Often use javascript to operate on arrays and json arrays,But after a long time, I forgot to do it.So simply record here

Look at the code directly

<! Doctype html>
<html lang="en">
  <meta charset="utf-8">
  <title>javascript array operations</title>
  <script type="application/javascript" src="lib/jquery.min.js"></script>
<h2>javascript operation array</h2>
<input type="button" value="jsArray" "jsarrays ();">
<input type="button" value="jsonarray1" "jsonarrays ();">
<script type="application/javascript">
//Array operations
  function jsarrays () {
  //create a javascript array
    var a=new array ();
    a.push ("a");
    a.push ("b");
    a.push ("c");
    //Add three elements to the array
    alert (a);
    //Use indexof to indicate where the element is in the array
    alert ("a index of a" + a.indexof ("a"));
    //Use jquery to facilitate the array
    $(a) .each (function (index, row) {
      alert ("index is" + index);
      alert ("row is" + row);
  //json array operation
  function jsonarrays () {
  //First also create a json array
    var a=new array ();
    a.push ({a:1});
    a.push ({a:2});
    a.push ({a:3});
    //Similarly add three elements to the array
    //The result of alert is [{object, object}, {object, object}, {object, object}]
    alert ("a is" + a);
    //Use the json method to convert the json array into a string. At this time, the alert is a json string.
    alert (json.stringify (a));
    //Get the value of the first element of the json array directly,At this point know that the key of json is a
    alert (a [0] .a);
    //Iterate over the key of the first element of the json array. At this time, the result of alert can be a, and the corresponding value can be obtained.
    for (var key in a [1]) {
      alert ("key is" + key);
      alert ("value is" + a [0] [key]);
    //Through json array with jquery
    $(a) .each (function (index, row) {
      for (var key in row) {
        alert ("each key is" + key);
        alert ("each value is" + row [key]);
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