<tr id="tr1"><td><span>张三</span><input></input></td><td><button class="exit" onclick='$("#tr1 td span").css("display","none");$("#tr1 td input").css("display","block");'>编辑</button><button class="quit" style="display:none">取消</button>

前端思路就这样，我手机不好码字，能看懂最好