ionic ion-tab图标修改, 自定义tab图标

<ion-view hide-back-button="false">
<style>
.ion-ios-home0 {
background: url(img/home0.png) no-repeat 50% 50%;
background-size: 20px 20px;
}

.ion-ios-book0 {
background: url(img/book0.png) no-repeat center ;
background-size: 20px 20px;
}

.ion-android-person0 {
background: url(img/person0.png) no-repeat center ;
background-size: 20px 20px;
}

.ion-ios-home1 {
background: url(img/home1.png) no-repeat center ;
background-size: 20px 20px;
}

.ion-ios-book1 {
background: url(img/book1.png) no-repeat center ;
background-size: 20px 20px;
}

.ion-android-person1 {
background: url(img/person1.png) no-repeat center ;
background-size: 20px 20px;
}

</style>
<ion-tabs class="tabs-icon-top tabs-color-active-assertive tabs-light" ng-class="{'tabs-item-hide': $root.hideTabs}" delegateHandle="main">
<ion-tab title="首页" icon="ion-ios-home0" nav-direction="swap" icon-on="ion-ios-home1" href="#/home/index/code/">
<ion-nav-view name="tab-index"></ion-nav-view>
</ion-tab>
<ion-tab title="学习" icon="ion-ios-book0" nav-direction="swap" icon-on="ion-ios-book1" href="#/home/inread">
<ion-nav-view name="tab-inread"></ion-nav-view>
</ion-tab>
<ion-tab title="我的" icon="ion-android-person0" nav-direction="swap" icon-on="ion-android-person1" href="#/home/user-center">
<ion-nav-view name="tab-usercenter"></ion-nav-view>
</ion-tab>
</ion-tabs>
</ion-view>