F12审查元素的情况下，可以随机更改代码，注入恶意JS等等，避免这种情况如下：
一、屏蔽F12 审查元素
<script>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;}}
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