2 - JSBinding Call Native Code via Block
#import <JavaScriptCore/JavaScriptCore.h>
之前一章已经看过JS和Block的互动
NSInteger nNumber = 9; NSString *strOut = @"abc"; context[@"sum"] = ^(int a,int b) { NSLog(@"strOut = %@",strOut); return a+b+nNumber; }; result = [context evaluateScript:@"sum(1,2);"]; NSLog(@"sum2 = %f",[result toDouble]);
打印结果
2015-01-28 16:23:24.453 JSBinding[5121:60b] strOut = abc
2015-01-28 16:23:24.454 JSBinding[5121:60b] sum2 = 12.000000
你会发现在Block中是调用,Block以外的变量从而满足你的一些特定需求。
如果你在Block中直接调用context是有问题的,如果我们要用
JSContext *ctx = [JSContext currentContext];
当然ctx是等同Block中的context的