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Return to the top of the page for rolling and dynamic display and hiding.

Source: Internet
Author: User
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Return to the top of the page for rolling and dynamic display and hiding.

Many websites have the function of returning to the top to judge the dynamic display and hiding of rolling parameters. This function is suitable for beginners.

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<! DOCTYPE html PUBLIC "-// W3C // dtd xhtml 1.0 Transitional // EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<Html xmlns = "http://www.w3.org/1999/xhtml">

<Head>

<Meta http-equiv = "Content-Type" content = "text/html; charset = UTF-8"/>

<Title> achieve dynamic display back to the top or not </title>

<Style>

/* Return to the top */

. Back_top {width: 45px; height: 45px; background: url(back_top_new.png) 0 0; position: fixed; left: 50%; margin-left: 500px; bottom: 105px; display: none ;}

. Back_top: hover {background: url (images/back_top_new.png) 0-46px ;}

</Style>

</Head>

<Body>

<A title = "Back to Top" href = "javascript: void (0)" class = "back_top"> </a>

<Script src = "js/jquery-1.11.0.min.js"> </script>

<Script>

Var mousewheelevt = (/Firefox/I. test (navigator. userAgent ))? "DOMMouseScroll": "mousewheel"; // FF doesn' t recognize mousewheel as of FF3.x

If (document. attachEvent) // if IE (and Opera depending on user setting)

Document. attachEvent ("on" + mousewheelevt, function (e ){

Var Tsung document.body.scrolltop+document.doc umentElement. scrollTop;

If (t = 0 ){

$ (". Back_top" ).css ("display", "none ");

}

Else {

$ (". Back_top" ).css ("display", "block ");

}

});

Else if (document. addEventListener) // WC3 browsers

Document. addEventListener (mousewheelevt, function (e ){

Var Tsung document.body.scrolltop+document.doc umentElement. scrollTop;

If (t = 0 ){

$ (". Back_top" ).css ("display", "none ");

}

Else {

$ (". Back_top" ).css ("display", "block ");

}

}, False );

</Script>

</Body>

</Html>

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