如何将二维数组中的每个元素与其相邻元素相乘，然后对整个数组求和。

function multiplyAndSumAdjacentElements(array) {
  var sum = 0;
  var rows = array.length;
  var cols = array[0].length;
  
  for (var i = 0; i < rows; i++) {
    for (var j = 0; j < cols; j++) {
      var currentElement = array[i][j];
      var product = currentElement;
      
      if (j > 0) {
        var leftNeighbor = array[i][j-1];
        product *= leftNeighbor;
      }
      
      if (j < cols - 1) {
        var rightNeighbor = array[i][j+1];
        product *= rightNeighbor;
      }
      
      if (i > 0) {
        var topNeighbor = array[i-1][j];
        product *= topNeighbor;
      }
      
      if (i < rows - 1) {
        var bottomNeighbor = array[i+1][j];
        product *= bottomNeighbor;
      }
      
      sum += product;
    }
  }
  
  return sum;
}

// 示例用法
var array = [
  [1, 2, 3],
  [4, 5, 6],
  [7, 8, 9]
];
var result = multiplyAndSumAdjacentElements(array);
console.log(result);  // 输出：315