我偶然发现了一些javascript语法似乎应该产生某种类型的解析错误但不会:
if (true, true) {console.log('splendid')} else {console.log('horrid')} // splendid
if (true, false) {console.log('splendid')} else {console.log('horrid')} // horrid
虽然所有表达式都被执行,但似乎只有最后一个表达式会影响逻辑:
if (console.log('super'), true) {console.log('splendid')} // super splendid
任何人都知道为什么这是有效的JavaScript语法？它有什么实际用途吗？
有没有人有一个片段可以将jquery加载到firebug的任何页面上？我经常遇到我更喜欢使用熟悉的jq语法检查的网站.
例如,假设我想从页面中提取价格列表 - 最好是启动firebug,从谷歌CDN安装jquery,然后输入$('li.prices').每个(...).
I have a Sinatra app with a long running process (a web scraper). I'd like the app flush the results of the crawler's progress as the crawler is running instead of at the end.
I've considered forking the request and doing something fancy with ajax but this is a really basic one-pager app that really just needs to output a log to a browser as it's happening. Any suggestions?
//当我点击cmd- /时,Sublime的Haml语法用于注释.我想改写它的使用-#.我怎么做？