ie8下画柱状图，x、y坐标轴不显示，显示label标签会报参数错误

General Questions

Issue Type

[ ] I have a question to ask about how to use ECharts to ...；我想提问如何使用 ECharts 实现某功能
[x] I have a bug to report；我想要报 bug
[ ] I have a feature to request, e.g.: I'd like a new feature that ...；我需要一个新功能
[ ] I have a feature to enhance, e.g.: The current feature should be improved in the way that ...；我希望改进某个功能
[ ] There's something wrong with the documents；文档有些问题
[ ] Others, or I'm not sure which issue types to choose here；其他，或我不知道应该选什么类型

Issue Details

echarts 4.2.1在ie8下画柱状图，x、y坐标轴不显示，显示label标签会报参数错误

Expected Behavior

兼容ie8

Current Behavior

echarts 4.2.1在ie8下画柱状图，x、y坐标轴不显示，显示label标签会报参数错误

Online Example

option = { xAxis: [ { type: 'category', data: ['2012', '2013', '2014', '2015', '2016', '2017', '2018'] } ], yAxis: { type: 'value' }, series: [ { name: '>=', type: 'bar', label: { show: true }, stack:'area0', data: [320, 332, 301, 334, 390, 390, 390] }, { name: '<=', type: 'bar', label: { show: true }, stack:'area0', data: [220, 182, 191, 234, 290, 1, 14] } ] }

Topics

Anything Else We Need to Know

已经引用了兼容ie8的echarts，但在ie8下标轴、label标签不显示，把option中的label属性删除后，能显示柱状图

Environment

ECharts version；ECharts 版本: {4.2.1}
[x] It happens only on certain browsers or operating systems. 对于特定浏览器或操作系统才会出现的问题，请提供相应环境信息：{ie8}

apache / echarts