OpenLayers学习10-控制台Console语言Lang

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OpenLayers.Console和OpenLayers.Lang就是俩对象, 不是类
OpenLayers.Console通过自执行函数扩展, 配合firebug.js模拟了firebug控制台

OpenLayers.Lang维护一个key-value字典,
需要i18n时候, 去这个字典取对应值

一:console

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//自执行函数extend扩展Console
//在此之前OpenLayers.Console
(function() {
    //检查所有scripts标签, 如果包含"firebug.js"就执行扩展
    var scripts = document.getElementsByTagName("script");
    for(var i=0, len=scripts.length; i<len; ++i) {
        if(scripts[i].src.indexOf("firebug.js") != -1) {
            if(console) {
                OpenLayers.Util.extend(OpenLayers.Console, console);
                break;
            }
        }
    }
})();

二: 语言类

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//语言类
OpenLayers.Lang = {
     
    //当前语言的code
    code: null,
 
    //默认是英文
    defaultCode: "en",
         
    //没code就先set一下, 有就直接返回
    getCode: function() {
        if(!OpenLayers.Lang.code) {
            OpenLayers.Lang.setCode();
        }
        return OpenLayers.Lang.code;
    },
     
    //设置code
    setCode: function(code) {
        var lang;
        if(!code) {
            //从navigator中取language
            code = (OpenLayers.BROWSER_NAME == "msie") ?
                navigator.userLanguage : navigator.language;
        }
        //拆解组装key
        var parts = code.split('-');
        parts[0] = parts[0].toLowerCase();
        //OpenLayers.Lang[key]  = {}
        if(typeof OpenLayers.Lang[parts[0]] == "object") {
            lang = parts[0];
        }
 
        if(parts[1]) {
            var testLang = parts[0] + '-' + parts[1].toUpperCase();
            if(typeof OpenLayers.Lang[testLang] == "object") {
                lang = testLang;
            }
        }
        //没有取到, 用默认值
        if(!lang) {
            OpenLayers.Console.warn(
                'Failed to find OpenLayers.Lang.' + parts.join("-") +
                ' dictionary, falling back to default language'
            );
            lang = OpenLayers.Lang.defaultCode;
        }
         
        OpenLayers.Lang.code = lang;
    },
 
    //翻译, 
    translate: function(key, context) {
        var dictionary = OpenLayers.Lang[OpenLayers.Lang.getCode()];
        //根据key去取value
        var message = dictionary && dictionary[key];
        if(!message) {
            //没取到value, 就返回key
            message = key;
        }
        if(context) {
            message = OpenLayers.String.format(message, context);
        }
        return message;
    }
     
};
 
//i18n
OpenLayers.i18n = OpenLayers.Lang.translate;