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How to find the array index with a value?
... {value: 400},
{value: 500}
];
var index = imageList.map(function (img) { return img.value; }).indexOf(200);
console.log(index);
In modern browsers you can use findIndex:
var imageList = [
{value: 100},
{value: 200},
{value: 300},
{value: 400},
{value: 50...
Is it possible to ping a server from Javascript?
...his.callback = callback
this.ip = ip;
var _that = this;
this.img = new Image();
this.img.onload = function() {_that.good();};
this.img.onerror = function() {_that.good();};
this.start = new Date().getTime();
this.img.src = "http://" + ip;
this.timer = setTimeout(f...
configure: error: png.h not found.错误的解决方法 - 更多技术 - 清泛网 -...
configure: error: png.h not found.错误的解决方法yum install libpng-develyum install libpng-develpng.h
图像转换拓展：用于转换jpg/png/webp（以及更多）等图片格式的扩展 - App I...
...图像转换为/从以下三种格式之一进行转换的功能：jpg、png 和 webp。
包括增强的图像功能：转换、旋转、调整大小、设置不透明度、裁剪、尺寸（宽度、高度、大小）、缩略图。支持完整路径和绝对路径。
来源：https://com...
How to remove frame from matplotlib (pyplot.figure vs matplotlib.figure ) (frameon=False Problematic
...und color when saving unless you specify otherwise (e.g. fig.savefig('blah.png', transparent=True)).
However, to remove the axes' and figure's background on-screen, you'll need to set both ax.patch and fig.patch to be invisible.
E.g.
import matplotlib.pyplot as plt
fig, ax = plt.subplots()
ax....
浅谈Heatmap：网页热点图生成原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...e(1000, 1000, new ImagickPixel('white'));
$heatmap_image->setImageFormat('png');
$plot_image = new Imagick('plot.png');
$iterator = $plot_image->getPixelIterator();
foreach($iterator as $row) {
foreach ($row as $pixel) {
$colors = $pixel->getColor();
foreach (array('r'...
What is a simple/minimal browserconfig.xml for a web site
...on>
<tile>
<square70x70logo src="/mstile-70x70.png"/>
<square150x150logo src="/mstile-150x150.png"/>
<wide310x150logo src="/mstile-310x150.png"/>
<square310x310logo src="/mstile-310x310.png"/>
<TileColor>#8bc53f&l...
App Inventor 2 SQLite 拓展：超流行兼容主流SQL语法的迷你本地数据库引擎 ...
...们 发布日志 服务条款 教育 入门必读 中文教程 IoT专题 AI2拓展 ChatGPT接入 Aia Store 开通VIP 搜索 ...
How do I center floated elements?
...margin-left: 3px;
background: url(/images/structure/pagination-button.png);
}
(remove the lines starting with - and add the lines starting with +.)
.pagination {
text-align: center;
}
.pagination a {
+ display: inline-block;
width: 30px;
height: 30px;
margin-left: 3px;
...
How can I extract a good quality JPEG image from a video file with ffmpeg?
...
Output the images in a lossless format such as PNG:
ffmpeg.exe -i 10fps.h264 -r 10 -f image2 10fps.h264_%03d.png
Then use another program (where you can more precisely specify quality, subsampling and DCT method – e.g. GIMP) to convert the PNGs you want to JPEG.
It ...