需要遵守<WKNavigationDelegate>并实现以下代理方法

-(void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler
{
    //如果是跳转一个新页面
    if (navigationAction.targetFrame == nil) {
        [webView loadRequest:navigationAction.request];
    }
    
    decisionHandler(WKNavigationActionPolicyAllow);
}