Koa2 異步async

1:模擬異步示例 routes/index.js
示例一：

router.get('/testAsync', async (ctx) => {
  global.console.log('start', new Date().getTime())
  const a = await new Promise((resolve, reject) => {
    setTimeout(function () {
      global.console.log('async a', new Date().getTime())
      resolve('a')
    }, 1000)
  })
  ctx.body = {
    a
  }
})

示例二：

router.get('/testAsync', async (ctx) => {
  global.console.log('start', new Date().getTime())
  const a = await new Promise((resolve, reject) => {
    setTimeout(function () {
      global.console.log('async a', new Date().getTime())
      resolve('a')
    }, 1000)
  })
  const c = await new Promise((resolve, reject) => {
    setTimeout(function () {
      global.console.log('async c', new Date().getTime())
      resolve('c')
    }, 1000)
  })
  const b = await '12'
  ctx.body = {
    a,
    b,
    c
  }
})

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