关于WebView JS代码最早注入时机的咨询

extendtypescript 
let javaScript = `window.umapStartParams = ${this.params.startParamsString};`; 
javaScript += 'window.UMJSBridge = { callHandler(name, params, callback) { window.JSBridge.call(name, params, callback) } };'; 
javaScript += 'document.dispatchEvent(new Event("UMJSBridgeReady"));'; 
const configMap = UMWebManager.getConfigMap(); 
if (!configMap.has('doubleTrack') || configMap.get('doubleTrack') === true) { 
  javaScript += `window.AlipayJSBridge = { call(name, params, callback) { window.JSBridge.call(name, params, callback)}, startupParams: ${this.params.startParamsString} };`; 
  javaScript += 'document.dispatchEvent(new Event("AlipayJSBridgeReady"));'; 
} 
this.controller.runJavaScript(javaScript);
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