【Vue】基础（数据 & 计算属性 & 方法）

<template>
  <div>
    <p>source array:{{numbers}}</p>
    <p>sorted array:{{sortArray()}}</p>
    <p>3 in array index : {{findIndex(3)}}</p>
    <p>totalNumbers : {{totalNumbers}}</p>
    <button @click="changeArray()">修改数组</button>
  </div>
</template>

<script>
export default {
  data() {
    return { numbers: [1, 5, 3, 9, 2, 4, 8] };
  },
  computed: {
    totalNumbers() {
      console.log("compute total");
      return this.numbers.reduce((total, val) => total + val);
    }
  },
  methods: {
    sortArray() {
      return this.numbers.slice(0).sort((a, b) => a - b);
    },
    findIndex(value) {
      console.log("find index");
      return this.numbers.findIndex(m => m === value);
    },
    changeArray() {
      for (let i = 0; i < this.numbers.length; i++) {
        this.$set(this.numbers, i, Math.floor(Math.random() * 100));
      }
    }
  }
};
</script>

total:{
    get(){
        ....
    }
    set(){
        ...
    }
}