function stopPropagation(e) {      e = e || window.event;      if(e.stopPropagation) { //W3C阻止冒泡方法          e.stopPropagation();      } else {          e.cancelBubble = true; //IE阻止冒泡方法      }  }

box2.οnmοuseοver=function(e){          console.log(22);         stopPropagation(e);  }