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                [TOC] ## **一:channel的關閉** 使用內置函數close可以關閉channel,當channel關閉后,就不能在向channel寫入數據了,但是任然可以從該channel讀取數據 ![](https://img.kancloud.cn/1f/bc/1fbcd67bbb88474346dda823d9eb375a_1209x441.png) **運行結果** ``` panic: send on closed channel goroutine 1 [running]: main.main() /Users/wang/go/src/awesomeProject/lianxi/main/channel_demo10_lianxi06.go:11 +0xb5 ``` 很顯然不能寫入了,報了panic: send on closed channel **下面我們嘗試讀取** ![](https://img.kancloud.cn/31/ab/31aba77ac694bfe441241856e4bbcd6a_1209x526.png) **運行結果** ``` sum = 1000 sum1 = 100 ``` <br> <br> ## **二:channel的遍歷** channel支持for——range的方式進行遍歷,請注意兩個細節 * 在遍歷時,如果channel沒有關閉,則回出現deadlock的錯誤 * 在遍歷時,如果channel已經關閉,則會正常遍歷數據,遍歷完后,就會退出遍歷。 ![](https://img.kancloud.cn/2a/9e/2a9e995b3e368ceb50535ebee6bc5308_1209x484.png)
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