# :-: 3.1 理解图层和图层叠加顺序-1 ***** ```[video] src: >- http://sp.cqxymwlkjyxgs.com/58d95e95vodtranscq1256398144/3e1c232e5285890814317178390/v.f100800.mp4 poster: >- http://sp.cqxymwlkjyxgs.com/58d95e95vodtranscq1256398144/3e1c232e5285890814317178390/coverBySnapshot_10_0.jpg ```