博客（网站）中需要对文章标题进行翻译成英文显示，要求可以批量翻译。

这里使用 nodejs 来对指定内容进行翻译，主要用到的知识点有两个：

1. 百度 API

地址为：http://fanyi.baidu.com/v2transapi

方法：POST

参数格式：

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{
    from: 'zh',
    to: 'en',
    query: '这里是内容'
}

from：表示源语言（zh表示中文）

to：表示想要翻译的语言（en表示为英文）

query：表示需要翻译的内容

2. http.request 接口

http.request(options, callback)

  • host: A domain name or IP address of the server to issue the request to. Defaults to ‘localhost’.
  • hostname: To support url.parse() hostname is preferred over host
  • port: Port of remote server. Defaults to 80.
  • localAddress: Local interface to bind for network connections.
  • socketPath: Unix Domain Socket (use one of host:port or socketPath)
  • method: A string specifying the HTTP request method. Defaults to ‘GET’.
  • path: Request path. Defaults to ‘/’. Should include query string if any. E.G. ‘/index.html?page=12’
  • headers: An object containing request headers.
  • auth: Basic authentication i.e. ‘user:password’ to compute an Authorization header.
  • agent: Controls Agent behavior.

3. 实现

github 源码

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function translate(query, callback) {

    var params = {
            from: 'zh',
            to: 'en',
            query: query
        },
        data = querystring.stringify(params);
        options = {
            host: 'fanyi.baidu.com',
            port: 80,
            path: '/v2transapi',
            method: 'POST',
            headers: {
                'Content-Type':'application/x-www-form-urlencoded',
                'Content-Length': data.length
            }
        };

    var req = http.request(options, function(res) {
        var result = '';

        res.setEncoding('utf8');
        res.on('data', function(data) {
            result += data;
        });
        res.on('end', function() {
            var obj = JSON.parse(result),
                str = obj.trans_result.data[0].dst;

            str = str.replace(/\"/g, '');
            str = str.toLowerCase().split(' ').join('_');
            console.log(str);
        });
    });

    req.on('error', function(err) {
        console.log(err);
        setTimeout(function() {
            translation(query, callback);
        }, 3000);
    });

    req.write(data);
    req.end();

}