js递归调用注意return返回值

headWidthField(data, arr = []) {
      if (this.isChildren(data) > 0) {
        let two = [];
        data.forEach(x => {
          if (x.children && x.children.length > 0) {
            two.push(...this.forHead(x.children));
          } else {
            arr.push(x);
          }
        });
        return this.headWidthField(two, arr);
      } else {
        return [...arr, ...data];
      }
    },

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