Front-end js calls interface to convert Map array data

Return Map data

1. Backend interface returns data format

{
    "code": 1,
    "msg": "操作成功!",
    "count": 0,
    "data": {"数量":0}
}

2. Front-end js processing value

var parentData = JSON.parse(JSON.stringify(res.data));
this.volume = parentData.容量总数;

return list array data

1. Backend interface returns data

{
    "code": 1,
    "msg": "操作成功!",
    "count": 0,
    "data": [
        {
            "数量": 132779
        }
    ]
}

2. Front-end js value

var list = eval(res.data);
this.num = list[0].数量;

String to map method

1. The method of string to map (object or array object) in js is for example:

var  r = "{'msg':'你好'}" ;
var map = eval("("+r+")"); //r为String类型的数据
var xx = map.msg;  //此时 xx 的值为 你好

array loop

1. parentData data format

{
    "code": 1,
    "msg": "操作成功!",
    "count": 0,
    "data": [
        {
            "morder": 1,
            "img": "el-icon-adm-form",
            "name": "检测分析",
            "childList": [
                {
                    "morder": 1,
                    "name": "检测分析体系",
                    "pid": 8,
                    "id": 9,
                    "url": "/target/target"
                }
            ],
            "pid": 0,
            "id": 8,
            "url": "/target"
        },
        {
            "morder": 2,
            "img": "el-icon-adm-project",
            "name": "系统设置",
            "pid": 0,
            "id": 1,
            "url": "/system"
        }
    ]

2. js page value

var data1= parentData.map((item)=>{
		return{
			path:item.url!=null?item.url:'',
			title:item.name!=null?item.name:'',
			icon:item.img!=null?item.img:'',
			children:item.childList.map((itemchild)=>{
				return{
					path:itemchild.url!=null?itemchild.url:'',
					title:itemchild.name!=null?itemchild.name:''
				}
		  })
	  }}
	)

define array

var value1 = [];
var map1 = {name:item.单位,value:item.已采集覆盖且监测台区数}
value1.push(map1);

//返回数据
[{"name": "白银","value": 0 }]

add an element to the end of the array

var arr = [1,2,3,4,5];
var arr2 = [];

arr.push(6);
arr[arr.length] = 6;
arr2 = arr.concat([6]);

Get data JSON.parse() conversion

1. JSON.parse() is to parse a json object from a string

	//定义一个字符串
	var data='{"name":"数据JSON转换"}'
	//解析对象​
	​JSON.parse(data)
	结果是：​name:"数据JSON转换"

Get data JSON.stringify() conversion

2. JSON.stringify() parses a string from an object

var data={name:'数据JSON转换'}
JSON.stringify(data)
结果是：'{"name":"数据JSON转换"}'

get data eval transformation

1. The eval() function evaluates a string and executes the JavaScript code within it.

var value = eval("2+2");
//计算值等于4

2. You can use eval to convert the returned data to a list array

if (res.code == 1) {
   if (res.data != null) {
	var list = eval(res.data);
	this.total = list[0].总数;
   } else {
	 this.total = 0;
   }
 }

Back-end transfer array list front-end value display

Backend value res.data

	[{"用户数量":21,"注册数量":2}]

Front-end value display

//定义数据存储
var numsArr = {};
//获取数据转换
var list = eval(res.data);
//数据赋值
this.numsArr = list[0];
//vue页面展示
{{numsArr.用户数量}}
{{numsArr.注册数量}}

Remove the double quotes "" from the value obtained in the background

   var reg = new RegExp('"',"g");
   this.name = name.replace(reg, "")

Front-end value JSON string received in the background

Vue front-end pass value JSON

var testStr =[{"id":4,"name":"用户管理"}];
this.axios.post('/test/api/insert?testStr='+JSON.stringify(addlistTemp),{headers: {'Content-Type': 'application/json;charset=UTF-8'},}).then(res => {
if (res.code == 1) {
  this.$message.success("操作成功");
}
}).catch(error => {
	console.log(error);
});	  

background conversion

@RequestMapping(value = "insert")
public BasePageData insert(HttpServletRequest request,String testStr) {
	BasePageData data = new BasePageData();
	try {
		List<User> userList = JsonUtils.parseArray(testStr,User.class);
		//往数据库中增加数据...
		data.setCode(WebResponseCode.SUCCESS);
		data.setMsg("操作成功!");
		data.setData(userList);
	}catch (Exception e){
		e.printStackTrace();
		data.setCode(WebResponseCode.FAIL);
		data.setMsg("操作失败!");
	}
	return data;
}

//注：JsonUtils方法
public static final <T> List<T> parseArray(final String json, final Class<T> clazz) {
		return JSON.parseArray(json, clazz);
}

Traversing Map objects in js

console.log(jsonData);//火狐控制台打印输出： Object { fileNumber="文件编号", fileName="文件名称"}
for(var key in jsonData)
    console.log("属性：" + key + ",值："+ jsonData[key]);
}
 
打印输出：
    属性：fileNumber, 值：文件编号
    属性：fileName, 值：文件名称

html loop List<Map<String, Object>> array

	List<Map<String, Object>> peopleTypeCountList = new ArrayList<>();
	peopleCensusMap.peopleTypeCountList = [{唐老鸭=1}, {米老鼠=0}, {紫叶草=0}, {绿茶=0}]

<li th:each="peopleTypeMap:${peopleCensusMap.peopleTypeCountList}">
	<div th:each="item,peopleType:${peopleTypeMap}">
		<span class="yrpic"></span><p th:text="${peopleType.current.value}">0</p><p th:text="${peopleType.current.key}">残疾人</p>
	</div>
</li>

js get the current time

// var date = new Date()
// var startdate;
// var year = date.getFullYear();
// var month = date.getMonth() + 1;
// if (month < 10) {
//     startdate = year + '0' + month;
// } else {
//     startdate = year + '' + month;
// }

{{o.name}}

{{m.name}}