How to hide and decrypt source code using javascript_javascript skills

<!-- 当然了，行家真正要查看源代码,还是有办法的，比如在地址栏中输入, javascript:alert(document.documentElement.outerHTML); -->
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The code is as follows:

function clear(){
Source=document. body.firstChild.data;
document.open();
document.close();
document.title="Cannot see source code";
document.body.innerHTML=Source;
}