大约有 500 项符合查询结果（耗时：0.0130秒） [XML]
App Inventor 2 图片处理教程 - 缩放、裁剪、存储与转换 · App Inventor 2 中文网
...function resizeImage(dataUrl, maxW, maxH) {
var img = new Image();
img.onload = function() {
var ratio = Math.min(maxW / img.width, maxH / img.height);
var w = Math.floor(img.width * ratio);
var h = Math.floor(img.height * ratio);
var canvas = document.getElementById('canvas');
...
App Inventor 2 图像矫正教程 - 透视变换与文档扫描 · App Inventor 2 中文网
...")){
var base64 = msg.substring(8);
var img = new Image();
img.onload = function(){
// 透视变换矫正
var src = cv.imread(img);
var dst = new cv.Mat();
// 定义原始四角和目标四角
var srcPts = cv.matFromArray(4, 1, cv.CV_32FC2, [100,50, 350,30, ...
App Inventor 2 CustomWebView 拓展：高级版Web浏览器，完美浏览现代Web前...
...id,url,message)
Event raised when Js have to show an alert to user
OnJsConfirm(id,url,message)
Tells to display a confirm dialog to the user.
OnJsPrompt(id,url,message,defaultValue)
Event raised when JavaScript needs input from user
OnNewWindowRequest(id,isDialog,isPopup)
Event raised ...
[SOLVED] Can't send payload > 23bytes(MTU setted to 128bytes) - #9 by ...
...lace to request an MTU change.
From the name of the event, I imagine it is confirming the success of the attempt to change the MTU that you did not yet submit (a temporal anomaly)
Here is the doc page:
http://iot.appinventor.mit.edu/#/bluetoothle/bluetoothleintro
Here is the doc for the event:
MTU...
MQTT物联网协议完全实践指南 · App Inventor 2 中文网
...}
when Button_PublishQoS2.Click() {
UrsPahoMqttClient1.Publish("payment/confirm", "SUCCESS", 2)
}
3. 主题设计与最佳实践
主题命名规范：
{namespace}/{device_type}/{device_id}/{attribute}/{action}
示例：
home/thermostat/livingroom/temperature/set
office/...
MQTT物联网协议完全实践指南 · App Inventor 2 中文网
...n Button_PublishQoS2.Click
do
call UrsPahoMqttClient1.Publish "payment/confirm", "SUCCESS", 2
3. 主题设计与最佳实践
主题命名规范：
{namespace}/{device_type}/{device_id}/{attribute}/{action}
示例：
home/thermostat/livingroom/temperature/set
office/lig...
App Inventor 2 CustomWebView 拓展：高级版Web浏览器，完美浏览现代Web前...
...essage)
当JavaScript需要向用户显示警告时触发的事件
OnJsConfirm(id,url,message)
告诉显示确认对话框给用户。
OnJsPrompt(id,url,message,defaultValue)
当JavaScript需要用户输入时触发的事件
OnNewWindowRequest(id,isDialog,isPopup)
当webview请求新...
App Inventor 2 项目合并工具 AIMerge · App Inventor 2 中文网
...ent project files, there is no need to merge another project. Click No and confirm that you want to close the merger. For more information about merging more than two project see the Merging More Than Two Projects section below.
Upload Final Project to App Inventor
The .aia f...
App Inventor 2 AsciiConversion 拓展，ASCII编码与解码，Ascii码转换 · App Inventor 2 中文网
...
.aix 拓展下载：
AsciiConversion.aix
demo程序下载：
test_AsciiConversion.aia
此扩展允许用户将 Ascii 代码(列表)转换为相应的文本，也可以将指定的字符转换为相应的 Ascii 代码。
此扩展提供 3个 函数：
AsciiCode: 给出字...
Error 908: Permission Receive SMS - #5 by Taifun - MIT App Inventor Help - MIT App Inventor Community
...ibute it via the website. The “u” version of the companion allows live testing of apps that use the aforementioned functionality that Google has deemed questionable. In the Google Play published version, this functionality simply won’t work or will raise a permission error.
The companion is ...