Axios发起HTTP请求时的先后执行顺序

书写如下代码时，日志输出的顺序不可控，可能是"you How are"，也可能是"you are How"

<script>
import axios from 'axios'
export default {
  created() {
    this.fn1()
    this.fn2()
    console.log('you')
  },

  methods: {
    fn1() {
      axios.get('https://random.dog/woof.json')
      .then(ret => {
        console.log('How')
      }).catch(e => {
        console.log(e)
      })

    },

    fn2() {
      axios.get('https://random.dog/woof.json')
      .then(ret => {
        console.log('are')
      }).catch(e => {
        console.log(e)
      })
    }

  }
}
</script>

如果希望日志输出顺序是"How are you"，方案1代码如下：

<script>
import axios from 'axios'
export default {
  name: 'App',
  async created() {
    await this.fn1()
    await this.fn2()
    console.log('you')
  },

  methods: {
    fn1() {
      return axios.get('https://random.dog/woof.json')
      .then(ret => {
        console.log('How')
      }).catch(e => {
        console.log(e)
      })

    },

    fn2() {
      return axios.get('https://random.dog/woof.json')
      .then(ret => {
        console.log('are')
      }).catch(e => {
        console.log(e)
      })
    }

  }
}
</script>

如果希望日志输出顺序是"How are you"，方案2代码如下：

<script>
import axios from 'axios'
export default {
  async created() {
    await this.fn1()
    await this.fn2()
    console.log('you')
  },

  methods: {
    async fn1() {
      const ret = await axios.get('https://random.dog/woof.json')
      console.log('How')
      console.log(ret.data)
    },

    async fn2() {
     const ret = await axios.get('https://random.dog/woof.json')
     console.log('are')
     console.log(ret.data)
    }

  }
}
</script>

原文地址：https://blog.csdn.net/u011690675/article/details/145279004

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