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APP INVENTOR硬件交互学习教程06——硬件参数上报 - 创客硬件开发 - 清泛IT...
...节主要实现硬件参数上报，板子接收到指令，执行后反馈一个状态给APP。
1.界面组件
增加两个标签，一个布局，一个文本输入框
2.程序逻辑
增加接收处理和显示判断
3.arduino nano代码
// 引脚定义
const int ledPin1 = &nbs...
输入框输入内容为空的提示编写求助 - App Inventor 2 中文网 - 清泛IT社区...
...的话，对话框会进行提示呢（要对文本框的填写情况进行一个是否填写的判断，但是自己尝试了一下弄不出来）
就一个非空判断，参考如下：
App Inventor 2 发表于 2024-10-31 10:44
就一个非空判断，参考如下：
ok，感谢
输入-选中项索引值-查看下拉框中的选中项内容 - App Inventor 2 中文网 - ...
...加了1个下拉框，并用字符串输入了20个选择项（数字），一个按纽健，一个文本输入框（用于输入选择项的索引值），一个标签（用于显示输入的索引值对应的选择项内容，网上查看了下编码过程，但文字叙述还是一头雾水没理...
【生成Python】AppInventor2中文网已支持代码块转换Python源码！ - App Inv...
...需求，部分节选如下：
Python代码转换功能就属于其中一个，可不止这一个需求引人注意，还有好几个细节就算放在2025年的当下都不过时的功能理念，但不知怎的到了实际产品貌似都没有实现，个中细节这里不做考究，有兴趣...
SOAP or REST for Web Services? [closed]
...use-click in modern IDEs.
If your consumers are more likely to be RIAs or Ajax clients, you will probably want something simpler than SOAP, and more native to the client (notably JSON).
JSON packets sent over HTTP is not necessarily a REST architecture, it's just messages to URLs. All perfectly wo...
Knight's Shortest Path on Chessboard
...>'+html+'</table>';
$body.append(html);
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
Note: The jQuery used for only illustration, for code see distance function.
...
Compiling dynamic HTML strings from database
...lt;script data-require="angular.js@1.0.7" data-semver="1.0.7" src="https://ajax.googleapis.com/ajax/libs/angularjs/1.0.7/angular.js"></script>
<script src="script.js"></script>
</head>
<body>
<h1>Compile dynamic HTML</h1>
<div ng-contr...
In AngularJS, what's the difference between ng-pristine and ng-dirty?
... already typed anything in the related field:
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.0.8/angular.min.js"></script>
<form ng-app="" name="myForm">
<input name="email" ng-model="data.email">
<div class="info" ng-show="myForm.email.$pristin...
jQuery selectors on custom data attributes using HTML5
...ata-company$="book"]',group).css('color','pink');
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<ul data-group="Companies">
<li data-company="Microsoft">Microsoft</li>
<li data-company="Google">Google</li>
...
What is the difference between ng-if and ng-show/ng-hide
... array.splice(array.indexOf(item), 1);
}
})
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app='app' ng-controller='ctrl'>
<h4>ng-if:</h4>
<ul ng-init='arr1 = [1,2,3]'>
<li ng-repea...