JS调试问题

suiping · 发表于 2017-6-25 10:51:28

这段JS 首尾怎么个意思，谁会解释一下，我调试不了呢

function s(t, e) {
var i = (65535 & t) + (65535 & e),
      n = (t >> 16) + (e >> 16) + (i >> 16);
return n << 16 | 65535 & i
};
function r(t, e) {
return t << e | t >>> 32 - e
}
function a(t, e, i, n, o, a) {
return s(r(s(s(e, t), s(n, a)), o), i)
}
function l(t, e, i, n, o, s, r) {
return a(e & i | ~e & n, t, e, o, s, r)
}
function c(t, e, i, n, o, s, r) {
return a(e & n | i & ~n, t, e, o, s, r)
}
function u(t, e, i, n, o, s, r) {
return a(e ^ i ^ n, t, e, o, s, r)
}
function h(t, e, i, n, o, s, r) {
return a(i ^ (e | ~n), t, e, o, s, r)
}
function d(t, e) {
t[e >> 5] |= 128 << e % 32,
t[(e + 64 >>> 9 << 4) + 14] = e;
var i, n, o, r, a, d = 1732584193,
      p = -271733879,
      f = -1732584194,
      m = 271733878;
for (i = 0; i < t.length; i += 16)
n = d,
o = p,
r = f,
a = m,
d = l(d, p, f, m, t[i], 7, -680876936),
m = l(m, d, p, f, t[i + 1], 12, -389564586),
f = l(f, m, d, p, t[i + 2], 17, 606105819),
p = l(p, f, m, d, t[i + 3], 22, -1044525330),
d = l(d, p, f, m, t[i + 4], 7, -176418897),
m = l(m, d, p, f, t[i + 5], 12, 1200080426),
f = l(f, m, d, p, t[i + 6], 17, -1473231341),
p = l(p, f, m, d, t[i + 7], 22, -45705983),
d = l(d, p, f, m, t[i + 8], 7, 1770035416),
m = l(m, d, p, f, t[i + 9], 12, -1958414417),
f = l(f, m, d, p, t[i + 10], 17, -42063),
p = l(p, f, m, d, t[i + 11], 22, -1990404162),
d = l(d, p, f, m, t[i + 12], 7, 1804603682),
m = l(m, d, p, f, t[i + 13], 12, -40341101),
f = l(f, m, d, p, t[i + 14], 17, -1502002290),
p = l(p, f, m, d, t[i + 15], 22, 1236535329),
d = c(d, p, f, m, t[i + 1], 5, -165796510),
m = c(m, d, p, f, t[i + 6], 9, -1069501632),
f = c(f, m, d, p, t[i + 11], 14, 643717713),
p = c(p, f, m, d, t[i], 20, -373897302),
d = c(d, p, f, m, t[i + 5], 5, -701558691),
m = c(m, d, p, f, t[i + 10], 9, 38016083),
f = c(f, m, d, p, t[i + 15], 14, -660478335),
p = c(p, f, m, d, t[i + 4], 20, -405537848),
d = c(d, p, f, m, t[i + 9], 5, 568446438),
m = c(m, d, p, f, t[i + 14], 9, -1019803690),
f = c(f, m, d, p, t[i + 3], 14, -187363961),
p = c(p, f, m, d, t[i + 8], 20, 1163531501),
d = c(d, p, f, m, t[i + 13], 5, -1444681467),
m = c(m, d, p, f, t[i + 2], 9, -51403784),
f = c(f, m, d, p, t[i + 7], 14, 1735328473),
p = c(p, f, m, d, t[i + 12], 20, -1926607734),
d = u(d, p, f, m, t[i + 5], 4, -378558),
m = u(m, d, p, f, t[i + 8], 11, -2022574463),
f = u(f, m, d, p, t[i + 11], 16, 1839030562),
p = u(p, f, m, d, t[i + 14], 23, -35309556),
d = u(d, p, f, m, t[i + 1], 4, -1530992060),
m = u(m, d, p, f, t[i + 4], 11, 1272893353),
f = u(f, m, d, p, t[i + 7], 16, -155497632),
p = u(p, f, m, d, t[i + 10], 23, -1094730640),
d = u(d, p, f, m, t[i + 13], 4, 681279174),
m = u(m, d, p, f, t[i], 11, -358537222),
f = u(f, m, d, p, t[i + 3], 16, -722521979),
p = u(p, f, m, d, t[i + 6], 23, 76029189),
d = u(d, p, f, m, t[i + 9], 4, -640364487),
m = u(m, d, p, f, t[i + 12], 11, -421815835),
f = u(f, m, d, p, t[i + 15], 16, 530742520),
p = u(p, f, m, d, t[i + 2], 23, -995338651),
d = h(d, p, f, m, t[i], 6, -198630844),
m = h(m, d, p, f, t[i + 7], 10, 1126891415),
f = h(f, m, d, p, t[i + 14], 15, -1416354905),
p = h(p, f, m, d, t[i + 5], 21, -57434055),
d = h(d, p, f, m, t[i + 12], 6, 1700485571),
m = h(m, d, p, f, t[i + 3], 10, -1894986606),
f = h(f, m, d, p, t[i + 10], 15, -1051523),
p = h(p, f, m, d, t[i + 1], 21, -2054922799),
d = h(d, p, f, m, t[i + 8], 6, 1873313359),
m = h(m, d, p, f, t[i + 15], 10, -30611744),
f = h(f, m, d, p, t[i + 6], 15, -1560198380),
p = h(p, f, m, d, t[i + 13], 21, 1309151649),
d = h(d, p, f, m, t[i + 4], 6, -145523070),
m = h(m, d, p, f, t[i + 11], 10, -1120210379),
f = h(f, m, d, p, t[i + 2], 15, 718787259),
p = h(p, f, m, d, t[i + 9], 21, -343485551),
d = s(d, n),
p = s(p, o),
f = s(f, r),
m = s(m, a);
return [d, p, f, m]
}
function p(t) {
var e, i = "";
for (e = 0; e < 32 * t.length; e += 8)
i += String.fromCharCode(t[e >> 5] >>> e % 32 & 255);
return i
}
function f(t) {
var e, i = [];
for (i[(t.length >> 2) - 1] = void 0,
e = 0; e < i.length; e += 1)
i[e] = 0;
for (e = 0; e < 8 * t.length; e += 8)
i[e >> 5] |= (255 & t.charCodeAt(e / 8)) << e % 32;
return i
}
function m(t) {
return p(d(f(t), 8 * t.length))
}
function g(t, e) {
var i, n, o = f(t),
      s = [],
      r = [];
for (s[15] = r[15] = void 0,
o.length > 16 && (o = d(o, 8 * t.length)),
i = 0; i < 16; i += 1)
s[i] = 909522486 ^ o[i],
r[i] = 1549556828 ^ o[i];
return n = d(s.concat(f(e)), 512 + 8 * e.length),
p(d(r.concat(n), 640))
}
function v(t) {
var e, i, n = "0123456789abcdef",
      o = "";
for (i = 0; i < t.length; i += 1)
e = t.charCodeAt(i),
o += n.charAt(e >>> 4 & 15) + n.charAt(15 & e);
return o
}
function w(t) {
return unescape(encodeURIComponent(t))
}
function y(t) {
return m(w(t))
}
function b(t) {
return v(y(t))
}
function _(t, e) {
return g(w(t), w(e))
}
function x(t, e) {
return v(_(t, e))
}
function S(t, e, i) {
return e ? i ? _(e, t) : x(e, t) : i ? y(t) : b(t)
}
n = function() {
return S
}