script:

var EventUtil = { getEvent: function (event) { return event || window.event; }, getTarget: function (event) { return event.target || event.srcElement; }, // 返回注册成功的监听器，IE中需要使用返回值来移除监听器 on: function (elem, type, handler) { if (elem.addEventListener) { elem.addEventListener(type, handler, false); return handler; } else if (elem.attachEvent) { function wrapper(event) { return handler.call(elem, event); }; elem.attachEvent('on' + type, wrapper); return wrapper; } }, off: function (elem, type, handler) { if (elem.removeEventListener) { elem.removeEventListener(type, handler, false); } else if (elem.detachEvent) { elem.detachEvent('on' + type, handler); } }, preventDefault: function (event) { if (event.preventDefault) { event.preventDefault(); } else if ('returnValue' in event) { event.returnValue = false; } }, stopPropagation: function (event) { if (event.stopPropagation) { event.stopPropagation(); } else if ('cancelBubble' in event) { event.cancelBubble = true; } } }; var DOMUtil = { text: function (elem) { if ('textContent' in elem) { return elem.textContent; } else if ('innerText' in elem) { return elem.innerText; } }, prop: function (elem, propName) { return elem.getAttribute(propName); } }; var nav = document.getElementById('nav'); EventUtil.on(nav, 'click', function (event) { var event = EventUtil.getEvent(event); var target = EventUtil.getTarget(event); var children = this.children; var i, len; var anchor; var obj = {}; for (i = 0, len = children.length; i < len; ++i) { if (children[i] === target) { obj.index = i + 1; anchor = target.getElementsByTagName('a')[0]; obj.name = DOMUtil.text(anchor); obj.link = DOMUtil.prop(anchor, 'href'); } } alert('index: ' + obj.index + ' name: ' + obj.name + ' link: ' + obj.link); }); 有一个大数组,var a = ['1', '2', '3', ...];a的长度是100,内容填充随机整数的字符串.请先构造此数组a,然后设计一个算法将其内容去重 /** * 数组去重 **/ function normalize(arr) { if (arr && Array.isArray(arr)) { var i, len, map = {}; for (i = arr.length; i >= 0; --i) { if (arr[i] in map) { arr.splice(i, 1); } else { map[arr[i]] = true; } } } return arr; } /** * 用100个随机整数对应的字符串填充数组。 **/ function fillArray(arr, start, end) { start = start == undefined ? 1 : start; end = end == undefined ? 100 : end; if (end <= start) { end = start + 100; } var width = end - start; var i; for (i = 100; i >= 1; --i) { arr.push('' + (Math.floor(Math.random() * width) + start)); } return arr; } var input = []; fillArray(input, 1, 100); input.sort(function (a, b) { return a - b; }); console.log(input); normalize(input); console.log(input);