HTML代码：

<

div 

class

="float"

 id

="float"

>

    我是个腼腆羞涩的浮动层...

</

div

>

 

JS代码：

var

 $smartFloat 

=

 

function

(elements) {

    

var

 position 

=

 

function

(element) {

        

var

 top 

=

 element.getPosition().y, pos 

=

 element.getStyle(

"

position

"

);

        window.addEvent(

"

scroll

"

, 

function

() {

            

var

 scrolls 

=

 

this

.getScroll().y;

            

if

 (scrolls 

>

 top) {

                

if

 (window.XMLHttpRequest) {

                    element.setStyles({

                        position: 

"

fixed

"

,

                        top: 

0

                    });    

                } 

else

 {

                    element.setStyles({

                        top: scrolls

                    });    

                }

            }

else

 {

                element.setStyles({

                    position: 

"

absolute

"

,

                    top: top

                });    

            }                       

        });

    };

    

if

 ($type(elements) 

===

 

"

array

"

) {

        

return

 elements.each(

function

(items) {

            position(items);                         

        });

    } 

else

 

if

 ($type(elements) 

===

 

"

element

"

) {

        position(elements);    

    }

};

//

绑定

$smartFloat($(

"

float

"

));

转至：