JavaScript trim 实现去除字符串首尾指定字符的简单方法

String.prototype.trim = function (char, type) {
  if (char) {
    if (type == 'left') {
      return this.replace(new RegExp('^\'+char+'+', 'g'), '');
    } else if (type == 'right') {
      return this.replace(new RegExp('\'+char+'+$', 'g'), '');
    }
    return this.replace(new RegExp('^\'+char+'+|\'+char+'+$', 'g'), '');
  }
  return this.replace(/^s+|s+$/g, '');
};

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