如何在数组对象中查找元素并更新Javascript中的源数组

function findAndUpdateElement(arr, target, update) {
  arr.forEach(function(element) {
    if (element === target) {
      // 更新元素
      element = update;
    }
  });
  return arr;
}

// 示例用法
var arr = [1, 2, 3, 4, 5];
var target = 3;
var update = 6;

var result = findAndUpdateElement(arr, target, update);
console.log(result); // 输出: [1, 2, 6, 4, 5]

function findAndUpdateElement(arr, target, update) {
  return arr.map(function(element) {
    if (element === target) {
      // 更新元素
      return update;
    }
    return element;
  });
}

// 示例用法
var arr = [1, 2, 3, 4, 5];
var target = 3;
var update = 6;

var result = findAndUpdateElement(arr, target, update);
console.log(result); // 输出: [1, 2, 6, 4, 5]

function findAndUpdateElement(arr, target, update) {
  var index = arr.findIndex(function(element) {
    return element === target;
  });
  
  if (index !== -1) {
    arr[index] = update; // 更新元素
  }
  
  return arr;
}

// 示例用法
var arr = [1, 2, 3, 4, 5];
var target = 3;
var update = 6;

var result = findAndUpdateElement(arr, target, update);
console.log(result); // 输出: [1, 2, 6, 4, 5]