Javascript从嵌套数组中删除键

Question

我正在从mysql中检索数据,并希望将localStorage中的每一行数据保存为数组.以下是我在javascript端收到的嵌套数组.

arr = [{image_id: "80", imagename: "Image1",firstx: "267", firsty: "403"}, 
      {image_id: "80", imagename: "Image1",firstx: "320", firsty: "470"}, 
      {image_id: "80", imagename: "Image2",firstx: "126", firsty: "237"}
       ]

从这里我想删除image_id,imagename,firstx和firsty并返回一个数组的结果,并且只包含每个数组的值.期望的输出是

newarr =[[80,Image1,267,403],[80,Image1,320,470],[80,Image2,126,237]]

我做了以下事情:

var newarr = [];
for (var i = 0, l = arr.length; i < l; i++) {
    var keys = Object.keys(arr[i]);
    for (var j = 0, k = keys.length; j < k; j++) {
        newarr.push(arr[i][keys[j]]);
        }
}

console.log(newarr)

这将返回作为数组的每个元素.结果数组将作为嵌套数组推送到localStorage.

Answer 1

我猜你想要一个数组而不是一个对象 - map通过Object.values:

const arr = [{image_id: "80", imagename: "Image1",firstx: "267", firsty: "403"}, 
  {image_id: "80", imagename: "Image1",firstx: "320", firsty: "470"}, 
  {image_id: "80", imagename: "Image2",firstx: "126", firsty: "237"}
];
console.log(arr.map(Object.values));