javascript怎么遍歷map

var?map?=?new?HashMap();
map.put(a,1);
map.put(b,2);
遍歷：
var?key?=?map.keySet();
for?(var?i?in?key){
?alert(map.get(key[i]));
｝
注：js?中使用map，要先導(dǎo)入一個HashMap.js文件?
沒要求，引入這個文件之后，可以直接使用hashmap了var map = {'a': 'aaaaa','b': 'bbbbb'};for(var k in map){alert(map[k]);}可以使用jquery中的each()函數(shù)。
$.each(obj,?function(i)?{
alert(obj[i]);
});??
function?也可以寫為function(key,value){
?}
key，value?就是map的key,?valuejavascript中沒有什么map

只有對象和數(shù)組可以遍歷//你的JSON對象

var o = {

foo:"bar",

arr:[1,2,3],

subo: {

foo2:"bar2"

}

//處理每一項的鍵和值的函數(shù)

function process(key,value) {

document.body.innerHTML += key + " : " + value + "
";

//遍歷函數(shù)

function traverse(o,func) {

for (i in o) {

func.apply(this,[i,o[i]]);

if (typeof(o[i])=="object") {

//遞歸

traverse(o[i],func);

}

//現(xiàn)在開始遍歷

traverse(o, process);

jsp頁面如何對map集合遍歷

MapAction.java

Java代碼

package com.zx.demo.action;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import com.opensymphony.xwork2.ActionSupport;

import com.zx.demo.model.Product;

import com.zx.demo.model.Student;

public class MapAction extends ActionSupport

private Map map;

private Map studentMap;

private Map arrayMap;

private Map > listMap;

public String testMap()

{

map=new HashMap ();

map.put("1", "one");

map.put("2", "two");

studentMap=new HashMap ();

studentMap.put("student1",new Student(new Long(1),"20034140201","張三1","男",25));

studentMap.put("student2",new Student(new Long(2),"20034140202","張三2","女",26));

studentMap.put("student3",new Student(new Long(3),"20034140202","張三3","男",27));

arrayMap=new HashMap ();

arrayMap.put("arr1", new String[]{"1","2003401","leejie","male","20"});

arrayMap.put("arr2", new String[]{"2","2003402","huanglie","male","25"});

arrayMap.put("arr3", new String[]{"3","2003403","lixiaoning","male","21"});

listMap=new HashMap >();

List list1=new ArrayList ();

list1.add(new Student(new Long(1),"20034140201","張三1","男",25));

list1.add(new Student(new Long(2),"20034140202","張三2","男",25));

list1.add(new Student(new Long(3),"20034140203","張三3","男",25));

listMap.put("class1", list1);

List list2=new ArrayList ();

list2.add(new Student(new Long(1),"20034140301","李四1","男",20));

list2.add(new Student(new Long(2),"20034140302","李四2","男",21));

list2.add(new Student(new Long(3),"20034140303","李四3","男",22));

list2.add(new Student(new Long(4),"20034140304","李四4","男",23));

listMap.put("class2", list2);

return SUCCESS;

}

public Map getMap() {

return map;

}

public void setMap(Map map) {

this.map = map;

}

public Map getStudentMap() {

return studentMap;

}

public void setStudentMap(Map studentMap) {

this.studentMap = studentMap;

}

public Map getArrayMap() {

return arrayMap;

}

public void setArrayMap(Map arrayMap) {

this.arrayMap = arrayMap;

}

public Map > getListMap() {

return listMap;

}

public void setListMap(Map > listMap) {

this.listMap = listMap;

}

2.testMap.jsp

Java代碼

1.map中的value為String字符串

key:

value:

******************************************

2.map中的value為Student對象

key=value	ID	num	name	sex	age

3.map中的value為String數(shù)組

key=value	ID	num	name	sex	age

4.map中的value為list集合

class	ID	num	name	sex	age

${item.key}中的key的值是你定義的一個班級Class對象，它不是可遍歷的對象。

${var.name}

${item.key.name}文章來源地址http://www.zghlxwxcb.cn/news/detail-426233.html