document.getElementById的简写方式(获取id对象的简略写法)

function $(id){document.getElementById(id)}

function $()
{
var elements = new Array();
for (var i = 0; i < arguments.length; i++)
{
var element = arguments[i];
if (typeof element == 'string')
element = document.getElementById(element);
if (arguments.length == 1)
return element;
elements.push(element);
}
return elements;
}

function $(objectId) {
if(document.getElementById && document.getElementById(objectId)) {
return document.getElementById(objectId);// W3C DOM
} else if (document.all && document.all(objectId)) {
return document.all(objectId);// MSIE 4 DOM
} else if (document.layers && document.layers[objectId]) {
return document.layers[objectId];// NN 4 DOM.. note: this won't find nested layers
} else {
return false;
}
}