数组分组

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/**<br> * arry:数组， length:多少长度为一组<br>*/ group_arry(arry, length) {     let index = 0;     let new_arry = [];     if (arry.length > length) {         while (index < arry.length) {             new_arry.push(arry.slice(index, index += length));     }     } else {         new_arry = [arry];     }         return new_arry; }