Question

拖动项目后，我的更新位置出现问题。所以我有数组对象：

  [
    {id: 1, name: "AAA", position:1},
    {id: 2, name: "BBB", position:2}, 
    {id: 3, name: "CCC", position:3},
    {id: 4, name: "DDD", position:4}
  ]

然后我想将第3项移到顶部变为：

[
  {id: 3, name: "CCC", position:3},
  {id: 1, name: "AAA", position:1},
  {id: 2, name: "BBB", position:2}, 
  {id: 4, name: "DDD", position:4}
]

那么如何更新这样的数组：

[
  {id: 3, name: "CCC", position:1},
  {id: 1, name: "AAA", position:2},
  {id: 2, name: "BBB", position:3}, 
  {id: 4, name: "DDD", position:4}
]

由于

Answer 1

使用简单的forEach条件。并使用数组更新位置值增量

var ar = [
  {id: 3, name: "CCC", position:3},
  {id: 1, name: "AAA", position:1},
  {id: 2, name: "BBB", position:2}, 
  {id: 4, name: "DDD", position:4}
]
console.log(update_position(ar))

function update_position(arr){
arr.forEach(function(a,b){
 a.position=b+1;
})
return arr
}

Answer 2

＆＃13;

var ar = [
  {id: 3, name: "CCC", position:3},
  {id: 1, name: "AAA", position:1},
  {id: 2, name: "BBB", position:2}, 
  {id: 4, name: "DDD", position:4}
]
console.log(update_position(ar))

function update_position(arr){
arr.forEach(function(a,b){
 a.position=b+1;
})
return arr
}

＆＃13;

由于

如何在javascript中拖放后更新项目位置？

2 个答案: