禁止页面内按F5键进行刷新（扩展知识：禁止复制信息内容）

禁止页面内按F5键进行刷新：

//禁止页面内按F5键进行刷新
function f_DisableF5Refresh(event) {
  var e = event || window.event;
  var keyCode = e.keyCode || e.which;
  if(keyCode == 116) {
    if(e.preventDefault) { //非IE
      e.preventDefault();
    } else { //IE
      e.keyCode = 0;
      e.returnValue = false;
    }
  }
}
if(document.addEventListener) {
  document.addEventListener('keydown', f_DisableF5Refresh, false);
} else {
  document.attachEvent('onkeydown', f_DisableF5Refresh);
}

禁止复制信息内容：

//禁止复制信息内容
var returnFalse = function () {
    return false;
};
var content = document.getElementById('newsContent');
content.ondragstart = returnFalse;//IE or FireFox
content.oncopy = returnFalse;//IE or FireFox
content.onselectstart = returnFalse; //just IE
 
document.body.oncontextmenu = returnFalse; //IE or FireFox
document.body.onkeydown = function (event) {//just IE
    var e = event || window.event;
    var keyCode = e.keyCode || e.which;
    if (keyCode == 65 || keyCode == 88 || e.ctrlKey || e.shiftKey) {//key is a = 65 or x = 88
        e.returnValue = false;
    }
};