vue2.6.11 数组push后界面不刷新

Question

一开始时候正常的，点击添加按钮，多做几次删除和保存操作，就有一定的概率出现添加按钮无效。实际数据已经push进去，只是不显示
我尝试过把getItemData()中的this.items = data || [];改成this.$set(this,"items",data)；在push之后调用this.$forceUpdate()也无效

完整代码如下

<template>
  <el-dialog
    v-el-drag-dialog
    class="small-padding"
    :visible.sync="dialogVisible"
    :close-on-click-modal="false"
    :title="model.name+'-对接企业'"
    width="500px"
    top="3vh">
    <div v-loading="contentLoading">
      <el-button type="primary" @click="addItem">添加</el-button>
      <el-form
        class="form"
        label-width="100px">
        <div v-for="(item,itemIndex) in items" :key="item.id||item.vueKey" style="display: flex;align-items: center">
          <div class="item">
            <el-form-item label="企业名称">
              <vm-select-input :value="item.companyName" @select="$refs.selectCom.open(null,item)"></vm-select-input>
            </el-form-item>
            <el-form-item
              v-for="(param,index) in item.params"
              :key="index"
              :label="param.key">
              <el-input v-model="param.value"></el-input>
            </el-form-item>
          </div>
          <div>
            <el-button type="danger" @click="deleteItem(itemIndex)">删除</el-button>
            <el-button
              type="primary"
              style="display: block;margin: 5px 0 0 0"
              @click="saveItem(item)">
              保存
            </el-button>
          </div>
        </div>
        <company-select ref="selectCom" @select="onSelectCom"></company-select>
      </el-form>
    </div>
  </el-dialog>
</template>

<script>
  import CompanySelect from "@/views/company/CompanySelect.vue";

  export default {
    components: {CompanySelect},
    data() {
      return {
        dialogVisible: false,
        contentLoading: false,
        model: {
          id: "",
          name: "",
          params: [],
          doc: "",
        },
        items: [],
      };
    },
    methods: {
      open(id) {
        this.model.id = id;
        this.dialogVisible = true;
        this.getData();
      },
      getData() {
        this.contentLoading = true;
        this.$http
          .get("integrations/" + this.model.id)
          .then(({data}) => {
            this.$assign(this.model, data);
            this.getItemData();
          });
      },
      getItemData() {
        this.contentLoading = true;
        this.$http
          .get("integrationItems?integrationId=" + this.model.id)
          .then(({data}) => {
            this.contentLoading = false;
            this.items = data || [];
          });
      },
      onSelectCom(row, item) {
        item.companyId = row.id;
        item.companyName = row.name;
      },
      addItem() {
        let params = this.model.params.map(item => {
          return {
            key: item,
            value: "",
          };
        });
        console.log(params);
        this.items.push({
          vueKey: this.$util.genKey(),
          integrationId: this.model.id,
          companyId: "",
          companyName: "",
          params: params,
        });
      },
      deleteItem(index) {
        let itemId = this.items[index].id;
        if (itemId) {
          this.$confirm("确定删除吗?", "提示", {type: "warning"}).then(() => {
            this.$http.delete("integrationItems", itemId).then(() => {
              this.$message.success("删除成功");
              this.getItemData();
            });
          });
        } else {
          this.items.splice(index, 1);
        }
      },
      saveItem(item) {
        this.$http.save("integrationItems", item).then(() => {
          this.$message.success("保存成功");
          this.getItemData();
        });
      },
    },
  };
</script>

<style lang="scss" scoped>
.form {
  margin-top: 5px;
}

.item {
  flex: 1;
  background-color: #fcfcfc;
  padding: 20px 15px 10px 10px;
  margin-bottom: 10px;
  border: 1px solid #e8e8e8;
  border-radius: 3px;
  margin-right: 5px;
}
</style>

Answer 1

this.items.push({
  vueKey: this.$util.genKey(),
  integrationId: this.model.id,
  companyId: "",
  companyName: "",
  params: params,
});

调整为

this.items = { ...this.items, {
  vueKey: this.$util.genKey(),
  integrationId: this.model.id,
  companyId: "",
  companyName: "",
  params: params,
}}

Answer 2

vue2.x 对于引用类型数据的监听，里面的参数一开始就要存在，否则后续添加的数据不会触发更新
但依然可以通过整体赋值的方式来改变， 例如：

let arr = [1, 2]
arr.push(3) // 不会触发更新
// 改成以下
arr = [...arr, 3]

vue3.x 使用的是proxy，可以精确监听引用类型，即使是后续添加的参数也能触发更新

Answer 3

重新赋值一下~

Answer 4

看下是不是genKey返回了重复的key，重复的只会显示一个，控制台应该也有提示