Function add

src/modules/jquery.js:8958–8968

(key, valueOrFunction)

    var prefix,
      s = [],
      add = function (key, valueOrFunction) {
        // If value is a function, invoke it and use its return value
        var value = isFunction(valueOrFunction)
          ? valueOrFunction()
          : valueOrFunction;

        s[s.length] =
          encodeURIComponent(key) +
          '=' +
          encodeURIComponent(value == null ? '' : value);
      };

    if (a == null) {
      return '';