如何检查javascript在pyqt5中是否加载完毕？

from PyQt5.QtCore import QUrl
from PyQt5.QtWidgets import QApplication
from PyQt5.QtWebEngineWidgets import QWebEngineView, QWebEngineScript

def check_javascript_loaded():
    # 创建应用程序
    app = QApplication([])
    
    # 创建Web视图
    view = QWebEngineView()
    
    # 加载网页
    view.load(QUrl("http://example.com"))
    
    def load_finished_callback(success):
        if success:
            # 创建JavaScript脚本
            script = QWebEngineScript()
            script.setSourceCode("""
                if (document.readyState === "complete") {
                    true;
                } else {
                    false;
                }
            """)
            
            # 执行JavaScript脚本
            view.page().runJavaScript(script.sourceCode(), lambda result: print(result))
    
    # 连接loadFinished信号到槽函数
    view.loadFinished.connect(load_finished_callback)
    
    # 运行应用程序
    app.exec_()

check_javascript_loaded()