Question

如何更新特定数组元素的值？

let data = [
 {title: 'food', category: 'food', value: 10},
 {title: 'good', category: 'hood', value: 40},
 {title: 'sood', category: 'lending', value: 20},
]

Answer 1

您可以简单地执行以下操作： data[1].value = "aValue"
要更新所有标题为“食品”的物品： data.filter(e => e.title === "food").forEach(e => e.value = "aValue" )
要更新所有类别为“罩”的物品： data.filter(e => i.category === "hood").forEach(e => e.value = "aValue" )

Answer 2

您的问题太短了，无法理解，但是您可以尝试通过查找对象并使用此功能替换它来更新任何对象。

  let data = [
     {title: 'food', category: 'food', value: 10},
     {title: 'good', category: 'hood', value: 40},
     {title: 'sood', category: 'lending', value: 20},
  ];

/**
* By this function you can update any array of objects and return the * updated array.
*
* @param    array    data         The data array to update.
* @param    string   findKey      The key to select the object to update.
* @param    string   findValue    The value which has to match for object selection.
* @param    string   replaceKey   Which key to update.
* @param    string   replaceValue replaceKey updated by which value.
*
* @return   array    The updated array.
*/
function update(data, findKey, findValue, replaceKey, replaceValue) {
  return data.map(value => {
    
    if (value[findKey] === findValue) {
      value[replaceKey] = replaceValue;
    }
    
    return value;
  });
}

// Here I update the data array by finding the object which has the 'title' value is 'food' and replace the 'value' field by 50
const updatedData = update(data, 'title', 'food', 'value', 50);

console.log(updatedData);

Answer 3

只需使用：

 arr.map((obj) => {

  if(obj.value === 'Old value'){
     obj.value = 'New value'; 
  }

  return obj;

 })

更新嵌套对象

3 个答案: