应用: 快手
任务: 打开快手，去“快手小店”，进入购物车，更改商品小米手机颜色为“白色”
操作步骤:
step_id: 0
action: CLICK
step_id: 1
action: CLICK
step_id: 2
action: CLICK
step_id: 3
action: CLICK
step_id: 4
action: STOP