echarts折线图tooltip从左到右显示

要实现echarts折线图tooltip从左到右显示，可以通过设置tooltip的axisPointer属性为'line'，并且在formatter中将params参数的seriesIndex设置为0。具体的配置如下：

tooltip: {
trigger: 'axis',
axisPointer: {
type: 'line'
},
formatter: function(params) {
var seriesIndex = 0; // 设置seriesIndex为0
var seriesName = params[seriesIndex].seriesName;
var dataName = params[seriesIndex].name;
var value = params[seriesIndex].value;
return seriesName + '<br/>' + dataName + '<br/>' + '数值: ' + value;
}
}

这样设置后，tooltip就会从左到右显示，并且显示的内容是每个数据点的系列名称、数据项名称和数值。注意，params参数中的seriesIndex表示当前数据点所属的系列索引，可以根据需要进行调整。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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