通过监听document对象遍历所有的dom元素，发现点击的不是菜单对象时隐藏，代码如下：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1.0,maximum=1.0,minimum=1.0,user-scalable=0" />
<title>BFW NEW PAGE</title>
<script type="text/javascript" src="//repo.bfw.wiki/bfwrepo/js/jquery.17.js"></script>
<style>
#dropmenu{
width: 100px;
display: none;
position: absolute;
padding: 10px 0;
top:30px;
left: 0;
margin: 0;
list-style: none;
text-align: center;
background: white;
z-index: 111;
box-shadow: 0 15px 30px #e5e5e5;
font-size: 14px;
}
#dropmenu li{
padding: 1px 10px;
height: 42px;
}
#dropmenu li:hover{
background:#e5e5e5 ;
}
#dmenu{
width: 100px;
cursor: pointer;
}
.menubar{
position: relative;
}
</style>
</head>
<body>
<div class="menubar" id="dmenu">
下拉菜单<img width="15" src='//repo.bfw.wiki/bfwrepo/icon/5eb4949404188.png' />
<ul id="dropmenu">
<li>
<a>菜单一</a>
</li>
<li>
<a>菜单二</a>
</li>
<li>
<a>菜单三</a>
</li>
<li>
<a>菜单四</a>
</li>
</ul>
</div>
<script>
$(function(){
$("#dmenu").click(function(){
$("#dropmenu").show();
});
$(document).bind("click",function(e){
var e = e || window.event; //事件对象，兼容IE
var target = e.target || e.srcElement; //源对象，兼容火狐和IE
while(target){
if (target.id && target.id == "dmenu"){ //循环判断至根节点，防止点击的是#dmenu和它的子元素
return;
}
target = target.parentNode;
}
$("#dropmenu").hide(); //点击的不是#dmenu和它的子元素，隐藏下拉菜单
})
});
</script>
</body>
</html>
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