跨浏览器事件处理

  var but = document.getElementById('but');
  function view() { alert("value"); }

    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;
//在JS中[]是可以替换.的
        }
        },
        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; 
        }
        }
    }
eventUtil.addHandler(but, 'click', view); 
    <input type="button" id="but" value="Hello"/>