解决表格报错toggleRowSelection，Cannot read properties of undefined (reading ‘toggleRowSelection‘)

可以使用nextTick+setTimeout

this.$nextTick(() => {
        // 确保组件已加载后再调用toggleRowSelection
        setTimeout(()=> {
          if (this.$refs.tablePolicy) {
            this.selectRow.forEach((row) => {
              this.$refs.tablePolicy.toggleRowSelection(row,true);
            })
          }
        }, 300);
      });