小编Caq*_*aqu的帖子

mx:TextArea的旧方法不再有效.特别:

myMxTextArea.verticalScrollPosition = myMxTextArea.maxVerticalScrollPosition;

我已经为Spark发现了这种方法,但看起来有点笨拙:

mySparkTA.scrollToRange(mySparkTA.text.length-1, mySparkTA.text.length);

有没有更简单的方法来做到这一点？

In React Hooks documents it is shown how to removeEventListener during the component's cleanup phase. https://reactjs.org/docs/hooks-reference.html#conditionally-firing-an-effect

In my use case, I am trying to removeEventListener conditional to a state property of the functional component.

Here's an example where the component is never unmounted but the event listener should be removed:

function App () {
  const [collapsed, setCollapsed] = React.useState(true);
  React.useEffect(
    () => {
      if (collapsed) {
        window.removeEventListener('keyup', handleKeyUp); // Not the same "handleKeyUp" :(
      } else {
        window.addEventListener('keyup', handleKeyUp);
      } …

我正在尝试使用less-plugin-clean-css和grunt-contrib-less,但我无法让它运行.似乎grunt配置无法找到或安装插件.这是我维护的一个bootstrap的分支.

我用以下内容更新了Gruntfile.js:

grunt.initConfig({
...
less: {
  compileCore: {
    options: {
      strictMath: true,
      sourceMap: true,
      outputSourceFiles: true,
   +  plugins: [
   +    (new require('less-plugin-clean-css')({
   +      "advanced": true,
   +      "compatibility": "ie8"
   +    }))
   +   ],
      sourceMapURL: '<%= pkg.name %>.css.map',
      sourceMapFilename: 'dist/css/<%= pkg.name %>.css.map'
    },
    src: 'less/bootstrap.less',
    dest: 'dist/css/<%= pkg.name %>.css'
  ...
  }
},

安装插件:

npm install less-plugin-clean-css --save-dev

运行grunt并获取此错误:

Running "less:compileCore" (less) task
>> TypeError: Cannot read property 'install' of undefined

我错过了什么？

我是优雅单行的忠实粉丝.我正在尝试编写一个单行测试,在执行http请求和搜索后输出"pass"或"fail".我尝试过这样的事情:

curl "http://haystack.io" | sed 's/.*?needle.*/PASS/' || echo FAIL

......但这不会失败.

还尝试过:

curl "http://haystack.io" | if [$(grep -oE "needle") = "needle"]; then echo PASS; else echo FAIL; fi

...但我无法正确理解语法.

我怎样才能做到这一点？