JS 工具函数 方法(其中js的crc32和php的crc32区别)

 var util = {};

 util.indexOf = function (array, item) {
     for (var i = 0; i < array.length; i++) {
         if (array[i] === item) {
             return i;
         }
     }
     return -1;
 };

 util.isFunction = function (source) {
     return '[object Function]' === Object.prototype.toString.call(source);
 };

 util.isIE = function () {
     var myNav = navigator.userAgent.toLowerCase();
     return (myNav.indexOf('msie') != -1) ? parseInt(myNav.split('msie')[1]) : false;
 };

 util.extend = function (dst, obj) {
     for (var i in obj) {
         if (obj.hasOwnProperty(i)) {
             dst[i] = obj[i];
         }
     }
 };

 util.getName = function (prefix) {
     return prefix + Math.random().toString(36).replace(/[^a-z]+/g, '').substr(0, 5);
 };

 util.createScript = function (url, charset) {
     var script = document.createElement_x('script');
     script.setAttribute('type', 'text/;
     charset && script.setAttribute('charset', charset);
     script.setAttribute('src', url);
     script.async = true;
     return script;
 };

 util.jsonp = function (url, onsuccess, onerror, charset) {
     var callbackName = util.getName('tt_player');
     window[callbackName] = function () {
         if (onsuccess && util.isFunction(onsuccess)) {
             onsuccess(arguments[0]);
         }
     };
     var script = util.createScript(url + '&callback=' + callbackName, charset);
     script.onload = script.onreadystatechange = function () {
         if (!script.readyState || /loaded|complete/.test(script.readyState)) {
             script.onload = script.onreadystatechange = null;
             // 移除该script的 DOM 对象
             if (script.parentNode) {
                 script.parentNode.removeChild(script);
             }
             // 删除函数或变量
             window[callbackName] = null;
         }
     };
     script.onerror = function () {
         if (onerror && util.isFunction(onerror)) {
             onerror();
         }
     };
     document.getElementsByTagName_r('head')[0].appendChild(script);
 };

 util.json = function (options) {
     var opt = {
         url: '',
         type: 'get',
         data: {},
         success: function () {},
         error: function () {},
     };
     util.extend(opt, options);
     if (opt.url) {
         var xhr = XMLHttpRequest
            ? new XMLHttpRequest()
            : new ActiveXObject('Microsoft.XMLHTTP');
         var data = opt.data,
             url = opt.url,
             type = opt.type.toUpperCase(),
             dataArr = [];
         for (var k in data) {
             dataArr.push(k + '=' + data[k]);
         }
         if (type === 'GET') {
             url = url + '?' + dataArr.join('&');
             xhr.open(type, url.replace(/\?$/g, ''), true);
             xhr.send();
         }
         if (type === 'POST') {
             xhr.open(type, url, true);
             xmlhttp.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
             xhr.send(dataArr.join('&'));
         }
         xhr.onload = function () {
             if (xhr.status === 200 || xhr.status === 304) {
                 var res;
                 if (opt.success && opt.success instanceof Function) {
                     res = xhr.responseText;
                     if (typeof res ==== 'string') {
                         res = JSON.parse(res);
                         opt.success.call(xhr, res);
                     }
                 }
             } else {
                 if (opt.error && opt.error instanceof Function) {
                     opt.error.call(xhr, res);
                 }
             }
         };
     }
 };

 util.crc32 = function (url) {
     var a = document.createElement_x('a');
     a.href = url;
     var T = (function () {
         var c = 0,
             table = new Array(256);
         for (var n = 0; n != 256; ++n) {
             c = n;
             c = ((c & 1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
             c = ((c & 1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
             c = ((c & 1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
             c = ((c & 1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
             c = ((c & 1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
             c = ((c & 1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
             c = ((c & 1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
             c = ((c & 1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
             table[n] = c;
         }
         return typeof Int32Array !=== 'undefined' ? new Int32Array(table) : table;
     })();
     var crc32_str = function (str) {
         var C = -1;
         for (var i = 0, L = str.length, c, d; i < L;) {
             c = str.charCodeAt(i++);
             if (c < 0x80) {
                 C = (C >>> 8) ^ T[(C ^ c) & 0xFF];
             } else if (c < 0x800) {
                 C = (C >>> 8) ^ T[(C ^ (192 | ((c >> 6) & 31))) & 0xFF];
                 C = (C >>> 8) ^ T[(C ^ (128 | (c & 63))) & 0xFF];
             } else if (c >= 0xD800 && c < 0xE000) {
                 c = (c & 1023) + 64;
                 d = str.charCodeAt(i++) & 1023;
                 C = (C >>> 8) ^ T[(C ^ (240 | ((c >> 8) & 7))) & 0xFF];
                 C = (C >>> 8) ^ T[(C ^ (128 | ((c >> 2) & 63))) & 0xFF];
                 C = (C >>> 8) ^ T[(C ^ (128 | ((d >> 6) & 15) | ((c & 3) << 4))) & 0xFF];
                 C = (C >>> 8) ^ T[(C ^ (128 | (d & 63))) & 0xFF];
             } else {
                 C = (C >>> 8) ^ T[(C ^ (224 | ((c >> 12) & 15))) & 0xFF];
                 C = (C >>> 8) ^ T[(C ^ (128 | ((c >> 6) & 63))) & 0xFF];
                 C = (C >>> 8) ^ T[(C ^ (128 | (c & 63))) & 0xFF];
             }
         }
         return C ^ -1;
     };
     var r = a.pathname + '?r=' + Math.random().toString(10).substring(2);
     if (r[0] != '/') {
         r = '/' + r;
     }
     var s = crc32_str(r) >>> 0;
     var is_web = location.protocol.indexOf('http') > -1;
     return (is_web ? [location.protocol, a.hostname] : ['http:', a.hostname]).join('//') + r + '&s=' + s;
 };

 export default util;

我的上几篇文章,还傻不拉几的把js生成crc32的算法用php翻译:

其实完全不用: (Warning由于 PHP 的整数是带符号的，所以在 32 位系统上许多 crc32 校验码将返回负整数。 尽管在 64 位上所有 crc32() 的结果将都是正整数。)

$g = "http://www.baidu.com";
printf("%u", crc32($g));

我的硬翻译:

<?php
function uright($a, $n)
{
    $c = 2147483647>>($n-1);
    return $c&($a>>$n);
}
function JS_charCodeAt($str, $index){
    //not working!

    $char = mb_substr($str, $index, 1, 'UTF-8');
    if (mb_check_encoding($char, 'UTF-8'))
    {
        $ret = mb_convert_encoding($char, 'UTF-32BE', 'UTF-8');
        return hexdec(bin2hex($ret));
    } else {
        return null;
    }
}
function modulo($a, $b) {
    return $a - floor($a/$b)*$b;
}
function ToUint32($x) {
    return modulo(intval($x), pow(2, 32));
}

function pcrc32()
{
    for ($d = 0, $f = array(256), $g = 0; 256 != $g; ++$g) {
    $d = $g;
    $d = 1 & $d ? -306674912 ^ uright($d, 1) : uright($d, 1);
    $d = 1 & $d ? -306674912 ^ uright($d, 1) : uright($d, 1);
    $d = 1 & $d ? -306674912 ^ uright($d, 1) : uright($d, 1);
    $d = 1 & $d ? -306674912 ^ uright($d, 1) : uright($d, 1);
    $d = 1 & $d ? -306674912 ^ uright($d, 1) : uright($d, 1);
    $d = 1 & $d ? -306674912 ^ uright($d, 1) : uright($d, 1);
    $d = 1 & $d ? -306674912 ^ uright($d, 1) : uright($d, 1);
    $d = 1 & $d ? -306674912 ^ uright($d, 1) : uright($d, 1);
    $f[$g] = $d;
    }
      //return "undefined" != typeof Int32Array ? new Int32Array($f) : $f;
    return $f;
}

function pcrc32_str($g,$c)
{
    for ($j = -1, $k = -1, $h = -1, $f = 0, $d =strlen($g); $f < $d;)
    {
        //开始的代码⑴ j = g.charCodeAt(f++),
        //$j = $g.charCodeAt($f++); //js代码
        $j = JS_charCodeAt($g, $f++); //php代码
        //开始的代码⑵ j < 128 ? h = h >>> 8 ^ c[255 & (h ^ j)] :
        if($j < 128)
        {
            $h = uright($h, 8) ^ $c[255 & ($h ^ $j)];

        }
        else
        {
            //开始的代码⑶ j < 2048 ? (h = h >>> 8 ^ c[255 & (h ^ (192 | j >> 6 & 31))], h = h >>> 8 ^ c[255 & (h ^ (128 | 63 & j))]) :
            if($j < 2048)
            {
                $h = uright($h, 8) ^ $c[255 & ($h ^ (192 | $j >> 6 & 31))];
                $h = uright($h, 8) ^ $c[255 & ($h ^ (128 | 63 & $j))];
            }
            else
            {
                //开始的代码⑷ j >= 55296 && j < 57344 ? (j = (1023 & j) + 64, k = 1023 & g.charCodeAt(f++), h = h >>> 8 ^ c[255 & (h ^ (240 | j >> 8 & 7))], h = h >>> 8 ^ c[255 & (h ^ (128 | j >> 2 & 63))], h = h >>> 8 ^ c[255 & (h ^ (128 | k >> 6 & 15 | (3 & j) << 4))], h = h >>> 8 ^ c[255 & (h ^ (128 | 63 & k))]) : (h = h >>> 8 ^ c[255 & (h ^ (224 | j >> 12 & 15))], h = h >>> 8 ^ c[255 & (h ^ (128 | j >> 6 & 63))], h = h >>> 8 ^ c[255 & (h ^ (128 | 63 & j))]);
                if($j >= 55296 && $j < 57344)
                {
                    $j = (1023 & $j) + 64;
                    //$k = 1023 & $g.charCodeAt($f++); //js代码
                    $k = 1023 & JS_charCodeAt($g, $f++); //php代码
                    $h = uright($h, 8) ^ $c[255 & ($h ^ (240 | $j >> 8 & 7))];
                    $h = uright($h, 8) ^ $c[255 & ($h ^ (128 | $j >> 2 & 63))];
                    $h = uright($h, 8) ^ $c[255 & ($h ^ (128 | $k >> 6 & 15 | (3 & $j) << 4))];
                    $h = uright($h, 8) ^ $c[255 & ($h ^ (128 | 63 & $k))];
                }
                else
                {
                    $h = uright($h, 8) ^ $c[255 & ($h ^ (224 | $j >> 12 & 15))];
                    $h = uright($h, 8) ^ $c[255 & ($h ^ (128 | $j >> 6 & 63))];
                    $h = uright($h, 8) ^ $c[255 & ($h ^ (128 | 63 & $j))];
                }
            }
        }

    }
    return $h ^ -1;

}

$g = "http://www.baidu.com";
$c = pcrc32();
$res = pcrc32_str($g,$c);
echo ToUint32($res); //js 的代码res >>> 0 翻译过来的 (很深奥) https://www.cnblogs.com/fps2tao/p/9983508.html

?>

//下面就是js的crc32,不过代码被格式化了,和上面的js工具包,一致
<script>
    function test01(a) {
      var c = function() {
          for (var d = 0, f = new Array(256), g = 0; 256 != g; ++g) {
            d = g, d = 1 & d ? -306674912 ^ d >>> 1 : d >>> 1, d = 1 & d ? -306674912 ^ d >>> 1 : d >>> 1, d = 1 & d ? -306674912 ^ d >>> 1 : d >>> 1, d = 1 & d ? -306674912 ^ d >>> 1 : d >>> 1, d = 1 & d ? -306674912 ^ d >>> 1 : d >>> 1, d = 1 & d ? -306674912 ^ d >>> 1 : d >>> 1, d = 1 & d ? -306674912 ^ d >>> 1 : d >>> 1, d = 1 & d ? -306674912 ^ d >>> 1 : d >>> 1, f[g] = d
          }
          return "undefined" != typeof Int32Array ? new Int32Array(f) : f
        }(),
        b = function(g) {
          for (var j, k, h = -1, f = 0, d = g.length; f < d;) {
            j = g.charCodeAt(f++),j < 128 ? h = h >>> 8 ^ c[255 & (h ^ j)] : j < 2048 ? (h = h >>> 8 ^ c[255 & (h ^ (192 | j >> 6 & 31))], h = h >>> 8 ^ c[255 & (h ^ (128 | 63 & j))]) : j >= 55296 && j < 57344 ? (j = (1023 & j) + 64, k = 1023 & g.charCodeAt(f++), h = h >>> 8 ^ c[255 & (h ^ (240 | j >> 8 & 7))], h = h >>> 8 ^ c[255 & (h ^ (128 | j >> 2 & 63))], h = h >>> 8 ^ c[255 & (h ^ (128 | k >> 6 & 15 | (3 & j) << 4))], h = h >>> 8 ^ c[255 & (h ^ (128 | 63 & k))]) : (h = h >>> 8 ^ c[255 & (h ^ (224 | j >> 12 & 15))], h = h >>> 8 ^ c[255 & (h ^ (128 | j >> 6 & 63))], h = h >>> 8 ^ c[255 & (h ^ (128 | 63 & j))])
          }
          return h ^ -1
        };
      return b(a) >>> 0
    }

    var g = "http://www.baidu.com";
    ss = test01(g);
    console.log(ss);

</script>

转:http://blog.sina.com.cn/s/blog_8c0f2f270102xn76.html

参考: http://php.net/manual/zh/function.crc32.php

crc32 : https://baike.baidu.com/item/CRC32/7460858?fr=aladdin