Understand hexadecimal conversion and its function in JS
js的进制转换， 分为2进制，8进制，10进制，16进制之间的相互转换， 我们直接利用 对象.toString()即可实现：
运行下面代码
//10进制转为16进制 (10).toString(16) // =>"a" //8进制转为16进制 (012).toString(16) // =>"a" //16进制转为10进制 (0x16).toString(10) // =>"22" //16进制转为8进制 (0x16).toString(8) // =>"26" //10进制转为2进制 //=> (1111).toString(2) // => "10001010111" //8进制转为2进制 //=> (01111).toString(2) //=>"1001001001" //16进制转为2进制 //=> (0x16).toString(2) // => "10110"
如果要处理2进制到10进制，16进制到10进制，8进制到10进制， 需要用了paresInt这个方法：
运行下面代码
//2进制到10进制； parseInt(10,2) //=>2 //2进制到10进制； parseInt(100,2) //=>4 //16进制到10进制 parseInt(12, 16) //=>18 //8进制到10进制 parseInt(12,8); //=>10
进制转换
如果要实现进制之间的转换， 可以利用parseInt方法， 先转化为10进制， 然后再利用toString(参数)， 转化成不同的进制；
利用toString和parseInt方法可以实现一个进制转化的工具：
运行下面代码
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<body>
<script language="javascript">
function test()
{
var num=document.getElementById("in").value;
var type=document.getElementById("title");
var tynum,to;
for(var i=0;i<type.length;i++)
{
if(type[i].selected)
tynum=parseInt(type[i].value);
}
switch(tynum)
{
case(1):to=parseInt(num).toString(2);break;
case(2):to=parseInt(num).toString(8);break;
case(3):to=parseInt(num).toString(16);break;
case(4):to=parseInt(num,2);break;
case(5):to=parseInt(num,8);break;
case(6):to=parseInt(num,16);break;
case(7):to=parseInt(num,2).toString(8);break;
case(8):to=parseInt(num,8).toString(2);break;
case(9):to=parseInt(num,2).toString(16);break;
case(10):to=parseInt(num,16).toString(2);break;
case(11):to=parseInt(num,8).toString(16);break;
case(12):to=parseInt(num,16).toString(8);break;
}
if(isNaN(to))
to="输入非法字符了哦"
document.getElementById("out").value=to;
}
</script>
<select name="title" id="title" style="width:152px;">
<option value="1">十进制转二进制</option>
<option value="2">十进制转八进制</option>
<option value="3">十进制转十六进制</option>
<option value="4">二进制转十进制</option>
<option value="5">八进制转十进制</option>
<option value="6">十六进制转十进制</option>
<option value="7">二进制转八进制</option>
<option value="8">八进制转二进制</option>
<option value="9">二进制转十六进制</option>
<option value="10">十六进制转二进制</option>
<option value="11">八进制转十六进制</option>
<option value="12">十六进制转八进制</option>
</select><br />
<input type="text" id="in" /><br>
<input type="text" id="out" /><br/>
<input type="button" value="change" onclick="test()" />
<font color="#FF0000" style="font-size:12px;">*注：存在非法字符时，我们只截断有效字符进行转换</font>
</body>
</html> 简单加密解密
把字符串转化成unicode， 然后再把unicode转成不同的进制 ， 实现代码加密处理：
运行下面代码
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<title></title>
</head>
<body>
<script>
function en(code, h){
//简单的jS加密解密<br>//code为对应的字符串，h为（2，8，10，16）就是要转成的几进制<br>function en(code, h) {
var monyer = new Array();var i;
for(i=0;i<code.length;i++)
monyer+=code.charCodeAt(i).toString(h)+"_";//就是把字符串转成ascll码，然后再转成你想的几进制
return monyer;
};
function de(code, h) {
var i,s="",code = code.split("_");
for(i=0;i<code.length;i++) {
s += String.fromCharCode(parseInt(code[i],h));
};
return s
};
en("1哇哈哈",8) //=> "61_52307_52310_52310_"
de("61_52307_52310_52310_",8) //=> "1哇哈哈
</script>
</body>
</html> 零宽字符
利用零宽字符的零宽度， 我们把所有的字符串转化成二进制， 然后利用零宽字符进行表示， 那么生成的字符串长度就会为0， 主要反编译即可还原，
运行下面代码
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<title></title>
</head>
<body>
<script>
function en(str) {
var rep = {
'00': '\u200b',
'01': '\u200c',
'10': '\u200d',
'11': '\uFEFF'
};
str = str.replace(/[^\x00-\xff]/g, function (a) { // 转码 Latin-1 编码以外的字符。
return escape(a).replace('%', '\\');
});
str = str.replace(/[\s\S]/g, function (a) { // 处理二进制数据并且进行数据替换
a = a.charCodeAt().toString(2);
a = a.length < 8 ? Array(9 - a.length).join('0') + a : a;
return a.replace(/../g, function (a) {
return rep[a];
});
});
return str;
}
;
function de(str) {
return unescape(str.replace(/.{4}/g, function (a) {
var rep = {"\u200b": "00", "\u200c": "01", "\u200d": "10", "\uFEFF": "11"};
return String.fromCharCode(parseInt(a.replace(/./g, function (a) {
return rep[a]
}), 2)).replace(/\\/g,"%")
}))
}
var str = en("1哇哈哈");
console.log(str.length);
console.log(de(str));
</script>
</body>
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