Split a string only the at the first n occurrences of a delimiter

As per MDN:

string.split(separator, limit);

Update:

var string = 'Split this, but not this',
    arr = string.split(' '),
    result = arr.slice(0,2);

result.push(arr.slice(2).join(' ')); // ["Split", "this,", "but not this"]

Update version 2 (one slice shorter):

var string = 'Split this, but not this',
    arr = string.split(' '),
    result = arr.splice(0,2);

result.push(arr.join(' ')); // result is ["Split", "this,", "but not this"]