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How js implements multiple gradient effects on the same page

Source: Internet
Author: User
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How js implements multiple gradient effects on the same page

Here we can achieve one of the five elements, move the mouse up the transparency gradually increases, move the mouse out, the transparency gradually decreases.

Key Aspect 1:

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Var speed = 0;

If (target> obj. alpha ){

Speed = 5;

} Else {

Speed =-5;

}

Based on the comparison between the target value and the current value, it is determined whether the speed is positive or negative.

Key Aspect 2:

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For (I = 0; I <runs_li.length; I ++ ){

Runs_li [I]. timer = null;

Runs_li [I]. alpha = 30;

Runs_li [I]. onmouseover = function (){

Startrun (this, 100 );

}

Runs_li [I]. onmouseout = function (){

Startrun (this, 30 );

}

}

Each element is added with its own transparency value, and their respective transparency changes are separated.

Finally, run the following code:

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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> untitled document </title>

<Style>

Body, ul, li {margin: 0; padding: 0 ;}

# Runs {width: 300px; margin: 10px auto ;}

# Runs li {width: 80px; height: 80px; background: # 06c; list-style: none;

Float: left; margin: 10px; display: inline;

Filter: alpha (opacity = 30); opacity: 0.3 ;}

</Style>

<Script>

Window. onload = function (){

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

Var runs_li = runs. getElementsByTagName ("li ");

Var I = 0;

For (I = 0; I <runs_li.length; I ++ ){

Runs_li [I]. timer = null;

Runs_li [I]. alpha = 30;

Runs_li [I]. onmouseover = function (){

Startrun (this, 100 );

}

Runs_li [I]. onmouseout = function (){

Startrun (this, 30 );

}

}

}

Function startrun (obj, target ){

ClearInterval (obj. timer );

Obj. timer = setInterval (function (){

Var speed = 0;

If (target> obj. alpha ){

Speed = 5;

} Else {

Speed =-5;

}

 

If (obj. alpha = target ){

ClearInterval (obj. timer );

} Else {

Obj. alpha = obj. alpha + speed;

Obj. style. filter = "alpha (opacity =" + obj. alpha + ")";

Obj. style. opacity = obj. alpha/100;

}

 

}, 30)

}

</Script>

</Head>

<Body>

<Ul id = "runs">

<Li> 1 </li>

<Li> 2 </li>

<Li> 3 </li>

<Li> 4 </li>

<Li> 5 </li>

</Ul>

</Body>

</Html>

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