wikiplus_utf8convert.js

function convert(str){
	function getUTF8Length(first3){
		var code = parseInt(first3.substr(1), 16);
		if((code >> 7 & 1) == 0) return 1;
		if((code >> 6 & 1) == 0) return 0;
		if((code >> 5 & 1) == 0) return 2;
		if((code >> 4 & 1) == 0) return 3;
		if((code >> 3 & 1) == 0) return 4;
		return 0;
	}
	return str.replace(/(\.[A-F0-9]{2})+/g, function($0){
		var res = "";
		for(var i = 0; i < $0.length;){
			var thisstr = $0.substr(i, 3);
			var ul = getUTF8Length(thisstr);			
			if(ul == 0){
				res += thisstr;
				i += 3;
				continue;
			}else{
				res += decodeURIComponent($0.substr(i, 3 * ul).replace(/\./g, '%'));
				i += 3 * ul;
			}
		}
		return res;
	});
}