在使用WKWebView和js交互时，会发现不走dealoc方法，也就是没有释放。经查，问题出现在注册方法那行代码，eg:

[config.userContentController addScriptMessageHandler:self name:@"close"];

config是生成WKWebView需要的配置类WKWebViewConfiguration，它注册方法是会对self引用，而我是吧WkWebView作为一个属性，这样就发生了循环引用，

界面办法发是生成一个代理类,名字为：WeakScriptMessageDelegate

WeakScriptMessageDelegate.h

#import <Foundation/Foundation.h>
#import <WebKit/WebKit.h>
@interface WeakScriptMessageDelegate : NSObject<WKScriptMessageHandler>

@property (nonatomic, weak) id<WKScriptMessageHandler> scriptDelegate;

- (instancetype)initWithDelegate:(id<WKScriptMessageHandler>)scriptDelegate;

@end

WeakScriptMessageDelegate.m

#import "WeakScriptMessageDelegate.h"

@implementation WeakScriptMessageDelegate

- (instancetype)initWithDelegate:(id<WKScriptMessageHandler>)scriptDelegate {
    self = [super init];
    if (self) {
        _scriptDelegate = scriptDelegate;
    }
    return self;
}

- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message {
    [self.scriptDelegate userContentController:userContentController didReceiveScriptMessage:message];
}


@end

将代码

[config.userContentController addScriptMessageHandler:self name:@"close"];

改成

[config.userContentController addScriptMessageHandler:[[JFTWeakScriptMessageDelegate alloc] initWithDelegate:self] name:@"close"];

即可。