js利用canvas测量文字的真实宽度

function getTextWith(text, fontStyle) {
  var canvas = document.createElement('canvas')
  var context = canvas.getContext('2d')
  context.font = fontStyle || '16px' // 设置字体样式，当然，也可以在这里给一个默认值
  var dimension = context.measureText(text)
  return dimension.width
}
var textWidth = getTextWith('This is my dog!', '14px/1.6 "Microsoft Yahei"')
console.log(textWidth)

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