coroutineScope 与 runBlocking

1. runBlocking 是常规函数，而coroutineScope 是挂起函数
   2.它们都会等待期协程体以及所有子协程结束，主要区别在于runBlocking 方法会阻塞当前线程来等待，而coroutineScope 只是挂起，会释放底层线程用于其他用途

coroutineScope 与supervisorScope

1.coroutineScope ：一个协程失败了，所有其他兄弟协程也会被取消
2.supervisorScope：一个协程失败了，不会影响其他协程

coroutineScope ：

 val b = runBlocking {
    coroutineScope {
        val job1 = async {
            delay(1000)
            println("job1 finished")
        }
        val job2 = async {
            delay(500)
            println("job2 finished")
        }
    }

执行输出内容：
7905-7905 I/System.out: job2 finished
7905-7905 I/System.out: job1 finished

如果在执行过程中job2 出现异常协程被取消，那么job1的执行将会被取消

 val b = runBlocking {
    coroutineScope {
        val job1 = async {
            delay(1000)
            println("job1 finished")
        }
        val job2 = async {
            delay(500)
            println("job2 finished")
            throw IllegalArgumentException()
        }
    }

执行结果：
8670-8670 I/System.out: job2 finished

supervisorScope：

 val b = runBlocking {
    supervisorScope {
        val job1 = async {
            delay(1000)
            println("job1 finished")
        }
        val job2 = async {
            delay(500)
            println("job2 finished")
            throw IllegalArgumentException()
        }
    }

输出结果：
10776-10776 I/System.out: job2 finished
10776-10776 I/System.out: job1 finished