在背景为纯色的情况下,能够用色调来代替Alpha,而色调虽然是特效,但是他实际上只是颜色的复合,结果让文本显示单一颜色,调用-In the background for the pure color, can coloring attune instead of Alpha, and tonal though is the special effects, but he is actually the color composite, the result let text display a