function array_diff(a, b) {

    let array = [];
    for(let i = 0; i <a.length; i++) {
        let k = 0;
        for( let j = 0; j < b.length; j++) {
            if(a[i]!==b[j]) {
                k++;
            }
            if(k===b.length) {
                array = array.concat(a[i]);
            }
        }

        if(b.length ===0) {
            array = array.concat(a[i]);
        }
    }
    return array;
}

数据:

var new_storage = JSON.parse('[{"id_order":"0003"},{"id_order":"0004"},{"id_order":"0006"}]');

var old_storage = JSON.parse('[{"id_order":"0001"},{"id_order":"0002"},{"id_order":"0003"},{"id_order":"0004"},{"id_order":"0005"}]');

使用过滤器:

var diff = new_storage
.filter(x => {if(!(old_storage.filter(y => y.id_order==x.id_order)).length){return x}})
    .concat(old_storage
    .filter(x => {if(!(new_storage.filter(y => y.id_order==x.id_order)).length){return x}})
                       ) 

console.log(JSON.stringify(diff))

两个数组的结果不同

[{"id_order":"0006"},{"id_order":"0001"},{"id_order":"0002"},{"id_order":"0005"}]

var a1 = ['a', 'b'];
var a2 = ['a', 'b', 'c', 'd'];
var diff = [];
for (var i in a2) {
   var found = false;
   for (var j in a1) {
      if (a2[i] === a1[j]) found = true;
   }
   if (found === false) diff.push(a2[i]);
}

那么简单。也可以用于对象，检查对象的一个属性。 就像,

if (a2[i].id === a1[j].id) found = true;

const difference = function (baseArray, arrayToCampare, callback = (a, b) => a!== b) {
  if (!(arrayToCampare instanceof Array)) {
    return baseArray;
  }
  return baseArray.filter(baseEl =>
    arrayToCampare.every(compareEl => callback(baseEl, compareEl)));
}

非常简单的解决方案与JavaScript的过滤器功能:

Var a1 = ['a'， 'b']; Var a2 = ['a'， 'b'， 'c'， 'd']; (arr1, arr2) { var newArr = []; var myArr = ar1 .concat(arr2); newArr = myArr.filter(函数(项){ return arr2.indexOf(item) < 0 || arr1.indexOf(item) < 0; })； 警报(newArr); ｝ diffArray (a1, a2);

var arrayDifference = function(arr1, arr2){
  if(arr1 && arr1.length){
    if(arr2 && arr2.length > 0){
      for (var i=0, itemIndex; i<arr2.length; i++){
        itemIndex = arr1.indexOf(arr2[i]);
        if(itemIndex !== -1){
          arr1.splice(itemIndex, 1);
        }
      }
    }
    return arr1;
  }
  return [];
};

arrayDifference([1,2,3,4,5], [1,5,6]);