根据参数更新数组中的值

Question

使用JavaScript或Jquery我有以下基于开始日期（坐标）排序的数组：

[{
  elem: '<div id="task7">',
  startDate: 864,
  endDate: 999,
  order: 0
},
{
  elem: '<div id="task6">',
  startDate: 918,
  endDate: 1053,
  order: 1
},
{
  elem: '<div id="task5">',
  startDate: 945,
  endDate: 1269,
  order: 2
},
{
  elem: '<div id="task4">',
  startDate: 972,
  endDate: 1107,
  order: 3
},
{
  elem: '<div id="task8">',
  startDate: 1026,
  endDate: 1161,
  order: 4
}]

如果一个字符串的“startDate”大于任何其他字符串的“endDate”，我想将“order”值更新为参数为true的compare字符串。

以下是我尝试输出的示例，其中字符串4的“顺序”为0（与字符串0相同）：

[{
  elem: '<div id="task7">',
  startDate: 864,
  endDate: 999,
  order: 0
},
{
  elem: '<div id="task6">',
  startDate: 918,
  endDate: 1053,
  order: 1
},
{
  elem: '<div id="task5">',
  startDate: 945,
  endDate: 1269,
  order: 2
},
{
  elem: '<div id="task4">',
  startDate: 972,
  endDate: 1107,
  order: 3
},
{
  elem: '<div id="task8">',
  startDate: 1026,
  endDate: 1161,
  order: 0
}]

Answer 1

这样的事可能

var arr = [
  {elem: '<div id="task7">', startDate: 864, endDate: 999, order: 0},
  {elem: '<div id="task6">', startDate: 918, endDate: 1053, order: 1},
  {elem: '<div id="task5">', startDate: 945, endDate: 1269, order: 2},
  {elem: '<div id="task4">', startDate: 972, endDate: 1107, order: 3},
  {elem: '<div id="task8">', startDate: 1026, endDate: 1161, order: 4}
  ];


arr.forEach( function(start){
  var less = arr.filter(function(item){ return start.startDate > item.endDate})[0];
  
  if (less) start.order = less.order;
} );

console.log(arr);