channel是不同的goroutine之間的通信機制。

一個goroutine通過channel給另外一個goroutine發送信息。

每個channel 都有一個特殊的類型，也就是channel可以發送的數據的類型

我們可以通過make創建一個channel如：

ch := make(chan int) 這就是創建了一個類型為int的channel

默認我們這樣創建的是無緩存的channel,當然我們可以通過第二個參數來設置容量

ch := make(chan int,10)

http://www.58pic.com/c/12208194
http://www.58pic.com/c/12208177
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