擷取DOM對象的幾種擴充及簡寫

參照prototype.js中getElementsByClassName的思想，擴充出幾種在DEOM操作中可經常用到的擷取對象的方法，使用擷取對象變得更方便、更精確了：
document.getElementsByClassName = function(className,oBox) {
//適用於擷取某個HTML區塊內部含有某一特定className的所有HTML元素
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) {
//適用於擷取某個HTML區塊內部同屬於某一特定type的所有HTML元素，如:input,script,link等等
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){ //通過name的方式只能針對整個document而言，不能為其限定範圍
return document.getElementsByName(s);
};