simple template, data substitute

substitute.js

function substitute(str, obj) {
    if (typeof str === 'string' && typeof obj === 'object') {
		str = str.replace(/\{(\w+)\}/gi, function(s, k) {
			return (typeof obj[k] === 'undefined') ? s : obj[k];
		}).replace(/(\\\{)|\\\}/g, function(s, k) {
			return k ? '{' : '}';
		});
	}
	return str;
}