效果：在div中实现el-loading

 <div class="content-main">{{ hotList }}</div>getHotList(columnType) {this.$nextTick(() => {var loading = this.$loading({lock: true,text: "努力加载中...",spinner: "el-icon-loading",background: "rgba(0, 0, 0, 0.5)",target: document.querySelector(".content-main")  // 替换成你的类名});try {getPolicyList({columnType, pageNum: 1, pageSize: 10}).then(res15 => {this.hotList = res15.data.rows}).finally(() => {loading.close();})} catch (error) {console.error(error);}})},