小编Del*_*ain的帖子

每次我尝试使用安装包时npm install，都会出现npm ERR! Tracker "idealTree:inflate:" already exists错误。

我尝试过删除node_modules和清除缓存，但没有运气。

如何在Bootstrap 4列中获得自动宽度？

我需要连续2列没有固定宽度,是否可能？

考拉版:2.2.0

错误消息:/scss/styles.scss /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/dependency.rb:319:in to_specs':找不到' 15个总宝石中的sass'(> = 0)(Gem :: LoadError)选中'GEM_PATH =/Users/monstercritic/.gem/ruby​​/2.3.0:/Library/Ruby/Gems/2.3.0: /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/gems/2.3.0',executegem envfor来自/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/的更多信息lib/ruby​​/2.3.0/ruby​​gems/dependency.rb:328:into_spec'来自/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_gem. rb:65:在gem中来自/Applications/Koala.app/Contents/Resources/app.nw/bin/sass:17:in

我已经为 React 制作了一个 NPM 包，它在 Node 上运行良好，但在没有 node 的浏览器上无法运行。

如果我像这样在节点中导入：

import Progress from 'package-name'

// jsx
<Progress /> //working fine

它工作正常。

但是如果我像 unpkg 这样从 CDN 使用它，它就不起作用。

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.4.2/react.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.4.2/react-dom.js"></script>

// Package Script
<script src="https://unpkg.com/@delowar/react-circle-progressbar@0.0.9/lib/Progress.js"></script>

<script>
    ...react code...
    <Progress />
    ...react code...
</script>

它显示一个错误：

未定义进度

任何人都可以帮我解决这个问题吗？

网络包配置：

var path = require('path');

module.exports = {
    mode: 'production',
    entry: './src/Progress.js',
    output: {
        path: path.resolve('lib'),
        filename: 'Progress.js',
        libraryTarget: 'umd',
        library: 'lib',
        umdNamedDefine: true,
        globalObject: `(typeof self !== 'undefined' ? self : this)`
    }, …

当我运行npm install express --save此命令时，出现错误。任何人都可以帮我解决这个问题吗？

错误：

> fsevents@1.2.11 install /Users/delowar/Desktop/ytdl/node_modules/chokidar/node_modules/fsevents
> node-gyp rebuild

No receipt for 'com.apple.pkg.CLTools_Executables' found at '/'.

No receipt for 'com.apple.pkg.DeveloperToolsCLILeo' found at '/'.

No receipt for 'com.apple.pkg.DeveloperToolsCLI' found at '/'.

gyp: No Xcode or CLT version detected!
gyp ERR! configure error
gyp ERR! stack Error: `gyp` failed with exit code: 1
gyp ERR! stack     at ChildProcess.onCpExit (/usr/local/lib/node_modules/npm/node_modules/node-gyp/lib/configure.js:351:16)
gyp ERR! stack     at ChildProcess.emit (events.js:321:20)
gyp ERR! stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:275:12)
gyp ERR! System Darwin 19.2.0
gyp …

如何偏移表格行中的一列？我使用了 colspan 但它需要两列宽度，但我想喜欢这张图片。

这是我的代码：

table, th, td {
    border: 1px solid black;
    border-collapse: collapse;
}

th, td {
    padding: 5px 15px;
    text-align: left;    
}

<table> 
    <tr> 
        <th colspan="2">65</th> <th colspan="2">40</th> 
        <th colspan="2">20</th> 
    </tr> 
    <tr> 
        <th>Men</th> 
        <th>Women</th> 
        <th>Men</th> 
        <th>Women</th> 
        <th>Men</th> 
        <th>Women</th> 
    </tr> 
    <tr> 
         <td>85</td> 
         <td>78</td> 
         <td>82</td> 
         <td>77</td> 
         <td>81</td> 
    </tr> 
</table>

升级到macOS Catalina Beta后，Ruby sass无法正常工作。

当我运行时sudo gem install sass，出现错误：

ERROR:  Error installing sass:
    ERROR: Failed to build gem native extension.

    current directory: /Library/Ruby/Gems/2.6.0/gems/ffi-1.11.1/ext/ffi_c
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/bin/ruby -I /Library/Ruby/Site/2.6.0 -r ./siteconf20191007-37566-177grvx.rb extconf.rb
mkmf.rb can't find header files for ruby at /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/include/ruby.h

You might have to install separate package for the ruby development
environment, ruby-dev or ruby-devel for example.

extconf failed, exit code 1

Gem files will remain installed in /Library/Ruby/Gems/2.6.0/gems/ffi-1.11.1 for inspection.
Results logged to /Library/Ruby/Gems/2.6.0/extensions/universal-darwin-19/2.6.0/ffi-1.11.1/gem_make.out```

使用此代码获取错误(SyntaxError:无效语法)

score = [a*a in range(1, 100) if (a*a)%2 is 0 and str(a*a)[-1] is '0']
print(score)

结果:

SyntaxError: invalid syntax

但是当我使用它而没有列表理解方法时,相同的代码工作正常.

score = []
for a in range(1,100):
    if (a*a)%2 is 0 and str(a*a)[-1] is '0':
        score.append(a*a)
print(score)

结果:

[100, 400, 900, 1600, 2500, 3600, 4900, 6400, 8100]