小编Rob*_*Rob的帖子

在我的NodeJSv4.1.1代码中使用Babel.

得到了需要挂钩:

require("babel-core/register");

$appRoot = __dirname;

module.exports = require("./lib/controllers/app");

在随后的lodaded .js文件中,我正在做:

import { Strategy as LocalStrategy } from "passport-local";

但是,这会在CLI中生成以下错误:

import { Strategy as LocalStrategy } from "passport-local";
^^^^^^

SyntaxError: Unexpected reserved word
    at exports.runInThisContext (vm.js:53:16)
    at Module._compile (module.js:413:25)
    at loader (/Users/*/Documents/Web/*/node_modules/babel-core/node_modules/babel-register/lib/node.js:128:5)
    at Object.require.extensions.(anonymous function) [as .js] (/Users/*/Documents/Web/*/node_modules/babel-core/node_modules/babel-register/lib/node.js:138:7)
    at Module.load (module.js:355:32)
    at Function.Module._load (module.js:310:12)
    at Module.require (module.js:365:17)
    at require (module.js:384:17)
    at module.exports (index.js:9:5)
    at Object.<anonymous> (app.js:102:39)

我正在尝试为我的网站托管Google Material Design图标集但是我无法在Chrome或Safari中显示图标.

我正在使用这个CSS文件:

@font-face {
  font-family: 'Material Icons';
  font-style: normal;
  font-weight: 400;
  src: url(/public/dist/font/Material-Design-Icons.eot); /* For IE6-8 */
  src: url(/public/dist/font/Material-Design-Icons.woff2) format('woff2'),
       url(/public/dist/font/Material-Design-Icons.woff) format('woff'),
       url(/public/dist/font/Material-Design-Icons.ttf) format('truetype');
}

.material-icons {
  font-family: 'Material Icons';
  font-weight: normal;
  font-style: normal;
  font-size: 24px;  /* Preferred icon size */
  display: inline-block;
  width: 1em;
  height: 1em;
  line-height: 1;
  text-transform: none;
  letter-spacing: normal;
  word-wrap: normal;
  white-space: nowrap;
  direction: ltr;

  /* Support for all WebKit browsers. */
  -webkit-font-smoothing: antialiased;
  /* Support for Safari and Chrome. */
  text-rendering: optimizeLegibility;

  /* …

我有一个需要去抖动的字段的onchange事件,我正在使用下划线,但是当我使用debouncer时,传递给React处理程序的事件似乎已过时.

<div className='input-field'>
  <input onChange={_.debounce(this.uriChangeHandler.bind(this), 500)} id='source_uri' type='text' name='source_uri' autofocus required />
  <label htmlFor='source_uri'>Website Link</label>
</div>

uriChangeHandler(event) {
    event.preventDefault();
    let uriField = $(event.target);
    let uri = uriField.val();
    this.setState({
        itemCreateError: null,
        loading: true
    });
    this.loadUriMetaData(uri, uriField);
}

我收到这个错误: Warning: This synthetic event is reused for performance reasons. If you're seeing this, you're calling preventDefault on a released/nullified synthetic event. This is a no-op. See https://fb.me/react-event-pooling for more information.

使用onchange w/o debouncer工作正常.

我有一个服务工作者为我的网站,但我不知道如何在出现网络错误时处理它,我查看了Mozilla的指南,但是当我离线运行工作程序时,它说网络错误已通过对respondWith函数而言,catch承诺似乎没有响应缓存数据.

this.addEventListener('install', function(event) {
  event.waitUntil(
    caches.open('v1').then(function(cache) {
      return cache.addAll([
        '/',
        '/favicon.ico',
        '/f3be2e30f119a1a9b0fdee9fc1f477a9',
        '/index.html',
        '/sw.js'
      ]);
    })
  );
});

this.addEventListener('fetch', function(event) {
    var response;
    event.respondWith(caches.match(event.request).catch(function() {
        return fetch(event.request);
    })).then(function(r) {
        response = r;
        caches.open('v1').then(function(cache) {
            cache.put(event.request, response);
        });
        return response.clone();
    }).catch(function(event) {
        console.log(event, 'borken');
        return caches.match(event.request);
    });
});

错误日志显示在此处:

这是我的任务：编写一个函数：

onlyDigits :: String -> String

从字符串中去除所有非数字字符（例如，onlyDigits“ ac245d62”为“ 24562”）。

我有这个：

onlyDigits :: String -> String
onlyDigits a = [ (not)isAlpha b | b <- a ]

但我不能编译它

谁能看到我哪里出问题了？