javascript怎么遍历map
varmap=newHashMap();
map.put(a,1);
map.put(b,2);
遍历:
varkey=map.keySet();
for(variinkey){
alert(map.get(key[i]));
}
注:js中使用map,要先导入一个HashMap.js文件
没要求,引入这个文件之后,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()函数。
$.each(obj,function(i){
alert(obj[i]);
});
function也可以写为function(key,value){
}
key,value就是map的key,valuejavascript中没有什么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);
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
1.map中的value为String字符串
key:
value:
******************************************
2.map中的value为Student对象
key=value | ID | num | name | sex | age |
3.map中的value为String数组
key=value | ID | num | name | sex | age |
4.map中的value为list集合
class | ID | num | name | sex | age |
${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}