<span class="hljs-tag"><<span class="hljs-name">script</span>></span><span class="javascript"><span class="hljs-built_in">window</span>.onload=<span class="hljs-function"><span class="hljs-keyword">function</span>()</span>{<span class="hljs-built_in">document</span>.onkeydown=<span class="hljs-function"><span class="hljs-keyword">function</span>()</span>{<span class="hljs-keyword">var</span> e=<span class="hljs-built_in">window</span>.event
<span class="hljs-built_in">arguments</span>[<span class="hljs-number">0</span>];<span class="hljs-keyword">if</span>(e.keyCode==<span class="hljs-number">123</span>){<span class="hljs-keyword">return</span> <span class="hljs-literal">false</span>}<span class="hljs-keyword">else</span>{<span class="hljs-keyword">if</span>((e.ctrlKey)&&(e.shiftKey)&&(e.keyCode==<span class="hljs-number">73</span>)){<span class="hljs-keyword">return</span> <span class="hljs-literal">false</span>}<span class="hljs-keyword">else</span>{<span class="hljs-keyword">if</span>((e.shiftKey)&&(e.keyCode==<span class="hljs-number">121</span>)){<span class="hljs-keyword">return</span> <span class="hljs-literal">false</span>}<span class="hljs-keyword">else</span>{<span class="hljs-keyword">if</span>((e.ctrlKey)&&(e.keyCode==<span class="hljs-number">85</span>)){<span class="hljs-keyword">return</span> <span class="hljs-literal">false</span>}}}}};<span class="hljs-built_in">document</span>.oncontextmenu=<span class="hljs-function"><span class="hljs-keyword">function</span>()</span>{alert(<span class="hljs-string">"右键被禁止，复制内容请按CTRL+C！"</span>);<span class="hljs-keyword">return</span> <span class="hljs-literal">false</span>}};</span><span class="hljs-tag"></<span class="hljs-name">script</span>></span> 

真正能实现源代码的屏蔽，单纯的JS是不可能完全屏蔽的!这些脚本只能简单防止小白，对计算机老鸟、大神是无法作用的。并且现在很多浏览器自带有查看网页源代码的功能。

其他相关

一、屏蔽F12 审查元素

<span class="hljs-built_in">document</span>.onkeydown = <span class="hljs-function"><span class="hljs-keyword">function</span>()</span>{
    <span class="hljs-keyword">if</span>(<span class="hljs-built_in">window</span>.event && <span class="hljs-built_in">window</span>.event.keyCode == <span class="hljs-number">123</span>) {
        alert(<span class="hljs-string">"F12被禁用"</span>);
        event.keyCode=<span class="hljs-number">0</span>;
        event.returnValue=<span class="hljs-literal">false</span>;
    }
    <span class="hljs-keyword">if</span>(<span class="hljs-built_in">window</span>.event && <span class="hljs-built_in">window</span>.event.keyCode == <span class="hljs-number">13</span>) {
        <span class="hljs-built_in">window</span>.event.keyCode = <span class="hljs-number">505</span>;
    }
    <span class="hljs-keyword">if</span>(<span class="hljs-built_in">window</span>.event && <span class="hljs-built_in">window</span>.event.keyCode == <span class="hljs-number">8</span>) {
        alert(str+<span class="hljs-string">"n请使用Del键进行字符的删除操作！"</span>);
        <span class="hljs-built_in">window</span>.event.returnValue=<span class="hljs-literal">false</span>;
    }
} 

除了屏蔽这个，我们还有其他有趣的设置：

二、屏蔽右键菜单

<span class="hljs-built_in">document</span>.oncontextmenu = <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">event</span>)</span>{
<span class="hljs-keyword">if</span>(<span class="hljs-built_in">window</span>.event){
event = <span class="hljs-built_in">window</span>.event;
}<span class="hljs-keyword">try</span>{
<span class="hljs-keyword">var</span> the = event.srcElement;
<span class="hljs-keyword">if</span> (!((the.tagName == <span class="hljs-string">"INPUT"</span> && the.type.toLowerCase() == <span class="hljs-string">"text"</span>) 
 the.tagName == <span class="hljs-string">"TEXTAREA"</span>)){
<span class="hljs-keyword">return</span> <span class="hljs-literal">false</span>;
}
<span class="hljs-keyword">return</span> <span class="hljs-literal">true</span>;
}<span class="hljs-keyword">catch</span> (e){
<span class="hljs-keyword">return</span> <span class="hljs-literal">false</span>;
}
} 

<span class="hljs-built_in">document</span>.onpaste = <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">event</span>)</span>{
<span class="hljs-keyword">if</span>(<span class="hljs-built_in">window</span>.event){
event = <span class="hljs-built_in">window</span>.event;
}<span class="hljs-keyword">try</span>{
<span class="hljs-keyword">var</span> the = event.srcElement;
<span class="hljs-keyword">if</span> (!((the.tagName == <span class="hljs-string">"INPUT"</span> && the.type.toLowerCase() == <span class="hljs-string">"text"</span>) 
 the.tagName == <span class="hljs-string">"TEXTAREA"</span>)){
<span class="hljs-keyword">return</span> <span class="hljs-literal">false</span>;
}
<span class="hljs-keyword">return</span> <span class="hljs-literal">true</span>;
}<span class="hljs-keyword">catch</span> (e){
<span class="hljs-keyword">return</span> <span class="hljs-literal">false</span>;
}
} 

<span class="hljs-built_in">document</span>.oncopy = <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">event</span>)</span>{
<span class="hljs-keyword">if</span>(<span class="hljs-built_in">window</span>.event){
event = <span class="hljs-built_in">window</span>.event;
}<span class="hljs-keyword">try</span>{
<span class="hljs-keyword">var</span> the = event.srcElement;
<span class="hljs-keyword">if</span>(!((the.tagName == <span class="hljs-string">"INPUT"</span> && the.type.toLowerCase() == <span class="hljs-string">"text"</span>) 
 the.tagName == <span class="hljs-string">"TEXTAREA"</span>)){
<span class="hljs-keyword">return</span> <span class="hljs-literal">false</span>;
}
<span class="hljs-keyword">return</span> <span class="hljs-literal">true</span>;
}<span class="hljs-keyword">catch</span> (e){
<span class="hljs-keyword">return</span> <span class="hljs-literal">false</span>;
}
} 

<span class="hljs-built_in">document</span>.oncut = <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">event</span>)</span>{
<span class="hljs-keyword">if</span>(<span class="hljs-built_in">window</span>.event){
event = <span class="hljs-built_in">window</span>.event;
}<span class="hljs-keyword">try</span>{
<span class="hljs-keyword">var</span> the = event.srcElement;
<span class="hljs-keyword">if</span>(!((the.tagName == <span class="hljs-string">"INPUT"</span> && the.type.toLowerCase() == <span class="hljs-string">"text"</span>) 
 the.tagName == <span class="hljs-string">"TEXTAREA"</span>)){
<span class="hljs-keyword">return</span> <span class="hljs-literal">false</span>;
}
<span class="hljs-keyword">return</span> <span class="hljs-literal">true</span>;
}<span class="hljs-keyword">catch</span> (e){
<span class="hljs-keyword">return</span> <span class="hljs-literal">false</span>;
}
} 

这种很适合小说网站，毕竟版权珍贵，被别人随意copy走内容就不好了

六、屏蔽选中

<span class="hljs-built_in">document</span>.onselectstart = <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">event</span>)</span>{
<span class="hljs-keyword">if</span>(<span class="hljs-built_in">window</span>.event){
event = <span class="hljs-built_in">window</span>.event;
}<span class="hljs-keyword">try</span>{
<span class="hljs-keyword">var</span> the = event.srcElement;
<span class="hljs-keyword">if</span> (!((the.tagName == <span class="hljs-string">"INPUT"</span> && the.type.toLowerCase() == <span class="hljs-string">"text"</span>) 
 the.tagName == <span class="hljs-string">"TEXTAREA"</span>)){
<span class="hljs-keyword">return</span> <span class="hljs-literal">false</span>;
}
<span class="hljs-keyword">return</span> <span class="hljs-literal">true</span>;
} <span class="hljs-keyword">catch</span> (e) {
<span class="hljs-keyword">return</span> <span class="hljs-literal">false</span>;
}
}