JQuery实现方法，简单示例

function $() {

var elements = new Array();

for (var i = 0; i < arguments.length; i++)

{

var element = arguments[i];

 if (typeof element == 'string')

{

if (document.getElementById)

{

element = document.getElementById(element);

}

else if (document.all)

{

element = document.all[element];

}

}

elements.push(element);

}

if (arguments.length == 1 && elements.length > 0)

{

return elements[0];

}

else

{

return elements;

}

}

调用：

function doing()

{

var logo = $("logo");

}