Question

所以我试图用逗号打印一行中所有的朋友数组的名字，（我正在尝试学习JS和JSON，并且编程知识非常少）这是我的互联网数据文件 http://www.json-generator.com/

我的阵列 [ { ＆＃34;年龄＆＃34;：25，＆＃34; eyeColor＆＃34;：＆＃34; blue＆＃34;，＆＃34;姓名＆＃34;：＆＃34; Leon Pickett＆＃34;，＆＃34;电话＆＃34;：＆＃34; +1（834）535-2787＆＃34;，＆＃34;平衡＆＃34;：＆＃34; $ 3,632.41＆＃34;，＆＃34;地址＆＃34;：＆＃34; 856 Woodhull Street，Southmont，Wisconsin，373＆＃34;，＆＃34;朋友＆＃34;：[ {＆＃34; id＆＃34;：0，＆＃34; name＆＃34;：＆＃34; Bonnie Dudley＆＃34;}， {＆＃34; id＆＃34;：1，＆＃34; name＆＃34;：＆＃34; Blair Hopkins＆＃34;}， {＆＃34; id＆＃34;：2，＆＃34; name＆＃34;：＆＃34; Burris Lara＆＃34;} ]，}， { ＆＃34;年龄＆＃34;：29，＆＃34; eyeColor＆＃34;：＆＃34; brown＆＃34;，＆＃34;姓名＆＃34;：＆＃34; Rosales Raymond＆＃34;，＆＃34;平衡＆＃34;：＆＃34; $ 3,632.41＆＃34;，＆＃34;电话＆＃34;：＆＃34; +1（935）462-3887＆＃34;，＆＃34;地址＆＃34;：＆＃34; 745 Havens Place，Norvelt，Florida，6999＆＃34;，＆＃34;朋友＆＃34;：[ {＆＃34; id＆＃34;：0，＆＃34; name＆＃34;：＆＃34; Theresa Burt＆＃34;}， {＆＃34; id＆＃34;：1，＆＃34; name＆＃34;：＆＃34; Mooney Whitney＆＃34;}， {＆＃34; id＆＃34;：2，＆＃34; name＆＃34;：＆＃34; Hebert Gill＆＃34;} ]}]

这是我的代码

＆＃13;

var xmlhttp = new XMLHttpRequest();
var txt = "jsontst1.txt";

xmlhttp.onreadystatechange = function() {
  if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
    var myArr = JSON.parse(xmlhttp.responseText);
    myFunction(myArr);
  }
};

xmlhttp.open("GET", txt, true);
xmlhttp.send();

function myFunction(arr) {
  var out = "";
  var out2 = "";
  var i, j;
  for (i = 0; i < arr.length; i++) {
    var frndlngth = arr[i].friends.length;

    for (j = 0; j < frndlngth; j++) {
      var frnds = arr[i].friends[j];
      out2 += frnds.name;
    }

    out +=
      "Name = " + arr[i].name + "<br>" +
      "Age = " + arr[i].age + "<br>" +
      "Phone = " + arr[i].phone + "<br>" +
      "Balance = " + arr[i].balance + "<br>" +
      "Eyecolor = " + arr[i].eyeColor + "<br>" +
      "Address = " + arr[i].address + "<br>" +
      "Friends = " + out2 + "<hr>";
  }

  document.getElementById("id01").innerHTML = out;
}

＆＃13;

在输出中Friends还显示上一个数组的值？我在这做错了什么？

Answer 1

您可以使用

var stringresult = JSON.stringify（yourobject或array）;

现在你可以打印或提醒它像alert（stringresult）。

Answer 2

原因是out2变量是全局的，因此值被附加在其中，而不是在外循环后重置它。

在for-loop

中将其设为本地

＆＃13;

function myFunction(arr) {
  var out = "";
  var i, j;
  for (i = 0; i < arr.length; i++) {
    var out2 = "";
    var frndlngth = arr[i].friends.length;
    for (j = 0; j < frndlngth; j++) {
      var frnds = arr[i].friends[j];
      out2 += frnds.name;
    }
    out +=
      "Name = " + arr[i].name + "<br>" +
      "Age = " + arr[i].age + "<br>" +
      "Phone = " + arr[i].phone + "<br>" +
      "Balance = " + arr[i].balance + "<br>" +
      "Eyecolor = " + arr[i].eyeColor + "<br>" +
      "Address = " + arr[i].address + "<br>" +
      "Friends = " + out2 + "<hr>";
  }
  document.getElementById("id01").innerHTML = out;
}
var input = [{
  "age": 25,
  "eyeColor": "blue",
  "name": "Leon Pickett",
  "phone": "+1 (834) 535-2787",
  "balance": "$3,632.41",
  "address": "856 Woodhull Street, Southmont, Wisconsin, 373",
  "friends": [{
    "id": 0,
    "name": "Bonnie Dudley"
  }, {
    "id": 1,
    "name": "Blair Hopkins"
  }, {
    "id": 2,
    "name": "Burris Lara"
  }],
}, {
  "age": 29,
  "eyeColor": "brown",
  "name": "Rosales Raymond",
  "balance": "$3,632.41",
  "phone": "+1 (935) 462-3887",
  "address": "745 Havens Place, Norvelt, Florida, 6999",
  "friends": [{
    "id": 0,
    "name": "Theresa Burt"
  }, {
    "id": 1,
    "name": "Mooney Whitney"
  }, {
    "id": 2,
    "name": "Hebert Gill"
  }]
}];
myFunction(input);

＆＃13;

<div id="id01"></div>

＆＃13;

如何在Javascript中从JSON打印数组中的数组

2 个答案:

Fiddle Demo