基础知识

//变量常量
var abc = 100;
let bcd = 100;
println(abc);
println(bcd);

输出：
100
100

//字符串连接
var str = "hello";
str = str + " 你好";
str = "\(str) \(100)";
println(str);

输出：
hello 你好 100

//定义数组
var arr = [100,"sdfsd",3231,2.5];
var aa = [];
var bb = [String]();
println(arr);

输出：
(
    100,
    sdfsd,
    3231,
    "2.5"
)

//定义字典(不加Dictionary会报错)
var dic:Dictionary = ["name":"Jonh","age":16];
dic["age"] = 33;
println(dic["age"]);
println(dic);

输出：
Optional(33)
[name: Jonh, age: 33]

//for循环
var ss = [String]()
for index in 0...10
{
    ss.append("item\(index)");
}
println(ss)

输出：
[item0, item1, item2, item3, item4, item5, item6, item7, item8, item9, item10]