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：

 1 //禁止页面内按F5键进行刷新
 2 function f_DisableF5Refresh(event) {
 3   var e = event || window.event;
 4   var keyCode = e.keyCode || e.which;
 5   if(keyCode == 116) {
 6     if(e.preventDefault) { //非IE
 7       e.preventDefault();
 8     } else { //IE
 9       e.keyCode = 0;
10       e.returnValue = false;
11     }
12   }
13 }
14 if(document.addEventListener) {
15   document.addEventListener('keydown', f_DisableF5Refresh, false);
16 } else {
17   document.attachEvent('onkeydown', f_DisableF5Refresh);
18 }

禁止复制信息内容：

 1 //禁止复制信息内容
 2 var returnFalse = function () {
 3     return false;
 4 };
 5 var content = document.getElementById('newsContent');
 6 content.ondragstart = returnFalse;//IE or FireFox
 7 content.oncopy = returnFalse;//IE or FireFox
 8 content.onselectstart = returnFalse; //just IE
 9  
10 document.body.oncontextmenu = returnFalse; //IE or FireFox
11 document.body.onkeydown = function (event) {//just IE
12     var e = event || window.event;
13     var keyCode = e.keyCode || e.which;
14     if (keyCode == 65 || keyCode == 88 || e.ctrlKey || e.shiftKey) {//key is a = 65 or x = 88
15         e.returnValue = false;
16     }
17 };