js 把一个数组分割成 n 个一组

var dataArr = ['a','b','c','d','e','f','g'];

var result = [];

var colomns = n;

// js 把一个数组分割成 n 个一组
for( var i = 0, len = dataArr.length; i < len; i += colomns ) {
  result.push( dataArr.slice( i, i + colomns ) );
  alert( result );
       
  result = [];
}