WKWebView，用于在iOS 10中知道DOM何时就绪的委托方法

import WebKit

class ViewController: UIViewController, WKNavigationDelegate {
    var webView: WKWebView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let webConfiguration = WKWebViewConfiguration()
        webView = WKWebView(frame: .zero, configuration: webConfiguration)
        webView.navigationDelegate = self
        view = webView
        
        let url = URL(string: "https://example.com")
        let request = URLRequest(url: url!)
        webView.load(request)
    }
    
    // 网页加载完成时调用
    func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
        // DOM已经就绪，可以进行相关操作
        // 在这里执行你的代码
    }
}