Use JS to implement encryption and decryption operations
This time I will bring you the use of JS to perform encryption and decryption operations, and what are the precautions for using JS to perform encryption and decryption operations. The following is a practical case, let's take a look.
JavaScript Implements encryption and decryption of content. Encrypt and convert to encoding. Decryption is encoding to string .
<html>
<head>
<meta charset="utf-8" />
<title>JS加密解密</title>
</head>
<body>
<h1> 加密解密 </h1>
<input type="text" id="secret" />
<input type="button" value="加密" onclick="encode()">
<input type="button" value="解密" onclick="decode();">
<script>
// 加密
function encode()
{
// var s = secret.value;
// s 是一个字符串， 类型： String
// 根据 s 来创建一个字符串对象
// str 的类型是: Object
// var str = new String(s);
// length 是获取字符串对象的长度，也就是说有多少个字符
// str.length
var str = secret.value;
var r = "";
// string 类型的可以当做字符串对象来用
for (var i = 0; i < str.length; i++)
{
// 取出下标为 i 字符的编码
var code = str.charCodeAt(i);
// 将字符对应的编码，拼接到一个空字符串上
r += code;
// 每个符号后，添加 , 分割
r += ",";
}
// secret.value
// 设置输入框的内容为 r
secret.value = r;
}
// 使用到知识点(1)---如何将一个 数字 转换成对应的 字符
// String.fromCharCode
// 函数功能： 将 数字 转换成对应的 字符
// String 其实是系统的一个对象
// document.write( String.fromCharCode(97) );
/*
var s = "97,98,99,";
// 字符串对象中 split 方法
// 作用： 按照参数 分割 字符串
// 返回值： 分割之后的 数组
var arr = s.split(",");
// 数组中多了一个空白的元素，如何处理？
// 删除数组中最后一个元素
arr.pop();
document.write(arr);
//*/
// 解密
function decode()
{
// 获取文本框中的字符串
// 例如： 96,97,98
var str = secret.value;
// 思路：
// 1. 按照 , 分割字符串
// 2. 将每个 分割的子字符串 转换成 数字，再转换成 字符
// 96 97 98
// 3. 将还原的字符，拼接在一起，再设置到 input 中去
var arr = str.split(",");
// 用于拼接结果的
var r = "";
for (var i = 0; i < arr.length; i++)
{
// 获取加密后的 字符串的编码，是一个数字
var code = parseInt(arr[i]);
r += String.fromCharCode(code);
}
// 将拼接后的结果，设置到 input 中
secret.value = r;
}
</script>
</body>
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