import "ViewController.h"
typedef void(^finished)(NSString *html);
@interface ViewController ()
@property (nonatomic, copy) finished block;
@property (nonatomic, copy) void(^block2)(NSString *html);
@end
@implementation ViewController
-(void)load:(void(^)(NSString *html))finished{
finished(@"第一种用法");
self.block(@"第二种用法");
self.block2(@"第三种用法");
}