Web automation: 5.2selenium mouse operation principle: ActionChains-delayed call

In the mouse operation, the ActionChains class provided by selenium is used.
Here is a brief introduction to the execution principle of ActionChains: when the method of ActionChains is called, it will not be executed immediately, but will be stored in a list in order. When the perform() method is called, the methods stored in the list are executed sequentially.

1. ActionChains class code view

1. In the code, hold down the ctrl key and click ActionChains to open the corresponding code file
2. Open the Structure, you can see all the methods in the ActionChains class in the structure
   

2. The principle of delayed call

1) Initialize an empty list actions in the __innit() function;
2) Add the name of the operation method to the actions list in each operation method;
3) For loop the actions list in the perform method, call the function action(
) The reason to add .perform(): action.double_click(el).perform()

3. Practice

Write a simple code here to further explain how this delayed call is implemented

# 定义两个操作方法
def click():
    print("单击")
    
def double_click():
    print("双击")

# 第一步：定义一个空列表，用来存方法名
actions = []

# 第二步：将操作方法添加到 actions列表
def add(func):
    actions.append(func)

# 第三步：在 perform 方法内 for循环actions列表，依次执行存放的方法
def perform():
    for action in actions:
        action()

# 第四步：只有调用 perform（）时，才会真正去执行被添加进来的方法
add(click)
add(double_click)
print(actions)
perform()

Output result:

[<function click at 0x000001BDAE822F70>, <function double_click at 0x000001BDAE824430>]
单击
双击