如何从嵌套数组中获取字段值？

Question

我需要获取值和轴。 这就是我所拥有的。

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);

有没有一种方法可以获取输出 客户服务：0.6

Answer 1

查看复合数据结构时，方括号将代表数组和大括号对象。在这种情况下，存在一个包含对象的数组数组，并且需要通过对象的“轴”来标识它们。

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();

Answer 2

选择所需的对象，然后alert值：

 

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},

	  ]];

var obj = d[0][0];
alert(obj.axis + ": " + obj.value);

 

Answer 3

您的解决方案已经结束，您只需要添加右括号并指定正确的索引即可。尝试在浏览器中运行此代码。

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][0];
    alert(sample.axis + ": " + sample.value);
}

myFunction();

Answer 4

这是获得客户服务输出的方式：0.6。 （ES6样式）

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},
          ]
        ];
    
const myFunction = () => {
    let sample = ``;
    let axis = ``;
    let index = 0;
    d[index].forEach(item => {
        if (item.axis === `Customer Service`) {
            axis = item.axis;
            sample = item.value;
        }
    });
    alert(`${axis}: ${sample}`); // Customer Service: 0.6
}
myFunction();