Fastener

A fastener, comprising:

• a first assembly comprising an engaging structure;
• and
• a second assembly detachably connected to the first assembly, wherein the second assembly comprises:
• an upper housing having a first side and a second side opposite to the first side;
• a lower housing disposed at the second side of the upper housing;
• a button disposed at the first side of the upper housing and adapted to move along a first axis;
• a fixing set disposed at the second side of the upper housing and comprising a first fixing member and a second fixing member, wherein the first fixing member and the second fixing member are relatively movable along a second axis with relative to each other, the first fixing member and the second fixing member are adapted to engage with the engaging structure, and the second axis is perpendicular to the first axis;
• and
• a stopper disposed at the second side of the upper housing and connected to the button, wherein the stopper is located between the first fixing member and the second fixing member and is adapted to limit or release an engagement of the first fixing member and the second fixing member with the engaging structure;
• wherein, when the button moves relative to the upper housing along the first axis, the button drives the stopper to move to release the engagement of the first fixing member and the second fixing member with the engaging structure, and then, when the first assembly moves away from the second assembly along the first axis, the engaging structure pushes the fixing set to cause the first fixing member and the second fixing member approaching each other along the second axis, until the fixing set is separated from the engaging structure.