iphone手机怎么设置悬浮小球

[[{"txt": "iphone\u624b\u673a\u5982\u4f55\u8bbe\u7f6e\u60ac\u6d6e\u7403\uff1f"}], [{"txt": ["\u5de5\u5177/\u539f\u6599"]}, {"txt": "iphone\u624b\u673a"}], [{"txt": ["\u65b9\u6cd5/\u6b65\u9aa4"]}, {"txt": "\u70b9\u51fb\u8fdb\u5165\u201c\u8bbe\u7f6e\u201d\u9875\u9762"}, {"img": ["https://exp-picture.cdn.bcebos.com/5a5a00def4dca039ba872e5f58d96975f3c40d2c.m2m?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_500%2Climit_1"]}, {"txt": "\u201c\u8bbe\u7f6e\u201d\u2192\u201c\u901a\u7528\u201d"}, {"img": ["https://exp-picture.cdn.bcebos.com/125ed0ecd3d969755f5c0c2ad243040149fe092c.m2m?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_500%2Climit_1"]}, {"txt": "\u201c\u901a\u7528\u201d\u2192\u201c\u8f85\u52a9\u529f\u80fd\u201d"}, {"img": ["https://exp-picture.cdn.bcebos.com/6834ecc4ec995943b499a84d95425d6b05d1042c.m2m?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_500%2Climit_1"]}, {"txt": "\u8fdb\u5165\u201c\u8f85\u52a9\u529f\u80fd\u201d\u4e0b\u62c9\u2192\u201cAssistiveTouch\u201d"}, {"img": ["https://exp-picture.cdn.bcebos.com/58021a0148fe1e42eef3e462c2299a883813032c.m2m?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_500%2Climit_1"]}, {"txt": "\u70b9\u51fb\u8fdb\u5165\u201cAssistiveTouch\u201d\u540e\u70b9\u51fb\u5f00\u542f"}, {"img": ["https://exp-picture.cdn.bcebos.com/1f03436b04d149292c10d9a063e5eceeacbc7e2c.m2m?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_500%2Climit_1"]}]]