源代码ASP.NET AJAX可用供您参考，因此您可以选择它并将要继续使用的部分包含在单独的JS文件中。或者，你可以将它们移植到jQuery。

The source code for ASP.NET AJAX is available for your reference, so you can pick through it and include the parts you want to continue using into a separate JS file. Or, you can port them to jQuery.

这是格式函数...

String.format = function() {
  var s = arguments[0];
  for (var i = 0; i < arguments.length - 1; i++) {       
    var reg = new RegExp("\\{" + i + "\\}", "gm");             
    s = s.replace(reg, arguments[i + 1]);
  }

  return s;
}

这里是endsWith和startsWith原型函数......

And here are the endsWith and startsWith prototype functions...

String.prototype.endsWith = function (suffix) {
  return (this.substr(this.length - suffix.length) === suffix);
}

String.prototype.startsWith = function(prefix) {
  return (this.substr(0, prefix.length) === prefix);
}