网页防复制，禁止文字选中，禁止右键菜单js代码，兼容大部分浏览器方法

body {
-moz-user-select : none;
-webkit-user-select: none;
}

function iEsc() {
return false;
}

function iRec() {
return true;
}

function DisableKeys() {
if(event.ctrlKey || event.shiftKey || event.altKey) {
window.event.returnValue = false;
iEsc();
}
}
document.ondragstart = iEsc;
document.onkeydown = DisableKeys;
document.oncontextmenu = iEsc;
if(typeof document.onselectstart != "undefined")
document.onselectstart = iEsc;
else { //qsyz.net
document.onmousedown = iEsc;
document.onmouseup = iRec;
}

function DisableRightClick(www_qsyz_net) {
if(window.Event) {
4000
if(www_qsyz_net.which == 2 || www_qsyz_net.which == 3)
iEsc();
} else
if(event.button == 2 || event.button == 3) {
event.cancelBubble = true
event.returnValue = false;
iEsc();
}
}