vue-pdf组件打印文字全是空白框

参考：https://www.yii666.com/blog/34226.html

github地址：https://github.com/FranckFreiburger/vue-pdf/pull/130/commits/253f6186ff0676abf9277786087dda8d95dd8ea7#diff-537fb76c67921bef8ccf535dad221c0c875ae6d1077a6b16f055440d32b5421f