seleccionado en vue js ejemplo de código de cuadro de selección

Ejemplo 1: desplegable v-para vuehs

<select v-model="testVal">
    <option v-for="item in test" :value="item">{{item}}</option>
</select>

and in data

data() {
    return{
        test: ['one', 'two', 'three'],
        testVal: null
    }
}

Ejemplo 2: cómo manipular los datos de opciones de entrada múltiple en una función en vue js

<template>
  <select
    :class="$options.name"
    v-model="selected"
    @change="updateValue"
  >
    <option
      disabled
      value=""
      v-text="disabledOption"
    />
    <option
      v-for="option in options"
      :key="option"
      :value="option"
      v-text="option"
    />
  </select>
</template>

<script>
export default {
  name: 'FormSelect',
  model: {
    // By default, `v-model` reacts to the `input`
    // event for updating the value, we change this
    // to `change` for similar behavior as the
    // native `<select>` element.
    event: 'change',
  },
  props: {
    // The disabled option is necessary because
    // otherwise it isn't possible to select the
    // first item on iOS devices. This prop can
    // be used to configure the text for the
    // disabled option.
    disabledOption: {
      type: String,
      default: 'Select something',
    },
    options: {
      type: Array,
      default: () => [],
    },
    value: {
      type: [String, Number],
      default: null,
    },
  },
  data() {
    return {
      selected: this.value,
    };
  },
  methods: {
    updateValue() {
      // Emitting a `change` event with the new
      // value of the `<select>` field, updates
      // all values bound with `v-model`.
      this.$emit('change', this.selected);
    },
  },
};
</script>

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