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：

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。

比如：变量名变短、回车换行消失、空格删除、消除注释、函数调用变成自执行函数。

注：动画演示的是JShaman专业版使用部分功能对JS代码进行混淆加密的效果。

下面给出这个动画完整源码，保存为html文件即可使用：

动画演示：JShaman是怎样对JS代码混淆加密的

<br>function get_copyright(){<br> var domain = "JShaman专注于JS代码混淆加密";<br> var from_year = 2017;<br> var the_copyright = "(c)" + from_year + "-" + (new Date).getFullYear() + "," + domain;<br> return the_copyright;<br>}<br>//输出信息<br>console.log(get_copyright());<br>


//代码效果参考：http://www.zidongmutanji.com/zsjx/473887.html

注：演示的是JShaman专业版部分效果

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);
    }
}

这段代码中，应用了一些不错的JS技巧，参考修改，也可以用来做其它文本演示动画。