共计 896 个字符,预计需要花费 3 分钟才能阅读完成。
网上有的代码会计算出正数,有的不反对中文,这里整合了一下代码。
验证网站: https://www.lammertbies.nl/co…
function CRC32(str, radix = 10) {const Utf8Encode = function(string) {string = string.replace(/\r\n/g, "\n");
let text = "";
for (let n = 0; n < string.length; n++) {const c = string.charCodeAt(n);
if (c < 128) {text += String.fromCharCode(c);
} else if ((c > 127) && (c < 2048)) {text += String.fromCharCode((c >> 6) | 192);
text += String.fromCharCode((c & 63) | 128);
} else {text += String.fromCharCode((c >> 12) | 224);
text += String.fromCharCode(((c >> 6) & 63) | 128);
text += String.fromCharCode((c & 63) | 128);
}
}
return text;
}
const makeCRCTable = function(){
let c;
const crcTable = [];
for(let n =0; n < 256; n++){
c = n;
for(let k =0; k < 8; k++){c = ((c&1) ? (0xEDB88320 ^ (c >>> 1)) : (c >>> 1));
}
crcTable[n] = c;
}
return crcTable;
}
const crcTable = makeCRCTable();
const strUTF8 = Utf8Encode(str);
let crc = 0 ^ (-1);
for (let i = 0; i < strUTF8.length; i++) {crc = (crc >>> 8) ^ crcTable[(crc ^ strUTF8.charCodeAt(i)) & 0xFF];
}
crc = (crc ^ (-1)) >>> 0;
return crc.toString(radix);
};
正文完
发表至: javascript
2021-05-27