一维数组变二维数组

    arrayToTwoArray(baseArray) {
      // let baseArray = [1, 2, 3, 4, 5, 6, 7, 8];
      // let baseArray = [{id:1,name:'n1'},{id:2,name:'n2'},{id:3,name:'n3'},{id:4,name:'n4'},{id:5,name:'n5'}];
      let len = baseArray.length;
      let n = 3; //假设每行显示4个
      let lineNum = len % 3 === 0 ? len / 3 : Math.floor((len / 3) + 1);
      let res = [];
      for (let i = 0; i < lineNum; i++) {
        // slice() 方法返回一个从开始到结束（不包括结束）选择的数组的一部分浅拷贝到一个新数组对象。且原始数组不会被修改。
        let temp = baseArray.slice(i * n, i * n + n);
        res.push(temp);
      }
      // console.log(res);
      return res;
    },