问需要帮助在数组中添加/组合项

EN

var array = [[1,"GOOG",4],[1,"GOOG",6],[2,"GOOG",4],[2,"FB",4]];

var result = array.reduce(function(acc, item) {
  // check if an item with the same second (item[1]) value already exist
  var index = -1;
  acc.forEach(function(e, i) {
    if(e[0] == item[1])
      index = i;
  });
  
  // if it does exist
  if (index != -1)
    acc[index][1] += item[2]; // add the value of the current item third value (item[2]) to it's second value (acc[index][1])
  // if it does not
  else
    acc.push([item[1], item[2]]); // push a new element

  return acc; // return the accumulator (see reduce docs)
}, []);

console.log(result);