一、阻止默认行为
return false;
自定义右键菜单
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<style>
*{ margin:0; padding:0;}
#ul1{ list-style:none; display:none; width:100px; padding:5px; background:#ddd; border:1px solid ddd; color:#333; line-height:24px; position:absolute;}
</style>
<script>
document.oncontextmenu = function(ev)
{
var oEvent = ev || event;
var oUl = document.getElementById('ul1');
var scrollTop = document.documentElement.scrollTop || document.body.scrollTop;
oUl.style.left = oEvent.clientX + 'px';
oUl.style.top = oEvent.clientY + scrollTop + 'px';
oUl.style.display = 'block';
return false;
};
document.onclick = function()
{
var oUl = document.getElementById('ul1');
oUl.style.display = 'none';
};
</script>
</head>
<body style="height:2000px;">
<ul id="ul1">
<li>复制</li>
<li>粘贴</li>
<li>剪切</li>
<li>撤销</li>
</ul>
</body>
</html>拖拽
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<style>
#div1{ width:100px; height:100px; background:red; position:absolute;}
</style>
<script>
window.onload = function()
{
var oDiv = document.getElementById('div1');
var disX = 0;
var disY = 0;
oDiv.onmousedown = function(ev)
{
var oEvent = ev || event;
disX = oEvent.clientX - oDiv.offsetLeft;
disY = oEvent.clientY - oDiv.offsetTop;
document.onmousemove = function(ev)
{
var oEvent = ev || event;
var iX = oEvent.clientX - disX;
var iY = oEvent.clientY - disY;
if(iX < 0)
{
iX = 0;
}
else if( iX > document.documentElement.clientWidth - oDiv.offsetWidth)
{
iX = document.documentElement.clientWidth - oDiv.offsetWidth;
}
if(iY < 0)
{
iY = 0;
}else if( iY > document.documentElement.clientHeight - oDiv.offsetHeight)
{
iY = document.documentElement.clientHeight - oDiv.offsetHeight;
}
oDiv.style.left = iX + 'px';
oDiv.style.top = iY + 'px';
};
document.onmouseup = function()
{
document.onmousemove = null;
document.onmouseup = null;
};
return false;
};
};
</script>
</head>
<body>
<div id="div1"></div>
</body>
</html>