实现一个跨浏览器事件工具

[Sunny]

实现一个跨浏览器事件工具

[fencer]

var eventUtil = {
  addHandler: function (element, type, handler) {
    if (element.addEventListener) {
      element.addEventListener(type, handler, false);
    } else if (element.attachEvent) {
      element.attachEvent('on' + type, handler);
    } else {
      element['on' + type] = handler;
    }
  },

  removeHandler: function (element, type, handler) {
    if (element.removeEventListener) {
      element.removeEventListener(type, handler, false);
    } else if (element.detachEvent) {
      element.detachEvent('on' + type, handler);
    } else {
      element['on' + type] = null;
    }
  },

  getEvent: function(event) {
    return event ? event : window.event;
  },

  getTarget: function(event) {
    return event.target || event.srcElement;
  },

  preventDefault: function(event) {
    if (event.preventDefault) {
      event.preventDefault();
    } else {
      event.returnValue = false;
    }
  },

  stopPropagation: function(event) {
    if (event.stopPropagation) {
      event.stopPropagation();
    } else {
      event.cancelBubble = true;
    }
  }
};