前言:
如果看过了第一篇和第二篇, 相信大家会对jQuery有个初步的认识了, 对于jQuery的选择器和数组的操作都已经很熟悉了, 这一篇就单独罗列jQuery中字典的操作相关的内容.
1. 数组中添加map
var arr = []; var key = ‘Jeremy‘; var value = ‘!!!!‘ arr.push({ ‘key‘: key, ‘value‘: value, }); document.write("key: " + arr[0][‘key‘] + "<br/>value: " + arr[0][‘value‘]);输出结果：key: Jeremyvalue: !!!!2. 数组遍历输出
var arr = []; arr.push("Jeremy"); arr.push("Jimmy"); for(var i in arr) document.write(i + ": " + arr[i] + "</br>");输出结果：0: Jeremy1: Jimmy3. 类似字典（map)遍历
var dict = []; //or dict = new Array() dict["Jeremy"] = 20; dict["Jimmy"] = 30; for(var key in dict) document.write(key + ": " + dict[key] + "</br>"); 输出结果：Jeremy: 20Jimmy: 30
4. 字典声明时赋值
var dict = { "Jeremy" : 20, "Jimmy" : 30 }; for(var key in dict) document.write(key + ": " + dict[key] + "</br>"); 输出结果：Jeremy: 20Jimmy: 30var dict = { "Jeremy" : ["Chinese", "Math"] , "Jimmy" : ["Art", "English"] }; var name = "Jeremy"; for(var courseIndex in dict[name]) document.write(dict[name][courseIndex] + "</br>"); 输出结果：ChineseMath
5. 字典里value为数组， 数组内为字典，
var dict = []; var courseListOfJeremy = [ {"Chinese" : 3}, {"Math": 5} ]; dict[‘Jeremy‘] = courseListOfJeremy; var courseListOfJimmy = [ {"Art": 3}, {"English": 5} ]; dict[‘Jimmy‘] = courseListOfJimmy; document.write("Jimmy‘s Course Number Of Chinese: " + dict[‘Jeremy‘][0][‘Chinese‘]);输出结果：Jimmy‘s Course Number Of Chinese: 3
小例子：用JS实现省市县三级联动
<h3> ???您的地址是：</h3><select id="Province" onchange="SelectValueChanged(‘Province‘, ‘Get_City‘)"> ???<option id="Not_data1">Province</option> ???<option id="GuangDong" value="GuangDong">GuangDong</option> ???<option id="ShanDong" value="ShanDong">ShanDong</option> ???<option id="HuNan" value="HuNan">HuNan</opetion></select><select id="City" onchange="SelectValueChanged(‘City‘, ‘Get_Country‘)"> ???<option id="Not_data2">City</option></select><select id="Country"> ???<option id="Not_data3">Country</option></select>"use strict"//初始化的数据var placeDictionary = { ???"GuangDong":{ ???????"GuangZhou":["PanYu","HuangPu","TianHe"], ???????"QingYuan":["QingCheng","YingDe","LianShan"], ???????"FoShan":["NanHai","ShunDe","SanShui"] ???}, ???"ShanDong":{ ???????"JiNan":["LiXia","ShiZhong","TianQiao"], ???????"QingDao":["ShiNan","HuangDao","JiaoZhou"] ???}, ???"HuNan":{ ???????"ChangSha":["KaiFu","YuHua","WangCheng"], ???????"ChenZhou":["BeiHu","SuXian","YongXian"] ???}};//通过province或city的变化连动function SelectValueChanged(idType, perpose) { ???var selectedValue = GetSelectedId(idType); ???if(perpose == "Get_City") ???{ ???????AddCity(selectedValue); ???} ???else if(perpose == "Get_Country") ???{ ???????AddCountry(selectedValue); ???}}function GetSelectedId(id){ ???var prop = document.getElementById(id); ???var selectedValue = prop.options[prop.selectedIndex].id; ???return selectedValue;}function AddCity(provinceSelectedValue){ ???//保持联动的一致性， 当Province的index变化时都需要清空City和Country的值 ???$("#City").empty(); ???$("#City").append("<option>City</option>"); ???$("#Country").empty(); ???$("#Country").append("<option>Country</option>"); ???var cityNames = placeDictionary[provinceSelectedValue]; ???for(var city in cityNames) ???{ ???????//这里遍历的值直接是value ???????var value = "<option id=‘"+ city +"‘>" + city + "</option>"; ???????$("#City").append(value); ???}}function AddCountry(citySelectedValue) { ???//保持联动一致性，当City的index变化时需要清空Country中的值 ???$("#Country").empty(); ???$("#Country").append("<option>Country</option>"); ???var provinceSelectedId = GetSelectedId("Province"); ???//获得城市列表 ???var countries = placeDictionary[provinceSelectedId][citySelectedValue]; ???for(var index in countries) ???{ ???????//这里index获取的是id 值 ???????var value = "<option id=‘"+ countries[index] +"‘>" + countries[index] + "</option>"; ???????$("#Country").append(value); ???}}效果如下图:
英语小贴士：
I ache all over.
我浑身酸痛。
I‘m flattered.
过奖了。
I‘m mad at myself.
我生自己的气。
I‘m not myself today.
我今天心神不宁。
I‘m very/ really/ terribly/ awfully/ extremely sorry.
十分抱歉。
I‘m working on it.
我正在努力。
It can‘t be helped.
无能为力。
I can‘t seem toget to sleep.
我好像睡不着。
I don‘t feel up to that.
我觉得不能胜任那工作。
I have a runny nose.
我流鼻涕。
I have a sweet tooth.
我喜欢吃甜食。