很高兴回答这个问题，我有小妙招请看视频。

{!-- PGC_VIDEO:{"thumb_height": 720, "vposter": "https://p3-sign.toutiaoimg.com/mosaic-legacy/2edd400068903847bb5d0~noop.image?x-expires=1976269964&x-signature=8Y5YNTzWPGAN2fCQPu0e%2Bjw%2BF%2Bc%3D", "thumb_width": 1280, "vid": "v02016e90000boa271qiv574kflpgis0", "vu": "v02016e90000boa271qiv574kflpgis0", "duration": 78.06, "thumb_url": "2edd400068903847bb5d0", "thumb_uri": "2edd400068903847bb5d0", "video_size": {"high": {"duration": 78.06, "h": 720, "w": 1280}, "ultra": {"duration": 78.06, "h": 720, "w": 1280}, "normal": {"duration": 78.06, "h": 720, "w": 1280}}} --}