动画演示，JS代码是怎样被混淆加密的

本文分享的是一个动画效果源码，演示JS代码是如何被加密的。

先看效果：

动画演示，JS代码是怎样被混淆加密的一般我们在进行JS加密时，提交原始代码，紧接着就直接得到了加密代码，混淆加密过程是黑盒状态，是不被我们知道的。

这个动画，用慢放的效果，逐帧演示了JS代码在进行混淆加密时发生的变化。

<h2>动画演示：JShaman是怎样对JS代码混淆加密的</h2>
<button onclick="mini_change();">开始</button><br>
<br>
<textarea id="js_code" style="width:800px; height:200px;font-size:19px;">
function get_copyright(){
    var domain = "JShaman专注于JS代码混淆加密";
    var from_year = 2017;
    var the_copyright = "(c)" + from_year + "-" + (new Date).getFullYear() + "," + domain;
    return the_copyright;
}
//输出信息
console.log(get_copyright());
</textarea>
<br>
注：演示的是JShaman专业版部分效果
<script>

    var index = 0;
    var js_code_textarea = document.getElementById("js_code");
    var change_matrix = [
        ["\n",""],
        ["    ",""],
        ["var domain","var _"],
        ["\n",""],
        ["    ",""],
        ["var from_year","var _2"],
        ["\n",""],
        ["    ",""],
        ["var the_copyright","var _3"],
        ["from_year","_2"],
        ["\n",""],
        ["    ",""],
        ["\n",""],
        ["the_copyright","_3"],
        ["domain","_"],
        ["\n",""],
        ["//输出信息",""],
        ["\n",""],
        ["function get_copyright(){",""],
        ["}",""],
        ["get_copyright()","function(){"+`var _ = "JShaman专注于JS代码混淆加密";var _2 = 2017;var _3 = "(c)" + _2 + "-" + (new Date).getFullYear() + "," + _;return _3;`+"}()"],
        [`var _ = "JShaman专注于JS代码混淆加密";var _2 = 2017;var _3 = "(c)" + _2 + "-" + (new Date).getFullYear() + "," + _;return _3;`,""],
    ]
    
    function mini_change(){
        js_code_textarea.value = js_code_textarea.value.replace(change_matrix[index][0], change_matrix[index][1]);
        index++;
        console.log(index[0]);

        if(index >change_matrix.length-1){
            console.log("执行");
            eval(js_code_textarea.value);
            alert("演示完成");
            return;
        }else{
            setTimeout(mini_change,1000);
        }
    }
</script>