Get several extensions and abbreviations of DOM objects_javascript skills

Referring to the idea of ​​getElementsByClassName in prototype.js, several methods of obtaining objects that can be frequently used in DEOM operations have been extended, making it more convenient and accurate to obtain objects:
document.getElementsByClassName = function(className, oBox) {
//Suitable for getting all HTML elements containing a specific className within an HTML block
this.d= oBox || document;
var children = this.d.getElementsByTagName( '*') || document.all;
var elements = new Array();
for (var ii = 0; ii var child = children[ii] ;
var classNames = child.className.split(' ');
for (var j = 0; j if (classNames[j] == className) {
elements.push(child);
break;
}
}
}
return elements;
}

document.getElementsByType = function(sTypeValue ,oBox) {
//Suitable for obtaining all HTML elements belonging to a specific type within an HTML block, 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 if (children[ii].type == sTypeValue) {
elements.push(children[ii]);
}
}
return elements;
}

function $() {
var elements = new Array();
for (var ii = 0; 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 The method can only be used for the entire document and cannot be limited to its scope
return document.getElementsByName(s);
};