echarts中tooltips，鼠标移入提示框出界问题

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1.confine:true

2.tooltip: {
            position: function (pos, params, el, elRect, size) {
                var obj = {top: 10};
                obj[['left', 'right'][+(pos[0] < size.viewSize[0] / 2)]] = 30;
                return obj;
            }
        },

https://www.echartsjs.com/gallery/editor.html?c=doc-example/candlestick-axisPointer