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Js Implementation of the sliding effect of sharing to Page scrolling

Source: Internet
Author: User
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Js Implementation of the sliding effect of sharing to Page scrolling

The page scroll up and down, and the shared module slides.

Key points:

The Code is as follows:

Var scrtop upload document.doc umentElement. scrollTop | document. body. scrollTop;
Var height = document.doc umentElement. clientHeight | document. body. clientHeight;
Var top = scrtop + (height-jb51.offsetHeight)/2;
Top = parseInt (top );


Obtain the vertical center position of the page

Code:

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<! DOCTYPE html>

<Html>

<Head>

<Meta charset = "gb2312"/>

<Title> untitled document </title>

<Style>

Body {margin: 0; padding: 0; font: 12px/1.5 arial; height: 2000px ;}

# Jb51 {width: 100px; height: 200px; line-height: 200px;

Text-align: center; border: 1 p solid # ccc;

Background: # f5f5f5; position: absolute; left:-100px; top: 0 ;}

# Jb51_tit {position: absolute; right:-20px; top: 60px;

Width: 20px; height: 60px; padding: 10px 0;

Background: # 06c; text-align: center;

Line-height: 18px; color: # fff ;}

</Style>

<Script>

Window. onload = function (){

Var jb51 = document. getElementById ("jb51 ");

Jb51.onmouseover = function (){

Startrun (jb51, 0, "left ")

}

Jb51.onmouseout = function (){

Startrun (jb51,-100, "left ")

}

Window. onscroll = window. onresize = function (){

Var scrtop=document.doc umentElement. scrollTop | document. body. scrollTop;

Var height=document.doc umentElement. clientHeight | document. body. clientHeight;

Var top = scrtop + (height-jb51.offsetHeight)/2;

Top = parseInt (top );

Startrun (jb51, top, "top ")

}

}

Var timer = null

Function startrun (obj, target, direction ){

ClearInterval (timer );

Timer = setInterval (function (){

Var speed = 0;

If (direction = "left "){

Speed = (target-obj.offsetLeft)/8;

Speed = speed> 0? Math. ceil (speed): Math. floor (speed );

If (obj. offsetLeft = target ){

ClearInterval (timer );

} Else {

Obj. style. left = obj. offsetLeft + speed + "px ";

}

}

If (direction = "top "){

Speed = (target-obj.offsetTop)/8;

Speed = speed> 0? Math. ceil (speed): Math. floor (speed );

If (obj. offsetTop = target ){

ClearInterval (timer );

} Else {

Obj. style. top = obj. offsetTop + speed + "px ";

}

Document. title = obj. offsetTop + ',' + target + ',' + speed;

}

}, 30)

}

</Script>

</Head>

<Body>

<Div id = "jb51">

Shared content

<Span id = "jb51_tit"> share to </span>

</Div>

</Body>

</Html>

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