# 说明
本文仅讲解百度翻译 sign 参数生成逻辑。
# 看过来!
# js 分析
先找到 sign 生成的地方然后打上断点
这个 e 参数就是你输入的文本!不信自己看
进入 b 方法,如下
注:这个 js 其实是个 webpack,但是我们只需要扣一点逻辑就行了
把这个方法拿下来,然后命名为 sign 方法,如下
然后调用这个方法随便传个参数进去,看看会怎样
然后你就看到他报错了!
报 r 未定义,那么我们就找 r,发现就在上方有个 r 的声明,如下
注:这里是将 r 声明为 null,但是当你将 r 声明为 null 的时候你会发现是会报错的。
我们找到这段代码中用到了 r 的地方,打上断点,查看 r
多次刷新调试,确定 r 不会变动,直接写死即可
最后补齐方法,完事!
# 完整代码
var r = "320305.131321201"; | |
function n(t, e) { | |
for (var n = 0; n < e.length - 2; n += 3) { | |
var r = e.charAt(n + 2); | |
r = "a" <= r ? r.charCodeAt(0) - 87 : Number(r), | |
r = "+" === e.charAt(n + 1) ? t >>> r : t << r, | |
t = "+" === e.charAt(n) ? t + r & 4294967295 : t ^ r | |
} | |
return t | |
} | |
function e(t, e) { | |
(null == e || e > t.length) && (e = t.length); | |
for (var n = 0, r = new Array(e); n < e; n++) | |
r[n] = t[n]; | |
return r | |
} | |
function sign(t) { | |
var o, i = t.match(/[\uD800-\uDBFF][\uDC00-\uDFFF]/g); | |
if (null === i) { | |
var a = t.length; | |
a > 30 && (t = "".concat(t.substr(0, 10)).concat(t.substr(Math.floor(a / 2) - 5, 10)).concat(t.substr(-10, 10))) | |
} else { | |
for (var s = t.split(/[\uD800-\uDBFF][\uDC00-\uDFFF]/), c = 0, u = s.length, l = []; c < u; c++) | |
"" !== s[c] && l.push.apply(l, function (t) { | |
if (Array.isArray(t)) | |
return e(t) | |
}(o = s[c].split("")) || function (t) { | |
if ("undefined" != typeof Symbol && null != t[Symbol.iterator] || null != t["@@iterator"]) | |
return Array.from(t) | |
}(o) || function (t, n) { | |
if (t) { | |
if ("string" == typeof t) | |
return e(t, n); | |
var r = Object.prototype.toString.call(t).slice(8, -1); | |
return "Object" === r && t.constructor && (r = t.constructor.name), | |
void 0 | |
} | |
}(o) || function () { | |
throw new TypeError("Invalid attempt to spread non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.") | |
}()), | |
c !== u - 1 && l.push(i[c]); | |
var p = l.length; | |
p > 30 && (t = l.slice(0, 10).join("") + l.slice(Math.floor(p / 2) - 5, Math.floor(p / 2) + 5).join("") + l.slice(-10).join("")) | |
} | |
for (var d = "".concat(String.fromCharCode(103)).concat(String.fromCharCode(116)).concat(String.fromCharCode(107)), h = (r).split("."), f = Number(h[0]) || 0, m = Number(h[1]) || 0, g = [], y = 0, v = 0; v < t.length; v++) { | |
var _ = t.charCodeAt(v); | |
_ < 128 ? g[y++] = _ : (_ < 2048 ? g[y++] = _ >> 6 | 192 : (55296 == (64512 & _) && v + 1 < t.length && 56320 == (64512 & t.charCodeAt(v + 1)) ? (_ = 65536 + ((1023 & _) << 10) + (1023 & t.charCodeAt(++v)), | |
g[y++] = _ >> 18 | 240, | |
g[y++] = _ >> 12 & 63 | 128) : g[y++] = _ >> 12 | 224, | |
g[y++] = _ >> 6 & 63 | 128), | |
g[y++] = 63 & _ | 128) | |
} | |
for (var b = f, w = "".concat(String.fromCharCode(43)).concat(String.fromCharCode(45)).concat(String.fromCharCode(97)) + "".concat(String.fromCharCode(94)).concat(String.fromCharCode(43)).concat(String.fromCharCode(54)), k = "".concat(String.fromCharCode(43)).concat(String.fromCharCode(45)).concat(String.fromCharCode(51)) + "".concat(String.fromCharCode(94)).concat(String.fromCharCode(43)).concat(String.fromCharCode(98)) + "".concat(String.fromCharCode(43)).concat(String.fromCharCode(45)).concat(String.fromCharCode(102)), x = 0; x < g.length; x++) | |
b = n(b += g[x], w); | |
return b = n(b, k), | |
(b ^= m) < 0 && (b = 2147483648 + (2147483647 & b)), | |
"".concat((b %= 1e6).toString(), ".").concat(b ^ f) | |
} | |
//console.log(sign('test')) |