新版echarts无法使用百分比设置xy轴label值大小（The echarts histogram cannot set the size of the label value using a percentage）

[qqchenhai]

What problem does this feature solve?

echarts适应不同分辨率下的图形展示

What does the proposed API look like?

上一版本是支持百分比字符串定义label标签值大小的

[echarts-bot]

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[echarts-bot]

@qqchenhai Please provide a demo for the issue either with https://codepen.io/Ovilia/pen/dyYWXWM , https://www.makeapie.com/editor.html or https://codesandbox.io/s/mystifying-bash-2uthz.

[qqchenhai]

option = {
    xAxis: {
        type: 'category',
        data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'],
        axisLabel:{
            fontSize:'200%',
        }
    },
    yAxis: {
        type: 'value',
        axisLabel:{
            fontSize:'80%',
        }
    },
    series: [{
        data: [820, 932, 901, 934, 1290, 1330, 1320],
        type: 'line'
    }]
};

[qqchenhai]

(Mainly is to set the font size in version 5.0 percentage cannot identify effective, and can be effective in the old version, scope of application is for different resolution of the display can be more friendly, because when setting specific value, under some screen resolution, the font size may be too big, but using percentage can be more friendly display text coordinate system)主要是设置字体大小在5.0版本中设置百分比无法识别生效，而在旧版本中是可以生效的，应用范围就是针对不同分辨率下的显示器可以更加友好，因为设置具体值时，在有的显示器分辨率下，字体大小可能过大，而使用百分比可以更加友好的显示坐标轴文本