采用jqueryUi draggable 组件开发。
引用JS ：
<script src="https://cdn.bootcss.com/jquery/1.11.1/jquery.js"></script>
<script src="https://cdn.bootcss.com/jqueryui/1.12.1/jquery-ui.js"></script>
<link href="https://cdn.bootcss.com/jqueryui/1.12.1/jquery-ui.css" rel="stylesheet">
css部分：
body {
font-family: courier new, courier;
font-size: 12px;
padding:0;
margin:0;
}
.draggable_list{
width:500px;height:500px;background:#ccc;position:relative;left:200px;top:200px;
}
.draggable {
border: 1px solid #ccc;
display: inline-block;
cursor: move;
position: absolute;
}
.guide {
display: none;
position: absolute;
left: 0;
top: 0;
}
#guide-h {
border-top: 1px dashed #55f;
width: 100%;
}
#guide-v {
border-left: 1px dashed #55f;
height: 100%;
}
html 部分：
<div class="draggable_list">
<!--需要拖动的div-->
<div class="draggable">第一个11111111111111div</div>
<div class="draggable">第二个22div</div>
<div class="draggable">第三个333333div</div>
<div class="draggable">第四个ggdgdgdiv</div>
<div class="draggable">第五个div</div>
<div class="draggable">第六个div</div>
<!--拖动辅助线-->
<div id="guide-h" class="guide"></div>
<div id="guide-v" class="guide"></div>
</div>
JS 部分：
/**
* 指标拖动辅助标线
*/
var MIN_DISTANCE = 8; //捕获的最小距离
var guides = []; // 没有可用的引导
var innerOffsetX, innerOffsetY;
$(".draggable").draggable({
start: function (event, ui) {
guides = $.map($(".draggable").not(this), computeGuidesForElement);
//offsetX、offsetY：源元素（srcElement）的X,Y坐标
innerOffsetX = event.offsetX;
innerOffsetY = event.offsetY;
},
/**
* 参数说明
* event事件的
* offsetX：
* outerwidth： 属性是一个只读的整数，声明了整个窗口的宽度。
* outerheight： 属性是一个只读的整数，声明了整个窗口的高度。
*/
drag: function (event, ui) {
//迭代所有的guids，记住最近的h和v guids
var guideV, guideH, distV = MIN_DISTANCE + 1,
distH = MIN_DISTANCE + 1,
offsetV, offsetH;
var chosenGuides = {
top: {
dist: MIN_DISTANCE + 1
},
left: {
dist: MIN_DISTANCE + 1
}
};
var $t = $(this);
//pageX、pageY：文档坐标x、y ;
var pos = {
top: (event.pageY - $(‘.draggable_list‘).offset().top) - innerOffsetY ,
left: (event.pageX - $(‘.draggable_list‘).offset().left) - innerOffsetX
};
//outerHeight、outerWidth：整个浏览器的高度、宽度
var w = $t.outerWidth() - 1;
var h = $t.outerHeight() - 1;
var elemGuides = computeGuidesForElement(null, pos, w, h);
$.each(guides, function (i, guide) {
$.each(elemGuides, function (i, elemGuide) {
if (guide.type == elemGuide.type) {
var prop = guide.type == "h" ? "top" : "left";
var d = Math.abs(elemGuide[prop] - guide[prop]);
if (d < chosenGuides[prop].dist) {
chosenGuides[prop].dist = d;
chosenGuides[prop].offset = elemGuide[prop] - pos[prop];
chosenGuides[prop].guide = guide;
}
}
});
});
if (chosenGuides.top.dist <= MIN_DISTANCE) {
$("#guide-h").css("top", chosenGuides.top.guide.top).show();
ui.position.top = chosenGuides.top.guide.top - chosenGuides.top.offset;
} else {
$("#guide-h").hide();
ui.position.top = pos.top;
}
if (chosenGuides.left.dist <= MIN_DISTANCE) {
$("#guide-v").css("left", chosenGuides.left.guide.left).show();
ui.position.left = chosenGuides.left.guide.left - chosenGuides.left.offset;
} else {
$("#guide-v").hide();
ui.position.left = pos.left;
}
},
stop: function (event, ui) {
$("#guide-v, #guide-h").hide();
}
})
function computeGuidesForElement(elem, pos, w, h) {
if (elem != null) {
var $t = $(elem);
//offset:返回当前元素 的偏移量
pos = $t.position();
pos = {
left: $t.position().left,
top: $t.position().top
}
w = $t.outerWidth() - 1;
h = $t.outerHeight() - 1;
}
return [{
type: "h",
left: pos.left,
top: pos.top
}, //垂直方向左下对齐线
{
type: "h",
left: pos.left,
top: pos.top + h
},
{
type: "v",
left: pos.left,
top: pos.top
},
{
type: "v",
left: pos.left + w,
top: pos.top
},
//您可以添加_any_其他指南在这里就好了（如指南10像素单元的左）
{
type: "h",
left: pos.left,
top: pos.top + h / 2
},
{
type: "v",
left: pos.left + w / 2,
top: pos.top
}];
}
转自 @author sdj