一、屏蔽F12 审查元素
document.onkeydown = function(){
if(window.event && window.event.keyCode == 123) {
alert("F12被禁用");
event.keyCode=0;
event.returnValue=false;
}
if(window.event && window.event.keyCode == 13) {
window.event.keyCode = 505;
}
if(window.event && window.event.keyCode == 8) {
alert(str+"\n请使用Del键进行字符的删除操作！");
window.event.returnValue=false;
}
}
二、屏蔽右键菜单
document.oncontextmenu = function (event){
if(window.event){
event = window.event;
}try{
var the = event.srcElement;
if (!((the.tagName == "INPUT" && the.type.toLowerCase() == "text") || the.tagName == "TEXTAREA")){
return false;
}
return true;
}catch (e){
return false;
}
}
三、屏蔽粘贴
document.onpaste = function (event){
if(window.event){
event = window.event;
}try{
var the = event.srcElement;
if (!((the.tagName == "INPUT" && the.type.toLowerCase() == "text") || the.tagName == "TEXTAREA")){
return false;
}
return true;
}catch (e){
return false;
}
}
四、屏蔽复制
document.oncopy = function (event){
if(window.event){
event = window.event;
}try{
var the = event.srcElement;
if(!((the.tagName == "INPUT" && the.type.toLowerCase() == "text") || the.tagName == "TEXTAREA")){
return false;
}
return true;
}catch (e){
return false;
}
}
五、屏蔽剪切
document.oncut = function (event){
if(window.event){
event = window.event;
}try{
var the = event.srcElement;
if(!((the.tagName == "INPUT" && the.type.toLowerCase() == "text") || the.tagName == "TEXTAREA")){
return false;
}
return true;
}catch (e){
return false;
}
}
六、屏蔽选中
document.onselectstart = function (event){
if(window.event){
event = window.event;
}try{
var the = event.srcElement;
if (!((the.tagName == "INPUT" && the.type.toLowerCase() == "text") || the.tagName == "TEXTAREA")){
return false;
}
return true;
} catch (e) {
return false;
}
}
禁止F12加右键不弹出内容
<script type="text/javascript">
$(document).ready(function() {
$(document).bind("contextmenu", function(e) {
return false;
});
});
$(function() {
document.addEventListener('keydown', function(e) {
e = window.event || e;
var keycode = e.keyCode || e.which;
if (e.ctrlKey && keycode == 83) {
e.preventDefault();
window.event.returnValue = false;
}
if (e.ctrlKey && keycode == 85) {
e.preventDefault();
window.event.returnValue = false;
}
if (keycode == 123) {
e.preventDefault();
window.event.returnValue = false;
}
if (e.ctrlKey && e.shiftKey && keycode == 73) {
e.preventDefault();
window.event.returnValue = false;
}
});
});
</script>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<meta name="description" content="前端思考" />
<meta name="keywords" content="前端思考" />
<title>最简单的弹出层：前端思考</title>
<style>
*{margin:0;padding:0px;}
body{padding:30px;}
#show{width:300px;height:200px;display:none;padding:1px;position:relative;border:1px solid #4c77aa;background:#f2f7fd;margin-left:70px;zoom:1;}
#show h3{background:#4c77aa;color:#fff;font-size:14px;padding:5px;}
#show span{position:absolute;right:3px;top:3px;display:block;cursor:pointer;color:#fff;font-weight:bold;}
#show p{padding:5px;}
#text{font-size:12px;text-indent:2em;line-height:20px;}
</style>
<script type="text/javascript">
function show(){
var oShow = document.getElementByIdx_x('show');
oShow.style.display = 'block';
var oClose = document.createElement_x("span");
oClose.innerHTML = "×";
oShow.appendChild(oClose);
oClose.onclick = function(){
oShow.style.display = 'none';
oShow.removeChild(this);
}
}
</script>
</head>
<body>
<a onclick="show(); return false" href="#">请猛击我</a>
<div id="show">
<h3>弹出层标题栏</h3>
<p id="text">
这里是弹出层内容，内容可以是文字、图片等，可以是iframe传进来，也可以用jQuery的load()传进来。如有什么不合理的或可以改进的，大家可以给我留言，共同学习。
</p>
</div>
</body>
</html>
substr() 方法可在字符串中抽取从 start 下标开始的指定数目的字符。
stringObject.indexOf(searchvalue,fromindex)
searchvalue 必需。规定需检索的字符串值。
fromindex 可选的整数参数。规定在字符串中开始检索的位置。它的合法取值是 0 到 stringObject.length - 1。如省略该参数，则将从字符串的首字符开始检索。
$(window).scroll(function() {
var scrollTop = document.documentElement.scrollTop || window.pageYOffset || document.body.scrollTop;
if (scrollTop > 400) {
document.getElementById("bacg").style.color="rgba(31,29,30,1)";
document.getElementById("bacg").style.background="rgba(31,29,30,0.2)";
} else {
document.getElementById("bacg").style.background="rgba(31,29,30,0.1)";
}
});