful.
      }
      else
      {
           // Nope... if it's not initialized by now, we're not in WeChat.
      }
}

// And in event handled:
function WeChatBridgeReady()
{
     // remove listener timeout
     window.clearTimeout(timeoutID);
     // WeChat JS bridge initialized.
}