iOS WKWebView 退出后停止播放音频/视频

带有<video>或者<audio>标签的H5网页在播放音频视频时，退出webview后不会自动停止播放，手动处理一下。

1.注入使网页停止音频、视频播放的JS代码(Swift 4)：

         let pauseJSString:String =
 """
 var videos = document.getElementsByTagName("video");
         function pauseVideo(){
             var len = videos.length
             for(var i=;i<len;i++){
                 videos[i].pause();
             }
         }
         var audios = document.getElementsByTagName("audio");
         function pauseAudio(){
             var len = audios.length
             for(var i=;i<len;i++){
                 audios[i].pause();
             }
         }
 """
         let pauseJS:WKUserScript = WKUserScript.init(source: pauseJSString, injectionTime: WKUserScriptInjectionTime.atDocumentStart, forMainFrameOnly: true)

         let userContentCtrl:WKUserContentController = WKUserContentController.init()
         userContentCtrl.addUserScript(pauseJS)
         conf.userContentController = userContentCtrl

         webView = WKWebView.init(frame: CGRect.zero, configuration: conf)

2.退出前，调用暂停播放的JS函数(Swift 4)：

    override func viewDidDisappear(_ animated: Bool) {
        super.viewDidDisappear(animated)

        pausePlay()
    }

    /// 暂停播放网页内的音频、视频
    func pausePlay(){
        mWebView.evaluateJavaScript("pauseVideo()") { (data, error) in
        }
        mWebView.evaluateJavaScript("pauseAudio()") { (data, error) in
        }
    }

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