vue + iview 實現一個手機分段的提示框，知識點還沒總結

<template>
  <div :class="{'ivu-form-item-error':!valid && dirty && validated}">
    <div class="ivu-phone-input ivu-select  ivu-select-multiple ivu-select-default" @keydown.delete.prevent @click.stop>
      <input type="text" class="ivu-select-selection number-block"
             v-for="(item,index) in phoneLength" :key="index"
             :ref="numberRefName+index"
             @focus="handlerFocus"
             @input="handlerInput($event,index)"
             @keydown.delete.prevent="deleteNumber($event,index)"
             @keydown.left.prevent="changeInput(index - 1)"
             @keydown.right="changeInput(index + 1)"
      />
      <Icon type="ios-close-circle" class="clean-btn" @click="cleanValue"/>
    </div>
  </div>
</template>

<script>
  export default {
    data() {
      return {
        required: this.$attrs.hasOwnProperty('required'),
        phoneLength: 11,
        phoneReg: /^(13[0-9]|14[579]|15[0-3,5-9]|16[6]|17[0135678]|18[0-9]|19[89])\d{8}$/,
        numberRefName: 'numberBlock',
        validTimer: null,
        dirty: false,
        valid: false,
        validated: false,
      };
    },
    methods: {

      handlerFocus() {
        if (!this.dirty) {
          this.dirty = this.required ? true : false;
        }
      },

      handlerInput(e, index) {
        if (!e.target.value) {
          return;
        }
        this.dirty = true;
        let value = e.target.value.replace(/\D+/g, '');
        value = value ? value[0] : '';
        //合法值，切換下一個輸入框
        if (value.length) {
          this.changeInput(index + 1);
        }
        //#end
        e.target.value = value;
        this.debounceValidate();
      },
      changeInput(index) {
        if (index < 0 || index === this.phoneLength) return;
        const target = this.$refs[this.numberRefName + index][0];
        target.focus();
        if (target.value && target.setSelectionRange) {
          target.setSelectionRange(1, 1);//maxlength="1" 時無效，所以去掉了...
        }
      },
      deleteNumber(e, index) {
        if (e.target.value) {
          e.target.value = ''
        } else {
          this.changeInput(index - 1);
        }
      },
      resetStatus() {
        this.validated = false;
        this.dirty = false;
      },
      cleanValue() {
        this.resetStatus();
        const numberBlocks = this.$refs;
        for (let i in numberBlocks) {
          numberBlocks[i][0].value = '';
        }
        if (this.required) {
          const FormItem = this.getFormItem();
          if (FormItem) {
            FormItem.resetField();
            FormItem.$emit('on-form-change', null);
          }
        }
        // this.changeInput(0);
      },
      debounceValidate() {
        this.validTimer = setTimeout(() => {
          this.validate();
        }, 300);
      },
      validate(isLeave) {
        const numberBlocks = this.$refs;
        let result = '';
        for (let i in numberBlocks) {
          result += numberBlocks[i][0].value;
        }
        if (result.length === this.phoneLength || isLeave) {
          this.validated = true;
          this.dispath({
            value: result,
            valid: this.valid = this.phoneReg.test(result),
          });
        }
      },
      dispath(info) {
        this.$emit('input', info.valid ? info.value : '');
        if (this.required) {
          const FormItem = this.getFormItem();
          if (FormItem) {
            this.updateFormItem(FormItem, info.valid ? info.value : '');
          }
        }
      },
      getFormItem() {
        let MAX_LEVEL = 3;
        let parent = this.$parent;
        let name = parent.$options.name;
        while (MAX_LEVEL && name !== 'FormItem') {
          MAX_LEVEL--;
          if (!parent) return null;
          parent = parent.$parent;
        }
        return parent || null;
      },
      updateFormItem(FormItem, data) {
        FormItem.$emit('on-form-change', data);
      },
      pageEvent() {
        if (this.dirty) {
          this.validate(true);
        }
      },
    },
    created() {
      window.addEventListener('click', this.pageEvent);
    },
    beforeDestroy() {
      window.removeEventListener('click', this.pageEvent);
    },
  };
</script>

<style scoped lang="less">
  .ivu-phone-input {
    .clean-btn {
      transition: opacity .5s;
      opacity: 0;
      cursor: pointer;
    }
    &:hover {
      .clean-btn {
        opacity: 1;
      }
    }
  }

  .number-block {
    display: inline-block;
    padding: 0;
    height: 30px;
    width: 28px;
    text-align: center;
    margin-right: 2px;
    &:nth-child(3) {
      margin-right: 10px;
    }
    &:nth-child(7) {
      margin-right: 10px;
    }
  }
</style>