====== 国际化语言翻译 ======
采用原生js编写的国际化语言切换工具，使用简洁方便，不依赖任何插件和库

===== 使用说明 =====
  初始化：new translation().init("en"); //传入需要使用的语言名称
  
  调用：new translation().tr("dinghui");
  
  占位符匹配：new translation().tr("ding%1hui%2","str1","str2");

===== 资源引入 =====
  <script src="translation.js"></script>
  
===== JS部分 =====
  (function(window, document) {
  
      var translation = function() {
          // this.init();
      };
  
      translation.prototype = {
          default: "en",
          init: function(language) {
              console.log("初始化");
              window.languagename = language ? language : this.default;
  
              var that = this;
              var ajax = new XMLHttpRequest();
              ajax.open('get', 'translation/' + window.languagename + '.json');
              ajax.send();
              ajax.onreadystatechange = function() {
                  if (ajax.readyState == 4 && ajax.status == 200) {
                      var data = that.getJsonObject(ajax.responseText)
                      console.log(data)
                      window.languagename = data.name;
                      window.languagelist = data.list;
                  }
              }
          },
          getJsonObject: function(p) {
              var res = null;
  
              if (typeof(p) == "object") {
                  return p;
              } else if (typeof(p) == "string") {
                  try {
                      return JSON.parse(p);
                  } catch (e) {
                      return p;
                  }
              }
              return null;
          },
          tr() {
              for (var i = 0; i < arguments.length; i++) {
                  if (typeof(arguments[i]) !== "string") {
                      throw err = new Error('Incorrect parameter type');
                  }
              }
              return this.getMsgstr(arguments);
          },
          getMsgstr: function(argument) {
              var msgid = argument[0];
              var msgstr = msgid;
              var languagelist = window.languagelist;
              for (var i = 0; i < languagelist.length; i++) {
                  if (languagelist[i].msgid == msgid) {
                      msgstr = this.msgEscape(languagelist[i], argument);
                      break;
                  }
              }
              return msgstr;
          },
          msgEscape: function() {
              var msgid = arguments[0].msgid;
              var msgstr = arguments[0].msgstr;
              var escapelist = msgid.match(/[%]\d+/g) ? msgid.match(/[%]\d+/g) : [];
              for (var i = 0; i < escapelist.length; i++) {
                  if (arguments[1][parseInt(escapelist[i].substring(1))]) {
                      msgstr = msgstr.replace(escapelist[i], this.tr(arguments[1][parseInt(escapelist[i].substring(1))]));
                  }
              }
  
              return msgstr
          }
      }
  
      window.translation = translation;
  
      new translation().init("en");
  
  }(window, document));
 

===== json部分 =====

  zh.json(中文翻译文件)
  {
      "name": "zh",
      "list": [{
          "msgid": "my name dinghui",
          "msgstr": "我的名字丁辉"
      }, {
          "msgid": "dinghui",
          "msgstr": "丁辉"
      }, {
          "msgid": "ding%1hui%2",
          "msgstr": "丁%1辉%2"
      }]
  }
  
  en.json(英文翻译文件)
  {
      "name": "en",
      "list": [{
          "msgid": "my name dinghui",
          "msgstr": "my name dinghui"
      }, {
          "msgid": "dinghui",
          "msgstr": "dinghui"
      }, {
          "msgid": "ding%1hui%2",
          "msgstr": "ding%1hui%2"
      }]
  }