Fuc-String-endsWith() 字符串是否是以XXX結尾

String.prototype.endsWith = function (endStr) {
  // var d = this.length - endStr.length;
  // return (d >= 0 && this.lastIndexOf(endStr) == d)
  var reg = new RegExp(endStr + "$");
  return reg.test(this);
}