javascript - 如何从嵌套数组中获取字段值？

Question

我需要获取值和轴。这是我所拥有的。

var d = [
    [
        {axis:"Customer Service",value:0.6},
        {axis:"Data",value:0.6},
        {axis:"Network",value:0.6},
        {axis:"Product",value:0.6},
        {axis:"Specialized",value:0.6},
        {axis:"Threat",value:0.6},
    ],
    [
        {axis:"Customer Service",value:0.3},
        {axis:"Data",value:0.3},
        {axis:"Network",value:0.3},
        {axis:"Product",value:0.3},
        {axis:"Specialized",value:0.3},
        {axis:"Threat",value:0.3},
    ]

function myFunction() {
    var sample = d[0];
    alert(sample);

有什么办法可以得到输出客户服务:0.6

Answer 1

当查看复合数据结构时，方括号将表示数组和大括号对象。在本例中，有一个包含对象的数组的数组，并且需要通过它们的“轴”来标识对象。

var d = [
          [
            {axis:"Customer Service",value:0.6},
            {axis:"Data",value:0.6},
            {axis:"Network",value:0.6},
            {axis:"Product",value:0.6},
            {axis:"Specialized",value:0.6},
            {axis:"Threat",value:0.6},
          ],
          [
            {axis:"Customer Service",value:0.3},
            {axis:"Data",value:0.3},
            {axis:"Network",value:0.3},
            {axis:"Product",value:0.3},
            {axis:"Specialized",value:0.3},
            {axis:"Threat",value:0.3},
          ]
        ];
    
function myFunction() {
  let sample = '';
  let index = 0; // which of the array items is being looked at, if in a loop
  // this value could be incremented to get the Customer Service value from 
  // all of the entries in the outer array.
  d[index].forEach(function(dItem) { // loop through the array of a single object
    // looping through allows you to access any of the axis objects, not just the first
    if (dItem.axis === 'Customer Service') { // check which object
      sample = dItem.value; // if the desired object then set sample
    }
  });
  // alternatively check to see that sample is still not equal to '' before
  // alerting
  alert(sample);
}
myFunction();