我们的网页常常会被人扒源码，辛辛苦苦写的内容被人复制，很是苦恼，用了下面代码可以完美有效屏解决。

禁止打开开发者工具

检测原理

通过检测视口高度，来判断是否打开了开发者工具。

检测代码

(function () {
	'use strict'
	var devtools = {
		open: false,
		orientation: null
	}
	var threshold = 160
	var emitEvent = function (state, orientation) {
		window.dispatchEvent(new CustomEvent('devtoolschange', {
			detail: {
				open: state,
				orientation: orientation
			}
		}))
	}
	setInterval(function () {
		var widthThreshold = window.outerWidth - window.innerWidth > threshold
		var heightThreshold = window.outerHeight - window.innerHeight > threshold
		var orientation = widthThreshold ? 'vertical' : 'horizontal'
		if (!(heightThreshold && widthThreshold) && ((window.Firebug && window.Firebug.chrome && window.Firebug.chrome.isInitialized) || widthThreshold || heightThreshold)) {
			if (!devtools.open || devtools.orientation !== orientation) {
				emitEvent(true, orientation)
			}
			devtools.open = true
			devtools.orientation = orientation
		} else {
			if (devtools.open) {
				emitEvent(false, null)
			}
			devtools.open = false
			devtools.orientation = null
		}
	}, 500)
	if (typeof module !== 'undefined' && module.exports) {
		module.exports = devtools
	} else {
		window.devtools = devtools
	}
})();

调用：

window.addEventListener('devtoolschange', function (e) {
	if (e.detail.open){
		document.getElementsByTagName('body')[0].innerhtml = '<style>body{height:100vh;display:flex;justify-content:center;align-items:center}h1{text-align:center;font-size:50px;color:#ccc;cursor:default}</style><h1>禁止使用开发者工具</h1>';
	}
})

调式则提示Paused in debugger

(function (a) {
    return (function (a) {
        return (Function('Function(arguments[0]+"' + a + '")()'))
    })(a)
})('bugger')('de', 0, 0, (0, 0));

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;
        }
    }
</script>

屏蔽右键菜单

document.oncontextmenu = function (event){
	window.event.returnValue = false;
}

屏蔽粘贴

document.onpaste = function (event){
	window.event.returnValue = false;
}

屏蔽复制

document.oncopy = function (event){
	window.event.returnValue = false;
}

屏蔽剪切

document.oncut = function (event){
	window.event.returnValue = false;
}

屏蔽选中

document.onselectstart = function (event){
	window.event.returnValue = false;
}

链接: https://www.fly63.com/article/detial/12281