h5 mutual method call at the webview ios

function setupWebViewJavascriptBridge(callback) {
  if (window.WebViewJavascriptBridge) {
    return callback(window.WebViewJavascriptBridge)
  }
  if (window.WVJBCallbacks) {
    return window.WVJBCallbacks.push(callback)
  }
  window.WVJBCallbacks = [callback]
  let WVJBIframe = document.createElement('iframe');
  WVJBIframe.style.display = 'none'
  WVJBIframe.src = 'https://__bridge_loaded__'
  document.documentElement.appendChild(WVJBIframe);
  setTimeout(() => {
    document.documentElement.removeChild(WVJBIframe)
  }, 0)
}
export default {
  callhandler(name, data, callback) {//用于调用ios的原生方法
    setupWebViewJavascriptBridge(function (bridge) {
      bridge.callHandler(name, data, callback)
    })
  },
  registerhandler(name, callback) {//用于注册js方法，供给ios调用
    setupWebViewJavascriptBridge(function (bridge) {
      bridge.registerHandler(name, function (data, responseCallback) {
        callback(data, responseCallback)
      })
    })
  }
}