（下面的代码帖到记事本能直接运行查看）
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<TITLE>oncontextmenu Event Sample</TITLE>
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.menuItem {font-family:sans-serif;font-size:10pt;width:100;padding-left:20;
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.highlightItem {font-family:sans-serif;font-size:10pt;width:100;padding-left:20;
background-Color:highlight;color:white}
.clickableSpan {padding:4;width:500;background-Color:blue;color:white;border:5px gray solid}
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//<!--
//弹出菜单：
function displayMenu() {
whichDiv=event.srcElement;
menu1.style.leftPos+=10;
menu1.style.posLeft=event.clientX;
menu1.style.posTop=event.clientY;
menu1.style.display="";
menu1.setCapture();
}
//高亮显示鼠标移上是菜单的背景
function switchMenu() {
el=event.srcElement;
if (el.className=="menuItem") {
el.className="highlightItem";
} else if (el.className=="highlightItem") {
el.className="menuItem";
}
}
//点击菜单相应项时触发相应的事件
function clickMenu() {
menu1.releaseCapture();
menu1.style.display="none"; //点击后隐藏菜单
el=event.srcElement;
if (el.id=="mnuRed") {
whichDiv.style.backgroundColor="red";
} else if (el.id=="mnuGreen") {
whichDiv.style.backgroundColor="green"; //选择Green时背景变为绿色
} else if (el.id=="mnuBlue") {
whichDiv.style.backgroundColor="blue"; //选择blue时背景变为蓝色
} else if (el.id=="mnuYellow") {
whichDiv.style.backgroundColor="yellow"; //选择yellow时背景变为黄色
}
}
//-->
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<H1>oncontextmenu Event Sample</H1>
<P>This sample shows how to use the <B>oncontextmenu</B> event handler, available in Microsoft® Internet Explorer 5 and later, to display both standard and custom context menus and prevent context menus from displaying. Experiment with each of the following boxes to see how you can apply different methods either to display or to inhibit context menus. Each box provides instructions for you to follow.
</P>
<SPAN class="clickableSpan">
1. The default context menu always displays when you right-click in this box.
<b><br>Code: </b>
//no code necessary
</SPAN><br><br>
<SPAN class="clickableSpan" oncontextmenu="return event.ctrlKey">
2. The default context menu displays only if you right-click in this box while holding down the Ctrl key. This is useful for developing and debugging purposes.
<b><br>Code: </b>
oncontextmenu="return event.ctrlKey"
</SPAN><br><br>
<SPAN class="clickableSpan" oncontextmenu="return false">
3. A context menu never displays when you right-click in this box.
<b><br>Code: </b>
oncontextmenu="return false"
</SPAN><br><br>
<SPAN class="clickableSpan" oncontextmenu="displayMenu();return false">
4. A custom context menu displays when you right-click in this box.
<b><br>Code: </b>
oncontextmenu="showMenu();return false;"
</SPAN><br><br>
<SPAN class="clickableSpan" oncontextmenu="if (!event.ctrlKey){displayMenu();return false;}">
5. A custom menu displays when you right-click in this box. If you right-click while holding down the Ctrl key, the default context menu displays.
<b><br>Code: </b>
oncontextmenu="if (!event.ctrlKey){displayMenu();return false;}"
</SPAN><br>
<div id=menu1 onclick="clickMenu()" onmouseover="switchMenu()" onmouseout="switchMenu()" style="position:absolute;display:none;width:100;background-Color:menu; border: outset 3px gray">
<div class="menuItem" id=mnuRed>Red</div>
<div class="menuItem" id=mnuGreen>Green</div>
<div class="menuItem" id=mnuBlue>Blue</div>
<div class="menuItem" id=mnuYellow>Yellow</div>
</div>
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