js生成GUID

var guidGenerator = function() {
		var S4 = function () {
			return (((1 + Math.random())*0x10000)|0).toString(16).substring(1);
		};
		return (S4()+S4()+"-"+S4()+"-"+S4()+"-"+S4()+"-"+S4()+S4()+S4());
	};