設(shè)置WKWebViewConfiguration

    NSString *jScript = @"var meta = document.createElement('meta'); meta.setAttribute('name', 'viewport'); meta.setAttribute('content', 'width=device-width'); document.getElementsByTagName('head')[0].appendChild(meta);";
    WKUserScript *wkUScript = [[WKUserScript alloc] initWithSource:jScript injectionTime:WKUserScriptInjectionTimeAtDocumentEnd forMainFrameOnly:YES];

    WKUserContentController *wkUController = [[WKUserContentController alloc] init];

    [wkUController addUserScript:wkUScript];
    WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init];
    config.userContentController = wkUController;

在WKWebView加載完成的方法中調(diào)用

- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation{
    MJWeakSelf
    [webView evaluateJavaScript:@"document.body.scrollHeight"completionHandler:^(id _Nullable result,NSError * _Nullable error){
        int height = [result floatValue];
        NSLog(@"scrollHeight高度：%.2f",[result floatValue]);
    }];
}