如何分解字符串并计算和？

function calculateSumFromString(inputString, delimiter) {
  var stringArray = inputString.split(delimiter);
  var sum = 0;
  
  for (var i = 0; i < stringArray.length; i++) {
    var number = parseFloat(stringArray[i]);
    
    if (!isNaN(number)) {
      sum += number;
    }
  }
  
  return sum;
}

var inputString = "1,2,3,4,5";
var delimiter = ",";
var result = calculateSumFromString(inputString, delimiter);
console.log(result); // 输出15