字符串的常用处理，删除，替换。记录一下，方便查找。
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- (void)viewDidLoad {
[super viewDidLoad];
NSString *str1 = @"&hello,wo
//删除字符串两端的尖括号
NSMutableString *mString = [NSMutableString stringWithString:str1];
//第一个参数是要删除的字符的索引，第二个是从此位开始要删除的位数
[mString deleteCharactersInRange:NSMakeRange(0, 1)];
[mString deleteCharactersInRange:NSMakeRange(mString.length-1, 1)];
NSLog(@"mString:%@",mString);
//删除字符串中的空格
NSString *str2 = [mString stringByReplacingOccurrencesOfString:@" " withString:@""];
NSLog(@"str2:%@",str2);
//同样的可以替换字符
NSString *str3 = [str2 stringByReplacingOccurrencesOfString:@"," withString:@"好"];
NSLog(@"str3:%@",str3);
//替换某一位置的字符
NSString *str4 = [str3 stringByReplacingCharactersInRange:NSMakeRange(0, 1) withString:@"哈哈"];
NSLog(@"str4:%@",str4);
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