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很多同学在进行编程学习时缺乏系统学习的资料。本页面基于previous内容，从基础理论到综合实战，通过实用的知识类文章，标准的编程教程，丰富的视频课程，为您在previous相关知识领域提供全面立体的资料补充。同时还包含 package、package文件、padding 的知识内容，欢迎查阅！

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$ionicHistory API的相关知识
$ionicHistory 定义：$ ionicHistory在用户浏览应用程序时跟踪页面。获取页面信息，进行页面跳转操作。特点：Should a user navigate few pages deep on one tab, and then switch to a new tab and back, the back button relates not to the previous tab, but to the previous pages visited within that tab.记录历史界面，而不会在两个界面中来回返回。方法列表：viewHistory()返回该应用程序的视图历史数据，如所有的视图和历史记录Returns: objectReturns an object containing the apps view history data.currentView()该应用程序的当前视图。Returns: objectReturns the current view.current
android6.0官方教程笔记——Starting Another Activity
After completing the previous lesson, you have an app that shows an activity (a single screen) with a text field and a button. In this lesson, you’ll add some code to MyActivity that starts a new activity when the user clicks the Send button. Ⅰ.Respond to the Send Button 1.In Android Studio, from the res/layout directory, edit the activity_my.xml file. 2.To the <Button> element, add the an
微信小程序实现类3D轮播图
在写微信小程序时，有写到实现3D轮播图的效果，可以直接使用微信小程序中自带的组件swiper来实现效果图如下：image.png1.swiper的相关属性indicator-dots 是否显示小圆点，也可以自己重新设置小圆点circular 是否衔接滑动，就是实现无限滚动previous-margin 与上一张图片的间距next-margin 与下一张图片的间距autoplay 实现自动滚动这里主要利用了circular实现无限滚动，然后再加上前后间距，再设置图片的层级和透明度就可以实现了,将图片及容器的高度设置好就差不多可以实现了wxml文件<swiper class="imageContainer" bindchange="handleChange" previous-margin="50rpx" next-margin="5
MySQL DELETE JOIN语句
Summary: in this tutorial, we’ll show you how to delete data from multiple tables by using MySQL DELETE JOIN statement.In the previous tutorial, we showed you several ways to delete records from multiple tables by using:A single DELETE statement on multiple tables.A single DELETE statement on multiple tables where the child tables have ON DELETE CASCADE referential actions for the foreign keys.This tutorial