function click(e) {
    e = e || event;  
    if(e.button == 2) {
        alert('本网站已屏蔽鼠标右键');
        return false;
    }

    if (e.ctrlKey == true && (e.keyCode == 65 || e.keyCode == 67 || e.keyCode == 86)) {
        alert('本网站已屏蔽全选,复制等快捷键');
        return false;
    }
}

var Sys = {};
var ua = navigator.userAgent.toLowerCase();
if (window.ActiveXObject)
    Sys.ie = ua.match(/msie ([\d.]+)/)[1]

if (Sys.ie || navigator.userAgent.indexOf("Firefox") > 0) {
    document.oncontextmenu = click;
    document.onmousedown = click;
    document.onkeydown = click;
}