jQuery链式调用

 <script>
          var arr = function(){
            return new arr.prototype.init();
        }
        arr.prototype.init = function(){//介质
            return this;
        }
        arr.prototype.ded1 = function(){
            console.log(1);
            return this;
        }
        arr.prototype.ded2 = function(){
            console.log(2);
            return this;
        }
        
        arr.prototype.init.prototype = arr.prototype;
        arr().ded1().ded2();
  </script>

arr.prototype.init.prototype = arr.prototype;关键步骤