我想在基于优惠券的背景图动态生成带文字的优惠券，有什么轮子可以使用吗？或者有其他什么思路，比如不在后台在前台处理？
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Probably, html5 Canvas can complete the functions you need in just a few sentences.
Canvas
Reference: http://www.html5party.com/534.html
Do you mean adding watermark?
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Probably, html5
Canvascan complete the functions you need in just a few sentences.Reference: http://www.html5party.com/534.html
Do you mean adding watermark?