手机网页中的hover成效实现

function mouseout(obj) {          var className ="hover";          var _ecname = obj.className;          if (_ecname.length == 0) return;          if (_ecname == className) {           obj.className ="";return;          }    if (_ecname.match(new RegExp("(^|\s)"+ className +"(\s|$)")))           obj.className = _ecname.replace((new RegExp("(^|\s)"+ className +"(\s|$)")),"");         }      function hover(obj) {          if (!obj) return;          var className ="hover"      var _ecname = obj.className;          if (_ecname.length == 0) {           obj.className = className;return;          }          if (_ecname == className || _ecname.match(new RegExp("(^|\s)"+ className +"(\s|$)")))       return;          obj.className = _ecname +""+ className;         }