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es6学习地址:http://gank.io/post/564151c1f1df1210001c9161
es5学习地址:http://www.zhangxinxu.com/wordpress/2013/04/es5%E6%96%B0%E5%A2%9E%E6%95%B0%E7%BB%84%E6%96%B9%E6%B3%95/#foreach
es6学习地址:http://gank.io/post/564151c1f1df1210001c9161