remove () parameter list elements, if in the list, delete, not the error
Such as:
pop () The default list is deleted when the last element with no parameters and returns the element, the element when the parameter list of parameters index value
Without parameters:
The following standard parameters:
Del be back with the name list, with the list element, list name directly with releasing the name and relationship reference list, with the list of elements to delete the corresponding list element
To distinguish between the two is to delete the following
Just removes the first element
Dereference directly