当draggable属性设置为false时，不会删除事件

Question

var attachEvents =（function（）{           var events =＆＃34;点击mouseover mouseout mousedown mouseup mousemove keydown keyup dragstart dragend drag＆＃34; .split（＆＃34;＆＃34;）;           for（var i = 0; i             }）（事件[I]）;            }       }）（）;         Object.prototype.draggable =函数（f）{           this.setAttribute（＆＃34;可拖动＆＃34;中，f）;           var currentX，currentY，clickX，clickY;

         function mouseMove(e){
         e.preventDefault(); 
         if(this.getAttribute("click")=="true"){
            currentX+=e.clientX-clickX;
            currentY+=e.clientY-clickY;
            clickX+=e.clientX-clickX;
            clickY+=e.clientY-clickY;
            if(this.hasAttribute("cx")){
             this.setAttribute("cx",currentX);
             this.setAttribute("cy",currentY);   
            }
            else{
             this.setAttribute("x",currentX);
             this.setAttribute("y",currentY);
            }

             }
         };
        function mouseDown(e){
            e.preventDefault();
            this.setAttribute("click","true");
            click=true;
            clickX=e.clientX;
            clickY=e.clientY;
         };
       function mouseUp(){
            this.setAttribute("click","false");
        };
        if(this.getAttribute("draggable")=="true"){
         if(this.hasAttribute("cx")){
             currentX=Number(this.getAttribute("cx"));
             currentY=Number(this.getAttribute("cy"));
             this.mousedown(mouseDown);
             this.mouseup(mouseUp);
             this.mousemove(mouseMove);  
         }      
         else{
             currentX=Number(this.getAttribute("x"));
             currentY=Number(this.getAttribute("y"));
             this.mousedown(mouseDown);
             this.mouseup(mouseUp);
             this.mousemove(mouseMove); 
         }
      }
      else if(this.getAttribute("draggable")=="false"){
          this.unmousedown(mouseDown);
          this.unmouseup(mouseUp);
          this.unmousemove(mouseMove);
      }
  };