在Vue中去抖动计算的属性/ getter

Question

我似乎无法去抖(lodash)计算属性或vuex getter.去抖动的函数总是返回undefined.

https://jsfiddle.net/guanzo/yqk0jp1j/2/

HTML:

<div id="app">
  <input v-model="text">
  <div>computed: {{ textComputed }} </div>
  <div>debounced: {{ textDebounced }} </div>
</div>

JS:

new Vue({
    el:'#app',
  data:{
    text:''
  },
  computed:{
    textDebounced: _.debounce(function(){
      return this.text
    },500),
    textComputed(){
        return this.text
    }
  }

})

Answer 1

正如我在评论中提到的,debouncing是一种固有的异步操作,因此无法返回值.根据您的需要,您可能希望在输入端进行去抖动.值in text和in 之间没有区别textComputed,但是如果你v-model="textComputed",值设置将被去抖.

如果你特别想要一个debounced版本的变量,mrogers给出了一个很好的解决方案.

var x = new Vue({
  el: '#app',
  data: {
    text: 'start'
  },
  computed: {
    textComputed: {
      get() {
        return this.text;
      },
      set: _.debounce(function(newValue) {
        this.text = newValue;
      }, 500)
    }
  }
})

<script src="//cdnjs.cloudflare.com/ajax/libs/vue/2.3.4/vue.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.js"></script>
<div id="app">
  <div>
    Debounced input:
    <input v-model="textComputed">
  </div>
  <div>
    Immediate input:
    <input v-model="text">
  </div>
  <div>computed: {{ textComputed }} </div>
  <div>debounced: {{ text }} </div>
</div>

Answer 2

我不知道为什么去抖动函数不适用于计算属性。然而，另一种解决方案是将去抖放在该部分中的函数上methods并通过watch.

https://jsfiddle.net/vsc4npv3/

HTML：

<div id="app">
<input v-model="text">
<div>computed: {{ textComputed }} </div>
<div>debounced: {{ debouncedText }} </div>
</div>

JavaScript：

var x = new Vue({
    el:'#app',
  data:{
    text:'',
    debouncedText: ''
  },
  watch: {
    text: function (val) {
        this.debouncer();
    }
  },
  computed:{
    textComputed(){
        return this.text;
    }
  },
  methods: {
    debouncer: _.debounce(function(){
      this.debouncedText = this.text;
    },500)
  }

})