code: function setupWebViewJavascriptBridge(callback) {
      if (window.WebViewJavascriptBridge) { return callback(WebViewJavascriptBridge); }
      if (window.WVJBCallbacks) { return window.WVJBCallbacks.push(callback); }
      window.WVJBCallbacks = [callback];
      var WVJBIframe = document.createElement('iframe');
      WVJBIframe.style.display = 'none';
      WVJBIframe.src = 'wvjbscheme://__BRIDGE_LOADED__';
      document.documentElement.appendChild(WVJBIframe);
      setTimeout(function() { document.documentElement.removeChild(WVJBIframe) }, 0)
    }
docs: ============ device init operation start =========== /* setup WebView Javascript Bridge for ios , ios 初始化