返回Map数据

1. 后端接口返回数据格式

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

2. 前端js处理取值

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

### 返回list数组数据
1. 后端接口返回数据

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

2. 前端js取值

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

 
### string转map的方法
js中string转map的方法
例如：

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

### 数组循环

parentData数据格式

```json
{
    "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"
        }
    ]

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:''
				}
		  })
	  }}
	)
						

向数组结尾添加元素

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

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

定义数组

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 }]