需求

需要一个iput框输入，离焦或回车后生成一个标签，提交时判断符不符合规则

思路

input框的值不能为数组，所以用一个div设置样式模拟输入框，隐藏输入框的样式；前半段循环显示tag, 利用@keyup.enter="addTags" （回车）和@blur="addTags"（离焦）添加tag, 规则判断需要用到循环；

缺点

在输入值时未验证，需改进

代码

<template>
    <div style="width:800px">
      <el-form ref="form" :model="form" label-width="120px"  :rules="rule">
        <el-form-item label="白名单"  prop="allowedHosts">
          <div class="contaion" @click="onclick">
    <!-- 生成的标签 -->
    <div v-for="(item, index) in form.allowedHosts" :key="index" class="spanbox">
      <span class="tagspan">{{ item }}</span>
      <i class="iClose" @click="removeTag(item,index)"></i>
    </div>
    <!-- 输入框 -->
    <input
       v-model="form.inputValue"
      @keyup.enter="addTags"
      @blur="addTags"
      :style="inputStyle"
      class="inputTag"
      ref="inputTag"
      type="text"
    />
  </div>
  
        </el-form-item>
        <el-form-item>
            
            </el-form-item>
        <el-form-item>
          <el-button type="primary" @click="onSubmit">保存</el-button>
          <el-button>取消</el-button>
        </el-form-item>
      </el-form>
     
 
      </div>
  </template>
  
  <script>
  export default {
    props:{
        allowedHosts:{
         type:Object,
      }
    },
    
    data(){
        var validIp = (rule, value, callback) => {
            var ipreg = /((2(5[0-5]|[0-4]\d))|[0-1]?\d{1,2})(\.((2(5[0-5]|[0-4]\d))|[0-1]?\d{1,2})){3}/;
            if (value.length > 0) {
                let flag = true;
                value.forEach(item => {
                     if (item != "*" && !ipreg.test(item) ) {
                        flag = false;
                    }
                })
                if (!flag) {
                    callback(new Error("白名单中含有错误的IP地址，请重新输入"));
                } else {
                    callback();
                }
            }else{
                callback(new Error("请输入白名单"));
            }
            
    };
      return{
        form:{
            allowedHosts:[],  //tag
            inputValue: "",        //输入框
        },
      //输入框宽度
      inputLength: "",
      //计算删除位置
      n: 0,
        rule:{
            allowedHosts:[{required:true,message:'请输入需要加入白名单的主机',trigger:'change'},
           { required: true, validator: validIp, trigger: "change" }],
        }
      }
    },
    watch: {
    //监听输入的值越多，输入框越长
    "form.inputValue"(val) {
      // 实时改变input输入框宽度，防止输入内容超出input默认宽度显示不全
      this.inputLength = this.$refs.inputTag.value.length * 12 + 50;
    },
  },
  computed: {
    //计算属性：计算出动态输入框宽度
    inputStyle() {
      let style = {};
      style.width = `${this.inputLength}px`;
      return style;
    }
  },
    methods:{
      
      //点击叉叉删除tag
    removeTag(item,index) {
      this.form.allowedHosts.splice(index, 1);
     },
 
    //回车增加tag
    addTags() {
      //新增函数中可以加一些你所需要的校验规则。比如只能是数子，或者不能输入‘，’等
      if (this.form.inputValue) {
         //添加tag
          this.form.allowedHosts.push(this.form.inputValue);
          //清空输入框
          this.form.inputValue = "";
      }
    },
    //点击父盒子输入框获取焦点
    onclick() {
      this.$nextTick(() => {
        this.$refs.inputTag.focus();
      })
    }
 
    }
  }
  </script>
  
  <style  scoped>
  .contaion {
  width: 600px;
  box-sizing: border-box;
  background-color: white;
  border: 1px solid #409EFF;
  border-radius: 4px;
  font-size: 12px;
  text-align: left;
  padding-left: 5px;
  word-wrap: break-word;
  overflow: hidden;
}
/* 标签 */
.spanbox {
  display: inline-block;
  font-size: 14px;
  margin: 3px 4px 3px 0;
  background-color: #ecf5ff;
  border: 1px solid #e8eaec;
  border-radius: 3px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, .12), 0 0 6px rgba(0, 0, 0, .04)
}
/* 标签文字 */
.tagspan {
  height: 24px;
  line-height: 22px;
  max-width: 99%;
  position: relative;
  display: inline-block;
  padding-left: 8px;
  color: #409EFF;
  font-size: 14px;
  opacity: 1;
  vertical-align: middle;
  overflow: hidden;
  transition: 0.25s linear;
}
/* tag的叉叉 */
.iClose {
  padding: 0 6px 0 4px;
  opacity: 1;
  -webkit-filter: none;
  filter: none;
  color: #409EFF;
  /* font-weight: 600; */
  cursor:pointer;
}
/* 鼠标经过叉叉 */
.iClose:hover{
  background-color: #409EFF;
  border-radius: 50%;
  color: #fff;
}
.iClose:after {
  content: "\00D7";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  /* line-height: 27px; */
  transition: 0.3s, color 0s;
}
/* input */
.inputTag {
  font-size: 16px;
  border: none;
  box-shadow: none;
  outline: none;
  background-color: transparent;
  padding: 0;
  width: auto;
  min-width: 150px;
  vertical-align: top;
  height: 32px;
  color: #495060;
  line-height: 32px;
}
/* 输入框提示文字大小 */
input:placeholder-shown {
font-size: 10px;
}
 
  </style>

结果

image.png