使用正则表达式要简单得多.

using Regex is much simpler.

    var str = '.abc'
    var result = !!str.match(/^[.,:!?]/)

    console.log(result)

• /表示正则表达式的开始/结束

  • / indicates start/end of Regular expression

    ^的意思是开始于"

    []表示字符集".它将匹配[和]

    [] means 'character set'. it will match any characters between [ and ]

    此外，该应用程序对于学习正则表达式非常有用！ http://regexr.com/

    Additionally, this app is quite good to learn Regex! http://regexr.com/

    祝您有美好的一天！ :D

    Have a nice day! :D