js的Object.assign坑

<template>
  <div>
    <el-form>
      <el-form-item>
        <el-input v-model="user.name"></el-input>
        <el-input v-model="user.age"></el-input>
        <el-input v-model="user.gender"></el-input>
        <el-button type="primary" @click="toYoung">点我</el-button>
      </el-form-item>
    </el-form>
  </div>
</template>
<script>
export default {
  data() {
    return {
      user: {name: "achao", age: 20},
      info: {name: "ruben", age: 18, gender: "男"}
    }
  },
  created() {
    console.log(this.$route)
  },
  methods: {
    toYoung() {
      Object.assign(this.user, {name: "ruben", age: 18, gender: "男"})
      console.log(this.user)
    }
  },
}
</script>

this.user = {
  ...this.user,
  ...{name: "ruben", age: 18, gender: "男"}
}