vue2.0 之计算属性和数据监听

计算属性computed

<template>
  <div>
    <input type="text" name="" v-model="myVal"><br/>
    {{ myValueWithoutNum }}<br/>
    {{ getMyValueWithoutNum() }}<br/>
  </div>
</template>

<script>
  export default {
    data () {
      return {
        myVal: ‘‘
      }
    },
    computed: {
      myValueWithoutNum () {
        return this.myVal.replace(/\d/g, ‘‘)
      }
    },
    methods: {
      getMyValueWithoutNum () {
        return this.myVal.replace(/\d/g, ‘‘)
      }
    }
  }
</script>

<style>
  html {
    height: 100%;
  }
</style>

上例中myValueWithoutNum是计算属性，getMyValueWithoutNum()是方法调用。

数据监听watch

<template>
  <div>
    <input type="text" name="" v-model="myVal"><br/>
  </div>
</template>

<script>
  export default {
    data () {
      return {
        myVal: ‘‘
      }
    },
    watch: {
      myVal (val, oldval) {
        console.log(val, oldval)
      }
    }
  }
</script>

<style>
  html {
    height: 100%;
  }
</style>