canvas文本行间距

canvas文本行间距可以通过设置StaticLayout或fabric.Text的spacingmult属性来实现。在StaticLayout中，spacingmult是行间距的倍数，通常情况下填1即可。在fabric.Text中，可以通过设置lineHeight属性来调整行间距。<em>1</em><em>2</em><em>3</em>
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