JavaScript禁止页面操作的示例代码_javascript技巧

ondragstart="return false" onbeforecopy="return false" oncopy=document.selection.empty() onselect=document.selection.empty()>
-----------------------------------------------
防止复制的js
-----------------------------------------------
代码如下:

function disableselect(e){
return false}
function reEnable(){return true
}
file://if IE4+
document.onselectstart=new Function ("return false")
file://if NS6
if (window.sidebar){
document.onmousedown=disableselect
document.onclick=reEnable
}


function MM_reloadPage(init) { //reloads the window if Nav4 resized
if (init==true) with (navigator) {if ((appName=="Netscape")&&(parseInt(appVersion)==4)) {
document.MM_pgW=innerWidth; document.MM_pgH=innerHeight; onresize=MM_reloadPage; }}
else if (innerWidth!=document.MM_pgW || innerHeight!=document.MM_pgH) location.reload();
}
MM_reloadPage(true);
//-->


-------------------------------------------------------
防止下载的js
-------------------------------------------------------

--------------------------------------------------------

下面是防止右键的js:
代码如下:

if (window.Event)
document.captureEvents(Event.MOUSEUP);
function nocontextmenu() {
event.cancelBubble = true
event.returnValue = false;
return false;
}
function norightclick(e) {
if (window.Event){
if (e.which == 2 || e.which == 3)
return false;
}else{
if (event.button == 2 || event.button == 3){
event.cancelBubble = true
event.returnValue = false;
return false;
}
}
}

document.oncontextmenu = nocontextmenu; // for IE5+
document.onmousedown = norightclick; // for all others
//-->

这里是网页内容，试试您能不能复制？



应用实例：
代码如下:




//禁止用户使用邮件（隐藏右键菜单）
document.oncontextmenu = function forbidRightKey() {
window.event.returnValue = false;
}
//禁止用户使用邮件（提示用户禁用右键）
function block() {
var oEvent;
if (window.event)
oEvent = window.event;
if (oEvent.button == 2)
alert("鼠标右键不可用");
}
document.onmousedown = block;

//当用户按键AltF4的时候，提示关闭窗口信息
function altF4() {
if (window.event.altKey && window.event.keyCode == 115) {
window.close();
}
}
//alt 鼠标左键 组成快捷键 选中文本框中内容 调用方式
function getTxtSelect(eventControl) {
if (eventControl.altKey) {
document.getElementById("txt1").select();
}
}

function clearTxtByInput() {
document.getElementById("txtContent").value = "";
}

function FillTxtByInput() {
document.getElementById("txtContent").value = "输入搜索条件";
}
//禁用键盘上的某几个键 调用onkeydown="ForbidKeys();"
function ForbidKeys() {
var content = window.event.keyCode;
if (content >= 65 && content <= 68) {
window.event.returnValue = false;
} else {
window.alert(content);
}
}

//禁止复制网页内容
function forbidCopy() {
window.event.returnValue = false;
window.clipboardData.setData("Text", "");
alert("禁止复制网页内容！");
}

//设置复制内容 附加 本网站的URL
function SetCopyContent() {
window.event.returnValue = false;
var content = document.title + "/r/n";
content += document.getElementById("txt1").value + "/r/n";
content += "本资源来自 " + this.location.href;
window.clipboardData.setData('Text', content);
alert("复制成功，请粘贴到你的QQ/MSN上推荐给你的好友");
}

//禁止刷新F5 和Ctrl+F5
function ForbidFreshPage() {

if ((window.event.ctrlKey && window.event.keyCode == 116) || window.event.keyCode == 116) {
window.event.keyCode = 0;
window.event.returnValue = false;
}
}
document.onkeydown = ForbidFreshPage;
//屏蔽JS错误
function killErrors() {
return true;
}
window.onerror = killErrors;