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)}function callhandler (name, data, callback) {  setupWebViewJavascriptBridge(function (bridge) {    bridge.callHandler(name, data, callback)  })}

callhandler(functionName: string, params: object, res => {})

registerhandler (name, callback) {  // 安卓  window[name] = res => {   let data = JSON.parse(res)   callback(data)  }  // IOS  setupWebViewJavascriptBridge(function (bridge) {    bridge.registerHandler(name, function (data, responseCallback) {      callback(data, responseCallback)    })  })}

window.HTTP_TEST.functionName()

window['functionName'] = res => {}