<el-tag
 :key="tag"
 v-for="tag in dynamicTags"
 closable
 :disable-transitions="false"
 @close="handleClose(tag)">
 {{tag}}
</el-tag>
<el-input
 class="input-new-tag"
 v-if="inputVisible"
 v-model="inputValue"
 ref="saveTagInput"
 size="small"
 @keyup.enter.native="handleInputConfirm"
 @blur="handleInputConfirm"
>
</el-input>
<el-button v-else class="button-new-tag" size="small" @click="showInput">+ New Tag</el-button>

<style>
 .el-tag + .el-tag {
  margin-left: 10px;
 }
 .button-new-tag {
  margin-left: 10px;
  height: 32px;
  line-height: 30px;
  padding-top: 0;
  padding-bottom: 0;
 }
 .input-new-tag {
  width: 90px;
  margin-left: 10px;
  vertical-align: bottom;
 }
</style>

<script>
 export default {
  data() {
   return {
    dynamicTags: ['标签一', '标签二', '标签三'],
    inputVisible: false,
    inputValue: ''
   };
  },
  methods: {
   handleClose(tag) {
    this.dynamicTags.splice(this.dynamicTags.indexOf(tag), 1);
   },

   showInput() {
    this.inputVisible = true;
    this.$nextTick(_ => {
     this.$refs.saveTagInput.$refs.input.focus();
    });
   },

   handleInputConfirm() {
    let inputValue = this.inputValue;
    if (inputValue) {
     this.dynamicTags.push(inputValue);
    }
    this.inputVisible = false;
    this.inputValue = '';
   }
  }
 }
</script>

.el-tag{
 margin-right: 10px;
}
.el-tag + .el-tag {
  margin-right: 10px;
 }
 .button-new-tag {
  height: 32px;
  line-height: 30px;
  padding-top: 0;
  padding-bottom: 0;
 }
 .input-new-tag {
  vertical-align: bottom;
 }

handleInputConfirm() {
 let inputValue = this.inputValue;
  if (inputValue) {
   var values = inputValue.split(/[,， \n]/).filter(item=>{
    return item!='' && item!=undefined
   })
   values.forEach(element => {
    var index = this.dynamicTags.findIndex(i=>{
    return i==element
   })
   if(index<0){
    this.dynamicTags.push(element);
   }
  });   
 }
 this.inputVisible = false;
 this.inputValue = '';
}