问题：页面刷新后第一个input可以聚焦，第二个以后不能聚焦

解决方案:

<span v-if="visible" @dblclick="editContent" class="machine-info">{{variableInfo}}</span>
<el-input v-else size="mini" ref="textInput" v-model="variableInfo" @keyup.enter.native="confirmEdit"
          @blur="confirmEdit"></el-input>

name: 'EditCell',
props: {
  value: {}
},
watch: {
  value () {
    this.copyValue()
  }
},
data () {
  return {
    item:{
      textInput:''
    },
    visible: true,
    variableInfo: '',
  }
},
mounted () {
  this.copyValue()
},
methods: {
  copyValue () {
    this.variableInfo = this.value
  },
  editContent () {
    this.visible = false
    this.$nextTick(()=>{
      if(this.$refs.textInput){
        this.$refs.textInput.focus()
      }
    })

  },
  confirmEdit () {
    this.visible = true
    this.$emit('input', this.variableInfo)
  }
},

}
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