22. Visitor pattern

var bindEvent = function(dom, type, fn) { if(dom.addEventListener) { dom.addEventListener(type, fn) } else if (dom. attachEvent) { dom.attachEvent(type, fn) } else { dom['on'+type] = fn } } function bindIEEvent(dom, type, fn, data) { var data = data || {} // dom.attachEvent('on'+ type, function(e) { // fn.call(dom, e, data) // }) dom.addEventListener(type, function(e){ fn.call(dom, e, data) }) } var dom = document.getElementById('box') bindIEEvent(dom, 'click', function(e, d){ console.log(e, d) dom.innerHTML += "," + d.text }, {text: 'hello', value: 1}) var Vistor = (function(){ return { push: function() { var len = arguments[0].length || 0; console.log(len, Array.prototype.slice.call(arguments,1)) var args = Array.prototype.slice.call(arguments, 1) arguments[0].length = len + arguments.length - 1 ; return Array.prototype.push.apply(arguments[0], args); }}}) (); var a = new Object; Vistor. Push (a, 1, 2, 3, 4)Copy the code