# js编码解码
# escape 和 unescape
原理：对除ASCII字母、数字、标点符号 @ * _ + - . / 以外的其他字符进行编码
escape(string)
escape() 函数可对字符串进行编码，这样就可以在所有的计算机上读取该字符串。
escape("Kyle Thanas!测试")
"Kyle%20Thanas%21%u6D4B%u8BD5"
unescape(string)
unescape() 函数可对通过 escape() 编码的字符串进行解码。
unescape("Kyle%20Thanas%21%u6D4B%u8BD5")
"Kyle Thanas!测试"
# encodeURI 和 decodeURI
原理：返回编码为有效的统一资源标识符 (URI) 的字符串，不会被编码的字符：! @ # $ & * ( ) = : / ; ? + '
encodeURI(URIstring)
encodeURI() 函数可把字符串作为 URI 进行编码。
encodeURI("https://www.baidu.com/s?wd=编码")
"https://www.baidu.com/s?wd=%E7%BC%96%E7%A0%81"
decodeURI(URIstring)
decodeURI() 函数可对 encodeURI() 函数编码过的 URI 进行解码。
decodeURI("https://www.baidu.com/s?wd=%E7%BC%96%E7%A0%81")
"https://www.baidu.com/s?wd=编码"
# encodeURIComponent 和 decodeURIComponent
原理：对URL的组成部分进行个别编码，而不用于对整个URL进行编码
encodeURIComponent(URIstring)
encodeURIComponent() 函数可把字符串作为 URI 组件进行编码。
encodeURIComponent("https://coding.net/u/KyleThanas")
"https%3A%2F%2Fcoding.net%2Fu%2FKyleThanas"
decodeURIComponent(URIstring)
decodeURIComponent() 函数可对 encodeURIComponent() 函数编码的 URI 进行解码。
decodeURIComponent("https%3A%2F%2Fcoding.net%2Fu%2FKyleThanas")
"https://coding.net/u/KyleThanas"
# js中的BASE64算法
var Base64 = {
table: [
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
'w', 'x', 'y', 'z', '0', '1', '2', '3',
'4', '5', '6', '7', '8', '9', '+', '/'
],
UTF16ToUTF8: function (str) {
var res = [],
len = str.length;
for (var i = 0; i < len; i++) {
var code = str.charCodeAt(i);
if (code > 0x0000 && code <= 0x007F) {
res.push(str.charAt(i));
} else if (code >= 0x0080 && code <= 0x07FF) {
var byte1 = 0xC0 | ((code >> 6) & 0x1F);
var byte2 = 0x80 | (code & 0x3F);
res.push(
String.fromCharCode(byte1),
String.fromCharCode(byte2)
);
} else if (code >= 0x0800 && code <= 0xFFFF) {
var byte1 = 0xE0 | ((code >> 12) & 0x0F);
var byte2 = 0x80 | ((code >> 6) & 0x3F);
var byte3 = 0x80 | (code & 0x3F);
res.push(
String.fromCharCode(byte1),
String.fromCharCode(byte2),
String.fromCharCode(byte3)
);
} else {}
}
return res.join('');
},
UTF8ToUTF16: function (str) {
var res = [],
len = str.length;
var i = 0;
for (var i = 0; i < len; i++) {
var code = str.charCodeAt(i);
if (((code >> 7) & 0xFF) == 0x0) {
res.push(str.charAt(i));
} else if (((code >> 5) & 0xFF) == 0x6) {
var code2 = str.charCodeAt(++i);
var byte1 = (code & 0x1F) << 6;
var byte2 = code2 & 0x3F;
var utf16 = byte1 | byte2;
res.push(Sting.fromCharCode(utf16));
} else if (((code >> 4) & 0xFF) == 0xE) {
var code2 = str.charCodeAt(++i);
var code3 = str.charCodeAt(++i);
var byte1 = (code << 4) | ((code2 >> 2) & 0x0F);
var byte2 = ((code2 & 0x03) << 6) | (code3 & 0x3F);
utf16 = ((byte1 & 0x00FF) << 8) | byte2
res.push(String.fromCharCode(utf16));
} else {}
}
return res.join('');
},
encode: function (str) {
!str ? '' : 1;
var utf8 = this.UTF16ToUTF8(str),
i = 0,
res = [];
var len = utf8.length;
while (i < len) {
var c1 = utf8.charCodeAt(i++) & 0xFF;
res.push(this.table[c1 >> 2]);
if (i == len) {
res.push(this.table[(c1 & 0x3) << 4]);
res.push('==');
break;
}
var c2 = utf8.charCodeAt(i++);
if (i == len) {
res.push(this.table[((c1 & 0x3) << 4) | ((c2 >> 4) & 0x0F)]);
res.push(this.table[(c2 & 0x0F) << 2]);
res.push('=');
break;
}
var c3 = utf8.charCodeAt(i++);
res.push(this.table[((c1 & 0x3) << 4) | ((c2 >> 4) & 0x0F)]);
res.push(this.table[((c2 & 0x0F) << 2) | ((c3 & 0xC0) >> 6)]);
res.push(this.table[c3 & 0x3F]);
}
return res.join('');
},
decode: function (str) {
!str ? '' : 1;
var len = str.length,
i = 0,
res = [];
while (i < len) {
code1 = this.table.indexOf(str.charAt(i++));
code2 = this.table.indexOf(str.charAt(i++));
code3 = this.table.indexOf(str.charAt(i++));
code4 = this.table.indexOf(str.charAt(i++));
c1 = (code1 << 2) | (code2 >> 4);
c2 = ((code2 & 0xF) << 4) | (code3 >> 2);
c3 = ((code3 & 0x3) << 6) | code4;
res.push(String.fromCharCode(c1));
code3 != 64 ? res.push(String.fromCharCode(c2)) : 1;
code4 != 64 ? res.push(String.fromCharCode(c3)) : 1;
}
return this.UTF8ToUTF16(res.join(''));
}
};
var b64 = Base64.encode('KyleThanas,Base64,简书');
console.log(b64);
console.log(Base64.decode(b64));
# 其他的转换
JSON.parse(escape2Html(data));
function escape2Html(str) {
var arrEntities = {
'lt': '<',
'gt': '>',
'nbsp': ' ',
'amp': '&',
'quot': '"'
};
return str.replace(/&(lt|gt|nbsp|amp|quot);/ig, function(all, t) {
return arrEntities[t];
});
}
# 更多编码、算法
sha1 (opens new window)
https://kylethanas.coding.me/demo/js/sha1.js (opens new window)var sha = hex_sha1(navigator.userAgent)
md5 (opens new window)
http://kylethanas.coding.me/demo/js/md5.js (opens new window)var hash = hex_md5(navigator.userAgent);
我是Kylethanas🐏
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