Several extensions and shorthand _javascript techniques for obtaining DOM objects

Referring to the idea of the getelementsbyclassname in Prototype.js, we extend several methods of acquiring objects that can be used frequently in deom operations, which makes it more convenient and more accurate to use the object of acquiring objects:
Document.getelementsbyclassname = function (Classname,obox) {
Applies to getting all HTML elements within an HTML block that contain a particular classname
this.d= Obox | | Document
var children = this.d.getelementsbytagname (' * ') | | document.all;
var elements = new Array ();
for (var II = 0; II < children.length; ii++) {
var child = Children[ii];
var classnames = Child.className.split (');
for (var j = 0; J < Classnames.length; J + +) {
if (classnames[j] = = ClassName) {
Elements.push (child);
Break
}
}
}
return elements;
}

Document.getelementsbytype = function (Stypevalue,obox) {
Applies to getting all HTML elements within an HTML block that belong to a particular type, such as: Input,script,link, etc.
this.d= Obox | | Document
var children = this.d.getelementsbytagname (' * ') | | document.all;
var elements = new Array ();
for (var II = 0; II < children.length; ii++) {
if (Children[ii].type = = Stypevalue) {
Elements.push (Children[ii]);
}
}
return elements;
}

function $ () {
var elements = new Array ();
for (var II = 0; II < arguments.length; ii++) {
var element = Arguments[ii];
if (typeof element = = ' String ')
element = document.getElementById (element);
if (arguments.length = 1)
return element;
Elements.push (Element);
}
return elements;
}

$Cls = function (s,o) {
Return Document.getelementsbyclassname (S,o);
};

$Type = function (s,o) {
Return Document.getelementsbytype (S,o);
};

$Tag = function (s,o) {
This.d=o | | Document
return This.d.getelementsbytagname (s);
};

$Name = function (s) {//by Name only for the entire document and cannot be scoped
return Document.getelementsbyname (s);
};