js 根据指定个数切割数组

Part.1 问题

写项目时，遇到需要前端做假分页的问题：后端会将数据全部返回，前端自己做分页

Part.2 思路

拿到后端全部返回的数据后，按照产品需求进行分页，如每页显示 10 条数据为例，则需要将全部数据按照每 10 条一个小数组进行分割，然后合并为一个大数组，然后根据索引取值

Part.3 例如

我们假设这是后端返回的全部数据

arr: [
               {name: '小明', age: 20},
               {name: '小红', age: 21},
               {name: '小军', age: 22},
               {name: '小王', age: 23},
               {name: '小朱', age: 24},
               {name: '小刘', age: 25},
               {name: '小张', age: 26},
               {name: '小庞', age: 27},
               {name: '小米', age: 28},
               {name: '小华', age: 29},
               {name: '小郑', age: 30},
               {name: '小蓝', age: 31},
               {name: '小绿', age: 32},
               {name: '小青', age: 33},
               {name: '小白', age: 34},
               {name: '小黑', age: 35},
               {name: '小橙', age: 36},
               {name: '小紫', age: 37},
               {name: '小山', age: 38},
               {name: '小一', age: 39},
               {name: '小鹏', age: 40},
               {name: '小丛', age: 41},
               {name: '小鱼', age: 42},
               {name: '小李', age: 43},
               {name: '小英', age: 44},
               {name: '小杰', age: 45},
               {name: '小金', age: 46},
               {name: '小窗', age: 47},
               {name: '小叶', age: 48},
               {name: '小文', age: 49},
               {name: '小龙', age: 50},
               {name: '小纯', age: 51},
               {name: '小伟', age: 52},
               {name: '小佳', age: 53},
               {name: '小吴', age: 54},
               {name: '小枚', age: 55},
               {name: '小原', age: 56},
               {name: '小书', age: 57},
               {name: '小江', age: 58},
               {name: '小砚', age: 59},
               {name: '小然', age: 60}
],

首先创建一个空数组，用于接收分割完成的小数组

 newArr: []

然后根据每页 10 条进行分割

 dataHandling: function() {
       let arrLength = this.arr.length; // 数组长度
       let num = 10;  // 每页显示 10 条
       let index = 0;
       for (let i = 0; i < arrLength; i++) {
            if (i % num === 0 && i !== 0) { // 可以被 10 整除
                 this.newArr.push(this.arr.slice(index, i));
                 index = i;
             };
             if ((i + 1) === arrLength) {
                  this.newArr.push(this.arr.slice(index, (i + 1)));
             }
       };
  }

结果如下：

将数据分割成了 5 个小数组，每个小数组为 10条数据，然后根据分页操作取大数组(newArr)的索引就可以完成取值，实现假分页操作了！~~~