Javascript learning journey (3) _ basic knowledge

Chapter 4 Case Study: childNodes attribute of the javascript Art Museum: An array containing all the child elements of the given element node is returned.
ChildType attribute: The returned array contains all types of nodes.
NodeValue attribute: changes the value of a text node.
FirstChild and lastChild attributes: whenever and wherever you need to access the first element of the childNodes [] array, you can write it as firstChild.
Node. firstChild is equivalent to node. childNodes [0].
Likewise
Node. lastChild is equivalent to node. childNodes [node. childNodes. length-1]

Chapter 5 javascript programming principles and good habits

Reserved return route
Separating javascript
Backward compatibility

Chapter 6

Bind multiple javascript Functions to the onload event handler

Function addLoadEvent (func ){
Varoldonload = window. onload;
If (typeof window. onload! = 'Function '){
Windows. onload = func;
}
Else {
Window. onload = function (){
Oldonload ();
Func ();
}
}
}


Call Method
AddLoadEvent (method name );
AddLoadEvent (method name );