例如华为荣耀x20

fontWeight用数字来标识时，在一些安卓机上会导致字体大小会有问题
const ctx = wx.createCanvasContext('myCanvas')
ctx.font = '480 20px/20px Arial'
const metrics = ctx.measureText('199.99')

而且用bold也不生效
const ctx = wx.createCanvasContext('myCanvas')
ctx.font = 'bold 20px/20px Arial'
const metrics = ctx.measureText('199.99')