/**
 * 生成唯一id,用于网络请求标识
 */
export default function uuid() {
	return 'xxxxxxxxxxxx4xxxyxxxxxxxxxxxxxxx'.replace(/[xy]/g, function (c) {
		var r = Math.random() * 16 | 0,
			v = c == 'x' ? r : (r & 0x3 | 0x8);
		return v.toString(16);
	});
}
