1. HTML code

<div name="students" school="HK">
 <input type="boy" name="ZhangSan" value="206">
 <input type="girl" name="Lisi" value="108">
 </div>

2.jquery

<script type="text/javascript">
 /* find()  Find child element method  */
 var aaa = $("div[name='students'][school='HK']").find("input[type='boy'][name='ZhangSan']");
 console.log(aaa.val());

 /* $(".child",parent);  Method to find child elements */
 var bbb = $($("input[type='boy'][name='ZhangSan']"),$("div[name='students'][school='HK']"));
 console.log(aaa.val());

 /* each() Method traverses an array  */
 var arr = [ "one", "two", "three", "four" ];
 $.each(arr, function() {
  console.log(this);
 });

 /* each() Method processing json */
 var obj = {
  one : 1,
  two : 2,
  three : 3,
  four : 4
 };
 $.each(obj, function(key, val) {
  console.log(obj[key]);
 });

 /* each() Method processing 2 Dimensional array  */
 var arr1 = [ [ 11, 44, 33 ], [ 4, 6, 6 ], [ 7, 20, 9 ] ]
 $.each(arr1, function(i, item) {
  console.log(item[0]);
 });

 /* each() Method processing HTML Element  */
 $("div[name='students'][school='HK'] > input").each(function() {
  console.log($(this).val());
 });
 </script>