2019.3.23---经验库 json前端接收数据

后端代码

    @ResponseBody
    @RequestMapping(value = "/test",produces = "application/json;charset=utf-8",method = RequestMethod.POST)
    public String eEharts(){

        PageData pd = new PageData();
        List<PageData> list =null;
        try {

            list = userService.charts();

        } catch (Exception e) {
            e.printStackTrace();
        }
		
		//JSONArray.fromObject(list)或者//JSONObject.fromObject(list)把list集合 转换成json格式 把list集合 转换成json格式 
        return R.doOut(JSONArray.fromObject(list)); 
    }
}

前端代码

</script>

    <h3>异步加载图</h3>
    <div id="main3" STYLE="width: 600px;height: 400px"></div>
    <script>
        var myChart = echarts.init(document.getElementById("main3"))
        myChart.setOption ({
            xAxis: {
                type: 'category',
                data: []
            },
            yAxis: {
                type: 'value'
            },
            series: [{
                data: [],
                type: 'line'
            }]
        });

        
		var n =[]; //定义两个数组
		var s =[];

        $.ajax({
            url:'<%=basePath%>charts/test',
            method:'POST',
            data:'',
            success:function(data){

                var newData = JSON.stringify(data);  //把前端传过来的数据转换为json字符串
                var jsda = eval('('+newData+')');    // eval 检验json里的每一个字符串
                
                for(var a in jsda){    //for循环遍历json里的数据 
                    n.push(jsda[a].name); //把遍历的数据存到数组里
                    s.push(jsda[a].shuliang)
                }
                var option = {
                    xAxis: {
                        type: 'category',
                        data:n
                    },
                    yAxis: {
                        type: 'value'
                    },
                    series: [{
                        data: s,
                        type: 'line'
                    }]
                };
                myChart.setOption(option);
            }
        })
    </script>