必须这样写，如果用vue可以在app.vue里面写，先把WebViewJavascriptBridge弄到window下面
function setupWebViewJavascriptBridge(callback) {
if ((window as any).WebViewJavascriptBridge) { return callback((window as any).WebViewJavascriptBridge); }
if ((window as any).WVJBCallbacks) { return (window as any).WVJBCallbacks.push(callback); }
(window as any).WVJBCallbacks = [callback];
var WVJBIframe = document.createElement('iframe');
WVJBIframe.style.display = 'none';
WVJBIframe.src = 'https://__bridge_loaded__';
document.documentElement.appendChild(WVJBIframe);
setTimeout(function () { document.documentElement.removeChild(WVJBIframe) }, 0)
}
setupWebViewJavascriptBridge(function (bridge) {
// window.JSBridge = bridge;
})
具体用的时候
js调用native（原生的，ios或者安卓端）
(window as any).WebViewJavascriptBridge?.callHandler(native端的方法名, {参数}, (返回值) => {})
native调用js的
(window as any).WebViewJavascriptBridge?.registerHandler(native端的方法名, (返回值) => {})