ランダム文字列の取得（日本語対応）

RndText.js

var RndText = function(){
	this.strCodes = {
		ja : [
			{ //hiragana
				start: 0x3041,
				end: 0x309f
			},
			{ //katakana
				start: 0x30a0,
				end: 0x30ff
			},
			{ //cjk
				start: 0x4e00,
				end: 0x9fcf
			}
		],
		en: {
			start: 0x021,
			end: 0x07E
		}
	};
};

RndText.prototype.checkType = function(type, obj){
	var clas = Object.prototype.toString.call(obj).slice(8, -1);
	return obj !== undefined && obj !== null && clas === type;
};

RndText.prototype.getString = function(langCode){
	langCode = langCode || 'en';
	var lang = this.strCodes[langCode], result = [];
	if(this.checkType('Array', lang)){
		var i = 0, length = lang.length;
		for(; i < length; i += 1){
			result.push( String.fromCharCode( Math.floor( Math.random() * (lang[i].end - lang[i].start + 1 ) + lang[i].start ) ) );
		}
		result = result[ Math.floor(Math.random() * result.length)].replace(/\s/g, '');
	}else{
		result = String.fromCharCode( Math.floor( Math.random() * ( lang.end - lang.start + 1 ) ) );
	}
	return result.toString();
};

RndText.prototype.getStrings = function(langCode, length){
	length = length || 1;
	var i = 0, result = [];
	for(; i < length; i += 1){
		result.push(this.getString(langCode));
	}
	return result.join('');
};