如果charAt等于字符列表

Question

我想在Javascript中使用以下内容

如果str.charAt(index)(在集合中){".",",","#","$",";",":"}

是的,我知道这一定很简单,但我似乎无法正确理解语法.我现在拥有的是什么

theChar = str.charAt(i);
if ((theChar === '.') || (theChar === ',') || (theChar === ... )) {
  // do stuff
}

这有效,但必须有更好的方法.

编辑:我做了这个,但不确定它是否良好:

var punc = {
    ".":true,
    ",":true,
    ";":true,
    ":":true
};

if (punc[str.charAt[index]) { ...

Answer 1

使用这些字符定义一个数组,然后只需在数组中搜索.一种方法是:

var charsToSearch = [".", ",", "#", "$", ";", ":"];
var theChar = str.charAt(i); /* Wherever str and i comes from */

if (charsToSearch.indexOf(theChar) != -1) {
    /* Code here, the char has been found. */
}