说明： ionic1和ionic2的区别：
主要从几个方面说明了ionic1和ionic2的不同，ionic2的推出是依赖angular2的变化而变化的，所以要想学好ionic2，还需要把angular2先学好 (The difference between ionic1 and ionic2: mainly from several aspects of the difference between ionic1 and ionic2, the introduction of ionic2 is dependent on changes in angular2 and change, so in order to learn ionic2, you need to learn angular2 first)
