相当于 Python 的 rsplit 的 JavaScript

Question

str.rsplit([sep[, maxsplit]])

Return alist of the words in the string, usingsep as the delimiter string. Ifmaxsplit is given, at most maxsplitsplits are done, the rightmost ones.If sep is not specified or None, anywhitespace string is a separator.Except for splitting from the right,rsplit() behaves like split() which isdescribed in detail below.

http://docs.python.org/library/stdtypes.html#str.rsplit

Answer 1

String.prototype.rsplit = function(sep, maxsplit) {
    var split = this.split(sep);
    return maxsplit ? [ split.slice(0, -maxsplit).join(sep) ].concat(split.slice(-maxsplit)) : split;
}

这个功能更接近 Python 版本

"blah,derp,blah,beep".rsplit(",",1)//['blah,derp,blah', 'beep']