//配置 WebView，让OC和JS可以互调。
- (void)configTheJSContext {
    self.context = [self.webView valueForKeyPath:(NSString *)WebViewKeyPath];
    JavaScriptObj *javaScript = [[JavaScriptObj alloc] init];  //自定义一个类来管理需要被JS调用的函数
    self.context[(NSString *)JavaScriptCallNativeObj] = javaScript;
}

//OC调用JS，传入JS的函数名，所需参数依次组成的数组
- (JSValue *)letOCCallJSWithFunName:(NSString *)funName andArguments:(NSArray *)argumentsArray inJSContext:(JSContext *)jsContext {
    JSValue *function = [jsContext objectForKeyedSubscript:funName];
    JSValue *result = [function callWithArguments:argumentsArray];
    return result;
}

//进行单次定位请求
- (void)startLocationAction {

    [self cleanUpAction];

    self.loadingView.hidden = NO;

    __weak typeof(self) weakSelf = self;
    [self.locationManager requestLocationWithReGeocode:NO completionBlock:^(CLLocation *location, AMapLocationReGeocode *regeocode, NSError *error) {

        weakSelf.loadingView.hidden = YES;

        if (error) {

            NSLog(@"locError:{%ld - %@};", (long)error.code, error.localizedDescription);
            //如果为定位失败的error，则不进行后续操作
            if (error.code == AMapLocationErrorLocateFailed) {
                return;
            }
        }

        //得到定位信息后，调用JS函数addMarker，需要两个参数，经度和纬度，组成数组传入，其他函数详见map.html
        if (location) {
            [weakSelf letOCCallJSWithFunName:@"addMarker" andArguments:@[[NSNumber numberWithDouble:location.coordinate.longitude],[NSNumber numberWithDouble:location.coordinate.latitude]] inJSContext:self.context];
        }
    }];
}