SKILLNULL, Author at SKILL.NULL

echarts获取坐标上的点距离顶部底部高度

const height = echarts_instance.getHeight()

const max_distance = (max_y - y_value) / (max_y - min_y) * height;

const min_distance = (y_value - min_y) / (max_y - min_y) * height;

2025-11-11by SKILLNULL 其他阅读(28)评论(0)

Let`s Encrypt 生成免费自动续签 HTTPS 证书

Lets Encrypt是一个免费的证书授权机构(CA)，其通过ACME 协议接口自动签发数字证书，来让你省去证书过期的烦恼。

ACME客户端有很多，Lets Encrypt 官网推荐Certbot ，下面是具体获取免费证书的流程：

一、安装 Certbot 客户端
[crayon-6[……]

2025-11-04by SKILLNULL 其他阅读(100)评论(0)

vim代码高亮

编辑或创建文件.vimrc
vim ~/.vimrc
在.vimrc文件中开启语法高亮配置:
syntax on

2025-10-30by SKILLNULL 其他阅读(128)评论(0)

H5滚动截取长图

使用开源库：html2canvas

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<!DOCTYPE html>

<head>

<title>H5滚动截长图示例</title>

<style>

body {

font-family: 'Arial', sans-serif;

margin: 0;

padding: 20px;

background-color: #f5f7fa;

}

.container {

max-width: 800px;

margin: 0 auto;

background: white;

padding: 20px;

border-radius: 10px;

box-shadow: 0 2px 10px rgba(0,0,0,0.1);

}

h1 {

color: #333;

text-align: center;

}

.controls {

display: flex;

justify-content: center;

gap: 10px;

margin: 20px 0;

}

button {

padding: 10px 20px;

background: #4CAF50;

color: white;

border: none;

border-radius: 5px;

cursor: pointer;

transition: background 0.3s;

}

button:hover {

background: #45a049;

}

#result {

margin-top: 20px;

text-align: center;

}

#content {

margin-top: 30px;

padding: 20px;

background: #f9f9f9;

border-radius: 5px;

}

.section {

margin-bottom: 30px;

padding: 15px;

background: white;

border-radius: 5px;

box-shadow: 0 1px 3px rgba(0,0,0,0.1);

}

.loading {

display: none;

text-align: center;

margin: 20px 0;

color: #666;

}

</style>

</head>

<body>

<h1>H5滚动截长图示例</h1>

</div>

<div class="loading" id="loading">正在生成截图，请稍候...</div>

<h2>测试内容区域</h2>

</div>

// 生成测试内容

const longContent = document.getElementById('longContent');

for (let i = 1; i <= 20; i++) {

const section = document.createElement('div');

section.className = 'section';

section.innerHTML = `

<p>这是自动生成的测试内容段落 ${i}，用于演示长页面截图功能。</p>

</div>

longContent.appendChild(section);

}

let generatedImage = null;

document.getElementById('captureBtn').addEventListener('click', async function() {

const loading = document.getElementById('loading');

const result = document.getElementById('result');

const captureBtn = document.getElementById('captureBtn');

const downloadBtn = document.getElementById('downloadBtn');

loading.style.display = 'block';

result.innerHTML = '';

captureBtn.disabled = true;

try {

// 获取整个文档高度

const body = document.body;

const html = document.documentElement;

const height = Math.max(

body.scrollHeight,

body.offsetHeight,

html.clientHeight,

html.scrollHeight,

html.offsetHeight

);

// 使用html2canvas截图

const canvas = await html2canvas(document.querySelector("#capter"), {

scale: 2, // 高清截图

scrollY: -window.scrollY, // 修正滚动位置

windowHeight: height, // 设置窗口高度为整个页面高度

useCORS: true, // 允许跨域图片

allowTaint: true,

logging: true

});

generatedImage = canvas.toDataURL('image/png');

result.innerHTML = `<img src="${generatedImage}" style="max-width:100%; border:1px solid #ddd; border-radius:5px;">`;

downloadBtn.disabled = false;

} catch (error) {

console.error('截图失败:', error);

result.innerHTML = `<p style="color:red;">截图失败: ${error.message}</p>`;

} finally {

loading.style.display = 'none';

captureBtn.disabled = false;

}

});

document.getElementById('downloadBtn').addEventListener('click', function() {

if (!generatedImage) return;

const link = document.createElement('a');

link.download = 'fullpage-screenshot.png';

link.href = generatedImage;

link.click();

});

</script>

</body>

</html>

2025-09-10by SKILLNULL HTML&CSS, 前端阅读(405)评论(0)

ReactNative常见问题及处理

芯片：Apple M2

macOS: 13.3

react-native: 0.70.0

Xcode: 14.3.1

#### Mac IOS 常见问题

> boost 问题修复

将 /node_modules/react-native/third-party-podspecs/boost.podspec 中对应内容修改如下：

```shell

spec.source = { :http => 'https://sourceforge.net/projects/boost/files/boost/1.76.0/boost_1_76_0.tar.bz2',

:sha256 => 'f0397ba6e982c4450f27bf32a2a83292aba035b827a5623a14636ea583318c41' }

```

> We ran "xcodebuild" command but it exited with error code 65.

全局将 IPHONEOS_DEPLOYMENT_TARGET 的值替换成 12.4

> "RNSScreenStackHeaderConfig" was not found in the UIManager.

1、 "react-native-safe-area-context": "^3.4.1"

"react-native-screens": "3.25.0"

2、 cd ios & pod install

3、全局将 IPHONEOS_DEPLOYMENT_TARGET 的值替换成 12.4

> make sure you`re running a package server or have included a .jsbundle file in your application bundle.

如果有提示: [oh-my-zsh] Would you like to update? [Y/n]

更新zsh后，重启ios

2025-07-04by SKILLNULL ReactNative 阅读(1062)评论(0)

根据.nvmrc自动切换项目所需node版本

vi ~/.bash_profile

插入一下内容

switch_node() {

local nvmrc_path="$(nvm_find_nvmrc)"

if [ -n "$nvmrc_path" ]; then

echo '根据.nvmrc切换node版本'

nvm use

}

switch_node

souce ~/.bash_profile

再打开命令行就会根据.nvmrc切换node版本。

注意：要先安装nvm

2025-04-23by SKILLNULL NodeJS 阅读(595)评论(0)

Command PhaseScriptExecution failed with a nonzero exit code

打开 ios/.xcode.env 文件

找到 export NODE_BINARY=$(command -v node)

更改为: export NODE_BINARY=your_node_path

[crayon-691618b66c3317127468[……]

2025-04-23by SKILLNULL ReactNative 阅读(663)评论(0)

echarts双Y轴，实现均分为包含刻度0的指定段数，同时对齐刻度

要实现强制分为指定段数，并且对齐刻度，需要用的配置分别为yAxis的max、min、interval

echarts5.3有个配置项alignTicks，在多个 y 轴为数值轴的时候，可以开启该配置项自动对齐刻度。只对 'value'和[cr[……]

2025-08-28by SKILLNULL 前端阅读(675)评论(0)

env(safe-area-inset-bottom) 兼容写法

@supports 兼容性很好，所以使用 @supports 做兼容是个不错的选择。

例：

@supports (padding-bottom: env(safe-area-inset-bottom)) or (padding-bottom: constant(safe-area-inset-bottom)) {

.your-dom {

padding-bottom: constant(safe-area-inset-bottom); /* 兼容 iOS < 11.2 */

padding-bottom: env(safe-area-inset-bottom); /* 兼容 iOS >= 11.2 */

}

@supports not (

(padding-bottom: env(safe-area-inset-bottom)) or

(padding-bottom: constant(safe-area-inset-bottom))

) {

.your-dom {

padding-bottom: 20px;

}

2025-10-14by SKILLNULL Browser Compatibility, HTML&CSS, 前端阅读(1793)评论(0)

缩放实现0.5px

一、

&::after {

content: "";

position: absolute;

top: -50%;

bottom: -50%;

left: -50%;

right: -50%;

border: 1px solid #e9e9e9;

border-radius: 2px;

-webkit-transform: scale(0.5);

transform: scale(0.5);

}

二、

&::after {

content: "";

position: absolute;

top: 0;

left: 0;

width: 200%;

height: 200%;

transform-origin: 0 0;

border-width: 1px;

border-style: solid;

border-radius: 50%;

-webkit-transform: scale(0.5);

transform: scale(0.5);

box-sizing: border-box;

}

2025-07-31by SKILLNULL HTML&CSS, 其他阅读(1424)评论(0)

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