Does the beginPath and the closePath have to be included for this line to draw or for all of the graphics. I have the new HTML 5 Canvas book but this I was not completely certain of. I commented out the two lines and the line still displayed. What is the significance of these two lines.Does the beginPath and the closePath have to be
阅读背景：
我必须拥有content.beginPath（）和content.closePath（）吗？
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