Примеры для jQuery.each()

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Iterates through the array displaying each number as both a word and numeral

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<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery.each demo</title>
  <style>
  div {
    color: blue;
  }
  div#five {
    color: red;
  }
  </style>
  <script src="https://code.jquery.com/jquery-1.10.2.js"></script>
</head>
<body>
 
<div id="one"></div>
<div id="two"></div>
<div id="three"></div>
<div id="four"></div>
<div id="five"></div>
 
<script>
var arr = [ "one", "two", "three", "four", "five" ];
var obj = { one: 1, two: 2, three: 3, four: 4, five: 5 };
 
jQuery.each( arr, function( i, val ) {
  $( "#" + val ).text( "Mine is " + val + "." );
 
  // Will stop running after "three"
  return ( val !== "three" );
});
 
jQuery.each( obj, function( i, val ) {
  $( "#" + i ).append( document.createTextNode( " - " + val ) );
});
</script>
 
</body>
</html>

Демонстрация:

Iterates over items in an array, accessing both the current item and its index.

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$.each( [ "a", "b", "c" ], function( i, l ){
  alert( "Index #" + i + ": " + l );
});

Iterates over the properties in an object, accessing both the current item and its key.

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$.each({ name: "John", lang: "JS" }, function( k, v ) {
  alert( "Key: " + k + ", Value: " + v );
});