vue树形菜单无限渲染

tree_for(tree_chil) {

      //最外层渲染

      for (let i = 0; i < tree_chil.length; i++) {

        let arr = {};

        arr.label = tree_chil[i].branchName;

        arr.branchId = tree_chil[i].branchId;

        if (tree_chil[i].childrens.length > 0) {

          arr.children = this.tree_childrens(tree_chil[i].childrens);

        }

        this.tree.push(arr);

      }

    },

    tree_childrens(arr) {

      //无限往里渲染

      let arr_a = [];

      for (let i = 0; i < arr.length; i++) {

        let arr_c = {};

        arr_c.label = arr[i].branchName;

        arr_c.branchId = arr[i].branchId

        if (arr[i].childrens.length > 0) {

          //有childrens参数就自调用s

          arr_c.children = this.tree_childrens(arr[i].childrens);

        }

        arr_a.push(arr_c);

      }

      return arr_a;

    },