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How js achieves multiple different motion effects on the same page

Source: Internet
Author: User
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How js achieves multiple different motion effects on the same page

Key Aspect 1:

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Function getstyle (obj, name ){

If (obj. currentStyle ){

Return obj. currentStyle [name];

} Else {

Return getComputedStyle (obj, false) [name];

}

}

From the style sheet, take the value based on the id and attribute name.

Key Aspect 2:

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If (attr = "opacity "){

Cur = Math. round (parseFloat (getstyle (obj, attr) * 100 );

} Else {

Cur = parseInt (getstyle (obj, attr ));

}

If the transparency value is set, because it may be a decimal point, you need to use parseFloat, And then there may be decimal places, and round them to an integer using the round method.

If you set a non-transparency value, use parseInt to take only the numerical value

Other notes are mentioned in the previous sections and will not be described here.

Finally, run the following code:

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<! DOCTYPE html>

<Html>

<Head>

<Meta charset = "UTF-8"/>

<Title> untitled document </title>

<Style>

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

# Runs li {width: 80px; height: 80px; background: # 06c;

List-style: none; margin: 10px; border: 1px solid #000;

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

</Style>

<Script>

Window. onload = function (){

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

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

Runs_li [0]. onmouseover = function (){

Startrun (this, "width", 300 );

}

Runs_li [0]. onmouseout = function (){

Startrun (this, "width", 80 );

}

Runs_li [1]. onmouseover = function (){

Startrun (this, "height", 300 );

}

Runs_li [1]. onmouseout = function (){

Startrun (this, "height", 80 );

}

Runs_li [2]. onmouseover = function (){

Startrun (this, "fontSize", 50 );

}

Runs_li [2]. onmouseout = function (){

Startrun (this, "fontSize", 14 );

}

Runs_li [3]. onmouseover = function (){

Startrun (this, "opacity", 100 );

}

Runs_li [3]. onmouseout = function (){

Startrun (this, "opacity", 30 );

}

}

Function startrun (obj, attr, target ){

ClearInterval (obj. timer );

Obj. timer = setInterval (function (){

Var cur = 0;

If (attr = "opacity "){

Cur = Math. round (parseFloat (getstyle (obj, attr) * 100 );

} Else {

Cur = parseInt (getstyle (obj, attr ));

}

Var speed = (target-cur)/8;

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

 

If (cur = target ){

ClearInterval (obj. timer );

} Else {

If (attr = "opacity "){

Obj. style. filter = 'Alpha (opacity = '+ (cur + speed) + ')';

Obj. style. opacity = (cur + speed)/100;

} Else {

Obj. style [attr] = cur + speed + "px ";

}

}

}, 30 );

}

Function getstyle (obj, name ){

If (obj. currentStyle ){

Return obj. currentStyle [name];

} Else {

Return getComputedStyle (obj, false) [name];

}

}

</Script>

</Head>

<Body>

<Ul id = "runs">

<Li style = "top: 0"> 1 </li>

<Li style = "top: 90px;"> 2 </li>

<Li style = "top: 180px;"> 3 </li>

<Li style = "top: 270px;"> 4 </li>

</Ul>

</Body>

</Html>

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