设置dom节点属性的代码优化

需求：某dom节点在正常情况下，有设置其transition-duration为1s，在mousemove时候，要去掉其transition-duration设置的时间，在mouseup时候，恢复其transition-duration时间为1s。

考虑到兼容性，故设置的属性相关属性有：

　　transition-duration

　　-moz-transition-duration

　　-webkit-transition-duration

　　-o-transition-duration

最初代码逻辑：

switch(evt.type) {
                case "mousedown":
                    //XXXX
                    break;

                case "mousemove":
                    dom1.setStyle('transition-duration', '0s');
                    dom1.setStyle('-moz-transition-duration', '0s');
                    dom1.setStyle('-webkit-transition-duration', '0s');
                    dom1.setStyle('-o-transition-duration', '0s');

                    dom2.setStyle('transition-duration', '0s');
                    dom2.setStyle('-moz-transition-duration', '0s');
                    dom2.setStyle('-webkit-transition-duration', '0s');
                    dom2.setStyle('-o-transition-duration', '0s');
                    //XXXX
                    break;

                case "mouseup":
                    dom1.setStyle('transition-duration', '1s');
                    dom1.setStyle('-moz-transition-duration', '1s');
                    dom1.setStyle('-webkit-transition-duration', '1s');
                    dom1.setStyle('-o-transition-duration', '0s');

                    dom2.setStyle('transition-duration', '1s');
                    dom2.setStyle('-moz-transition-duration', '1s');
                    dom2.setStyle('-webkit-transition-duration', '1s');
                    dom2.setStyle('-o-transition-duration', '1s');
                    //XXXX
                break;   
} 

明显看到上述代码特别冗余，故抽出一个函数来干这些事情

setTransitionDuration: function(element, seconds) {
            if (!element) {
                return;
            }
            seconds = (seconds ? seconds : 0) + 's';

            element.setStyle('transition-duration', seconds);
            element.setStyle('-moz-transition-duration', seconds);
            element.setStyle('-webkit-transition-duration', seconds);
            element.setStyle('-o-transition-duration', seconds);
}

//则上述代码可直接调用：
case "mousemove":
    this.setTransitionDuration(dom1, 0);
    this.setTransitionDuration(dom2, 0);
    break;
case "mouseup":
    this.setTransitionDuration(dom1, 1);
    this.setTransitionDuration(dom2, 1);
    break;

相对于第一种方案，明显好很多了，再继续优化，将设置的属性写在一个class中，然后直接addClass/removeClass即可，这样，样式的代码放置于css文件中，js代码关注与自己的逻辑，更加清晰

//css样式代码
.transition-duration-stop {
  transition-duration: 0s;
  -moz-transition-duration: 0s;
  -webkit-transition-duration: 0s;
  -o-transition-duration: 0s;
}

//js代码
case "mousemove":
      dom1.addClass('transition-duration-stop');
      dom2.addClass('transition-duration-stop');
      break;
case 'mouseup':
      dom1.removeClass('transition-duration-stop');
      dom2.removeClass('transition-duration-stop');
      break;

大功告成