js遍历map(js遍历map对象)

雨点打透心脏的1/2处 2023-10-11 18:48 96阅读 0赞

### javascript怎么遍历map ###

只有对象和数组可以遍历//你的JSON对象

var o = \{

foo:"bar",

arr:\[1,2,3\],

subo: \{

foo2:"bar2"

//处理每一项的键和值的函数

function process(key,value) \{

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

//遍历函数

function traverse(o,func) \{

for (i in o) \{

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

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

//递归

traverse(o\[i\],func);

//现在开始遍历

traverse(o, process);

![js遍历map(js遍历map对象)\_js遍历map(js遍历map对象)][js_map_js_map_js_map_js_map]

### jsp页面如何对map集合遍历 ###

MapAction.java

Java代码

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","张三1","男",25));

studentMap.put("student2",new Student(new Long(2),"20034140202","张三2","女",26));

studentMap.put("student3",new Student(new Long(3),"20034140202","张三3","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","张三1","男",25));

list1.add(new Student(new Long(2),"20034140202","张三2","男",25));

list1.add(new Student(new Long(3),"20034140203","张三3","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代码

struts2中的map遍历总结

**1.map中的value为String字符串**

key:

value:

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

**2.map中的value为Student对象**

<table> 
 <tbody> 
  <tr> 
   <td>key=value</td> 
   <td>ID</td> 
   <td>num</td> 
   <td>name</td> 
   <td>sex</td> 
   <td>age</td> 
  </tr> 
  <tr> 
   <td> </td> 
   <td> </td> 
   <td> </td> 
   <td> </td> 
   <td> </td> 
   <td> </td> 
  </tr> 
 </tbody> 
</table>

**3.map中的value为String数组**

**4.map中的value为list集合**

<table> 
 <tbody> 
  <tr> 
   <td>class</td> 
   <td>ID</td> 
   <td>num</td> 
   <td>name</td> 
   <td>sex</td> 
   <td>age</td> 
  </tr> 
  <tr> 
   <td> </td> 
   <td> </td> 
   <td> </td> 
   <td> </td> 
   <td> </td> 
  </tr> 
 </tbody> 
</table>

$\{item.key\}中的key的值是你定义的一个班级Class对象，它不是可遍历的对象。

$\{var.name\}

$\{item.key.name\}

[js_map_js_map_js_map_js_map]: https://img0.baidu.com/it/u=3463933583,809138225&fm=26&fmt=auto