echarts climb pit: how Line line graph setting symbol: none Label After missing?

I met a weird problem with echarts.

 

This is a line chart.

Actually, this graph is a digital display.

Series: [ 
        { 
            name: 'search engine' , 
            type: 'Line' , 
            Stack: 'total' , 
            label: { 
                Normal: { 
                    Show: to true , 
                    position: 'Top' 
                } 
            }, 
            AreaStyle: {Normal: {}} , 
            Data: [ 820., 932, 901, 934, 1290, 1330., 1320 is ] 
        } 
    ]

 

 

When I set the symbol: After 'none', the numbers on the line chart was gone?

Series: [ 
        { 
            name: 'search engine' , 
            type: 'Line' , 
            Stack: 'total' , 
            label: { 
                Normal: { 
                    Show: to true , 
                    position: 'Top' 
                } 
            }, 
            Symbol: 'none' , 
            AreaStyle: Normal {: {}}, 
            Data: [ 820., 932, 901, 934, 1290, 1330., 1320 is ] 
        } 
    ]

 

 

It may be a bug.

Later, we use other methods to bypass this problem.

Series: [ 
        { 
            name: 'search engine' , 
            type: 'Line' , 
            Stack: 'total' , 
            label: { 
                Normal: { 
                    Show: to true , 
                    position: 'Top' 
                } 
            }, 
            Symbol: 'Circle' , 
            SymbolSize: . 1 , 
            hoverAnimation: to false , 
            AreaStyle: {Normal: {}}, 
            Data: [ 820., 932, 901, 934, 1290, 1330., 1320 is ]
        }
    ]