维护Ul-Li列表的顺序

获取一个数组，该数组包含id li和该li的位置索引

.map()可与.attr() 配合使用

var arr = $('#ul_li_SubCategories li').map(function (elem) {
    return {
        value : $(this).attr('value'),
        index : $(this).index()
    }
}).get();

$(function() {
  var arr = $('#ul_li_SubCategories li').map(function(elem) {
    return {
      value: $(this).attr('value'),
      index: $(this).index()
    }
  }).get();
  
  console.log(arr)
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<ul id="ul_li_SubCategories" style="width:200px;" class="chargeCapturetable margin0">
  <li sequence="1" title="Category 1" class="liEllipsis" value="9"><a href="#"><span class="viewIcons delFaceName _delete fl"></span>Category 1</a>
  </li>
  <li sequence="2" title="Category 3" class="liEllipsis" value="11"><a href="#"><span class="viewIcons delFaceName _delete fl"></span>Category 3</a>
  </li>
  <li sequence="4" title="Category 4" class="liEllipsis" value="12"><a href="#"><span class="viewIcons delFaceName _delete fl"></span>Category 4</a>
  </li>
  <li sequence="5" title="Category 6" class="liEllipsis" value="22"><a href="#"><span class="viewIcons delFaceName _delete fl"></span>Category 6</a>
  </li>
  <li sequence="6" title="Category 5" class="liEllipsis" value="13"><a href="#"><span class="viewIcons delFaceName _delete fl"></span>Category 5</a>
  </li>
  <li sequence="7" title="Category 7" class="liEllipsis" value="55"><a href="#"><span class="viewIcons delFaceName _delete fl"></span>Category 7</a>
  </li>
  <li sequence="99999" title="Category 8" class="liEllipsis" value="62"><a href="#"><span class="viewIcons delFaceName _delete fl"></span>Category 8</a>
  </li>
</ul>

使用此：

var a = [];
$('#ul_li_SubCategories li').each(function(i){
    a.push($(this).val());
});
console.log(a);

输出：

 [9, 11, 12, 22, 13, 55, 62]

如何使用jQuery迭代div的子元素？

这应该为你指明正确的方向。只需将div替换为有问题的ul。。。

或者，在jsFiddle中为您编写代码。。。http://jsfiddle.net/

首先需要获取每个值，然后需要构建数组并对其进行串行化，最后可以通过Ajax调用保存它。这是一个JSFiddle完整的

$(document).ready(function() {
    var items = [];
    $('#ul_li_SubCategories > li').each(function () {
        items.push({
            value : $(this).attr('value'),
            index : $(this).index()
        });
    });
    $.ajax({
        url: "your url to save the items",
        type: "POST",
        data: items,
        success:function(result){
            alert(result);
        },
        error:function(xhr,status,error){
            alert(status);
        }
    });
});

参考以下答案

    
    $(function(){
$('.glyphicon-arrow-up').on('click', function(e){
   e.preventDefault();
    var _this = $(this);
    var _parent = _this.closest('ul');
    var _child = $(_parent).find('li');
    var selected= $(this).closest('li').index();
    jQuery($(_parent).children().eq(selected-1)).before(jQuery($(_parent).children().eq(selected)));
    var _child = _this.closest('ul').children();
    var _childLength = _child.length;
    var input = Array();
    $.each(_child, function(key, val){
        input[key] = $(val).data('id');
    })
     // Use below if required to update into database
    $.ajax({
        url: 'ajax.php',
        data:{
            'inputArray':input,
            'queryString':'updatePrecedence',
        },
        type: "POST",
        dataType : 'JSON',
        success: function(data){
        }
    });
});
$('.glyphicon-arrow-down').on('click', function(e){
   e.preventDefault();
    var _this = $(this);
    var _parent = _this.closest('ul');
    var _child = $(_parent).find('li');
    var selected= $(this).closest('li').index();
    jQuery($(_parent).children().eq(selected+1)).after(jQuery($(_parent).children().eq(selected)));
    selected=selected+1;
    var _child = _this.closest('ul').children();
    var _childLength = _child.length;
    var input = Array();
    $.each(_child, function(key, val){
        input[key] = $(val).data('id');
    })
   // Use below if required to update into database
    $.ajax({
        url: 'ajax.php',
        data:{
            'inputArray':input,
            'queryString':'updatePrecedence',
        },
        type: "POST",
        dataType : 'JSON',
        success: function(data){
        }
    });
});
})

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<ul>
	<li>Sample 1 <span class="glyphicon-arrow-up">Up</span><span class="glyphicon-arrow-down">Down</span></li>
	<li>Sample 2 <span class="glyphicon-arrow-up">Up</span><span class="glyphicon-arrow-down">Down</span></li>
	<li>Sample 3 <span class="glyphicon-arrow-up">Up</span><span class="glyphicon-arrow-down">Down</span></li>
	<li>Sample 4 <span class="glyphicon-arrow-up">Up</span><span class="glyphicon-arrow-down">Down</span></li>
	<li>Sample 5 <span class="glyphicon-arrow-up">Up</span><span class="glyphicon-arrow-down">Down</span></li>
	<li>Sample 6 <span class="glyphicon-arrow-up">Up</span><span class="glyphicon-arrow-down">Down</span></li>
	<li>Sample 7 <span class="glyphicon-arrow-up">Up</span><span class="glyphicon-arrow-down">Down</span></li>
</ul>

在行之后，您将获得索引值

var input = Array();
    $.each(_child, function(key, val){
        input[key] = $(val).data('id');
    })

如果打印console.log(input)，您将获得数组索引