我从上面对 JSFiddle 进行了分叉，并通过支持 shape 的同一侧来改进它。这是 JsFiddle：http://jsfiddle.net/yusrilmaulidanraji/A6CpP/120/
HTML：
<div id="parent">
<div class="object1 dropped" style="left:0px;top:300px;background:#a00;"></div>
<div class="object2 dropped"></div>
<div class="object3 dropped" style="left:400px;top:20px;"></div>
<div class="objectx"></div>
<div class="objecty"></div>
</div>
CSS：
#parent{
width:600px;
height:500px;
border:1px solid #000;
position:relative;
}
.object1{
background:#aaa;
width:100px;
height:100px;
display:block;
position:absolute;
left:140px;
top:50px;
}
.object2{
background:#aaa;
width:100px;
height:150px;
display:block;
position:absolute;
left:140px;
top:50px;
}
.object3{
background:#aaa;
width:150px;
height:100px;
display:block;
position:absolute;
left:140px;
top:50px;
}
.objectx{
display:none;
//background:#fff;
width:0px;
height:100%;
position:absolute;
top:0px;
left:10px;
border-left: 1px solid yellow;
}
.objecty{
display:none;
//background:#fff;
width:100%;
height:0px;
position:absolute;
top:10px;
left:0px;
border-bottom: 1px solid yellow;
}
JS：
$.ui.plugin.add("draggable", "smartguides", {
start: function(event, ui) {
var i = $(this).data("draggable"), o = i.options;
i.elements = [];
$(o.smartguides.constructor != String ? ( o.smartguides.items || ':data(draggable)' ) : o.smartguides).each(function() {
var $t = $(this); var $o = $t.offset();
if(this != i.element[0]) i.elements.push({
item: this,
width: $t.outerWidth(), height: $t.outerHeight(),
top: $o.top, left: $o.left
});
});
},
stop: function(event, ui) {
$(".objectx").css({"display":"none"});
$(".objecty").css({"display":"none"});
},
drag: function(event, ui) {
var inst = $(this).data("draggable"), o = inst.options;
var d = o.tolerance;
$(".objectx").css({"display":"none"});
$(".objecty").css({"display":"none"});
var x1 = ui.offset.left, x2 = x1 + inst.helperProportions.width,
y1 = ui.offset.top, y2 = y1 + inst.helperProportions.height,
xc = (x1 + x2) / 2, yc = (y1 + y2) / 2;
for (var i = inst.elements.length - 1; i >= 0; i--){
var l = inst.elements[i].left, r = l + inst.elements[i].width,
t = inst.elements[i].top, b = t + inst.elements[i].height,
hc = (l + r) / 2, vc = (t + b) / 2;
var lss = Math.abs(l - x1) <= d;
var ls = Math.abs(l - x2) <= d;
var rss = Math.abs(r - x2) <= d;
var rs = Math.abs(r - x1) <= d;
var tss = Math.abs(t - y1) <= d;
var ts = Math.abs(t - y2) <= d;
var bss = Math.abs(b - y2) <= d;
var bs = Math.abs(b - y1) <= d;
var hs = Math.abs(hc - xc) <= d;
var vs = Math.abs(vc - yc) <= d;
if(lss) {
ui.position.left = inst._convertPositionTo("relative", { top: 0, left: l }).left - inst.margins.left;
$(".objectx").css({"left":ui.position.left,"display":"block"});
}
if(rss) {
ui.position.left = inst._convertPositionTo("relative", { top: 0, left: r - inst.helperProportions.width }).left - inst.margins.left;
$(".objectx").css({"left":ui.position.left + ui.helper.width(),"display":"block"});
}
if(ls) {
ui.position.left = inst._convertPositionTo("relative", { top: 0, left: l - inst.helperProportions.width }).left - inst.margins.left;
$(".objectx").css({"left":ui.position.left + ui.helper.width(),"display":"block"});
}
if(rs) {
ui.position.left = inst._convertPositionTo("relative", { top: 0, left: r }).left - inst.margins.left;
$(".objectx").css({"left":ui.position.left,"display":"block"});
}
if(tss) {
ui.position.top = inst._convertPositionTo("relative", { top: t, left: 0 }).top - inst.margins.top;
$(".objecty").css({"top":ui.position.top,"display":"block"});
}
if(ts) {
ui.position.top = inst._convertPositionTo("relative", { top: t - inst.helperProportions.height, left: 0 }).top - inst.margins.top;
$(".objecty").css({"top":ui.position.top + ui.helper.height(),"display":"block"});
}
if(bss) {
ui.position.top = inst._convertPositionTo("relative", { top: b-inst.helperProportions.height, left: 0 }).top - inst.margins.top;
$(".objecty").css({"top":ui.position.top + ui.helper.height(),"display":"block"});
}
if(bs) {
ui.position.top = inst._convertPositionTo("relative", { top: b, left: 0 }).top - inst.margins.top;
$(".objecty").css({"top":ui.position.top,"display":"block"});
}
if(hs) {
ui.position.left = inst._convertPositionTo("relative", { top: 0, left: hc - inst.helperProportions.width/2 }).left - inst.margins.left;
$(".objectx").css({"left":ui.position.left + (ui.helper.width()/2),"display":"block"});
}
if(vs) {
ui.position.top = inst._convertPositionTo("relative", { top: vc - inst.helperProportions.height/2, left: 0 }).top - inst.margins.top;
$(".objecty").css({"top":ui.position.top + (ui.helper.height()/2),"display":"block"});
}
};
}
});
$('.dropped').draggable({
containment: 'parent',
smartguides:".dropped",
tolerance:5
});