//翻译
app.get('/google', function (req, res, next) {
var content = req.query.content;
//请求查找TKK中的数值(可以当爬虫使用)
    superagent
.get('https://translate.google.cn/?hl=en')
.end(function (err, sres) { // callback
/**设置响应头允许ajax跨域访问**/
res.setHeader("Access-Control-Allow-Origin", "*");
/*星号表示所有的异域请求都可以接受，*/
res.setHeader("Access-Control-Allow-Methods", "GET,POST");
// 常规的错误处理
if (err) {
return next(err);
}
var str = sres.text;
console.log(str);
var str1 = str.split('TKK')[1].substring(20, 79);//得到TKK附近的字符串
var a = str1.match(/3d(\S*);/)[1];
var b = str1.substring(15, 74).match(/3d(\S*);/)[1];
var c = str1.substring(29, 74).match(/return (\S*)\ /)[1];
var tkd = c   '.'   ((a - 0)   (b - 0));
//得到TK的值
var myTk = tk(content, tkd);
// console.log(a   "\n"   b   "\n"   c   "\n"   myTk);
var url_google = "";
if (/^[a-zA-Z]*$/.test(content)) {
console.log("英文"   content);
url_google = "https://translate.google.cn/translate_a/single?client=t&sl=en&tl=zh-CN&hl=en&dt=at&dt=bd&dt=ex&dt=ld&dt=md&dt=qca&dt=rw&dt=rm&dt=ss&dt=t&ie=UTF-8&oe=UTF-8&otf=1&pc=1&ssel=0&tsel=0&kc=2&tk="   myTk   "&q="   content;
}
else if (/^[\u4e00-\u9fa5]*$/.test(content)) {
console.log("中文"   content);
url_google = "https://translate.google.cn/translate_a/single?client=t&sl=zh-CN&tl=en&hl=en&dt=at&dt=bd&dt=ex&dt=ld&dt=md&dt=qca&dt=rw&dt=rm&dt=ss&dt=t&ie=UTF-8&oe=UTF-8&source=btn&ssel=0&tsel=0&kc=0&tk="   myTk   "&q="   encodeURI(content);
}
//得到翻译的内容
            superagent
.get(url_google)
.end(function (err, sres) { // callback
if (err) {
return next(err);
}
res.send(sres.text);
});
});
})
function b(a, b) {
for (var d = 0; d < b.length - 2; d  = 3) {
var c = b.charAt(d   2),
c = "a" <= c ? c.charCodeAt(0) - 87 : Number(c),
c = " " == b.charAt(d   1) ? a >>> c : a << c;
a = " " == b.charAt(d) ? a   c & 4294967295 : a ^ c
}
return a
}
function tk(a, tkd) {
var tkk = tkd   "";
for (var e = tkk.split("."), h = Number(e[0]) || 0, g = [], d = 0, f = 0; f < a.length; f  ) {
var c = a.charCodeAt(f);
128 > c ? g[d  ] = c : (2048 > c ? g[d  ] = c >> 6 | 192 : (55296 == (c & 64512) && f   1 < a.length && 56320 == (a.charCodeAt(f   1) & 64512) ? (c = 65536   ((c & 1023) << 10)   (a.charCodeAt(  f) & 1023), g[d  ] = c >> 18 | 240, g[d  ] = c >> 12 & 63 | 128) : g[d  ] = c >> 12 | 224, g[d  ] = c >> 6 & 63 | 128), g[d  ] = c & 63 | 128)
}
a = h;
for (d = 0; d < g.length; d  ) a  = g[d], a = b(a, " -a^ 6");
a = b(a, " -3^ b -f");
a ^= Number(e[1]) || 0;
0 > a && (a = (a & 2147483647)   2147483648);
a %= 1E6;
return a.toString()   "."   (a ^ h)
}