<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
#rightMenu {
list-style: none;
background: gainsboro;
border: solid 1px darkgrey;
margin: 0px;
padding: 5px;
position: absolute;
/*left: 0px;*/
top: 0px;
display: none;
}
#rightMenu li {
border-bottom: solid 1px darkgrey;
}
</style>
</head>
<body>
<ul id="rightMenu" style="width: 100px;">
<li>新建</li>
<li>打开</li>
<li>保存</li>
<li>关闭</li>
</ul>
<script type="text/javascript">
//提取到函数外面作为全局变量
var rm = document.getElementById("rightMenu");
//自定义一个浏览器右键菜单，单击右键是显示它
//oncontextmenu上下文菜单事件，右键菜单
document.documentElement.oncontextmenu = function (e) {
//显示我们自己定义的右键菜单
//1.找到菜单
//提取到函数外面作为全局变量
//兼容Event对象
e = e || window.event;
//2.设置菜单的位置等于鼠标的坐标
//判断：如果鼠标的位置+菜单的宽度>网页的宽度，那么就改为右边定位
//鼠标坐标
var mx = e.clientX;
var my = e.clientY;
//菜单宽度
var rmWidth = parseInt(rm.style.width);
//网页的宽度(高度用同样的方法解决)
var pageWidth = document.documentElement.clientWidth;
//console.log(pageWidth);
if ((mx + rmWidth) < pageWidth) {
rm.style.left = mx + "px";
rm.style.top = my + "px";
}
else {
rm.style.right = mx + "px";
rm.style.top = my + "px";
}
//3.显示右键菜单
rm.style.display = "block";
//阻止默认的右键菜单显示
return false;
};
//不需要积隐藏右键菜单
document.documentElement.onclick = function () {
rm.style.display = "none";
}
</script>
</body>
</html>
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