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  5. transition-timing-function

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transition-timing-function

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since ⁨2015年9月⁩.

transition-timing-function CSS 屬性用於表示各個被動畫特效影響的屬性的區間值計算方式。

嘗試一下

transition-timing-function: linear; 
transition-timing-function: ease-in; 
transition-timing-function: steps(6, end); 
transition-timing-function: cubic-bezier(0.29, 1.01, 1, -0.68); 
<section id="default-example"> <div id="example-element">Hover to see<br />the transition.</div> </section> 
#example-element { background-color: #e4f0f5; color: #000; padding: 1rem; border-radius: 0.5rem; font: 1em monospace; width: 100%; transition: margin-right 2s; } #default-example:hover > #example-element { background-color: #909; color: #fff; margin-right: 40%; }

本質上，這個屬性讓你使用加速度曲線來表示動畫變換的速度。

而每個可以動畫化的屬性使用一個 <timing-function> 作為加速度曲線。

你也許有許多時間函數，而你可以透過使用 transition-property 屬性來個別設置。如果有前述清單的數量超過時間函數的數量，則會使用預設值 ease；如果少於那多餘的時間函數會被忽略，在這兩種情況，CSS 宣告總會有效。

語法

css
/* Keyword */ transition-timing-function: ease; transition-timing-function: ease-in; transition-timing-function: ease-out; transition-timing-function: ease-in-out; transition-timing-function: linear; transition-timing-function: step-start; transition-timing-function: step-end; /* 函數 */ transition-timing-function: steps(4, end); transition-timing-function: cubic-bezier(0.1, 0.7, 1, 0.1); transition-timing-function: frames(10); /* 多個函數 */ transition-timing-function: ease, step-start, cubic-bezier(0.1, 0.7, 1, 0.1); /* 全域值 */ transition-timing-function: inherit; transition-timing-function: initial; transition-timing-function: unset; /* 包含 transition-property */ transition-property: width, height; transition-timing-function: ease-in, ease-out; // ease-in to width and ease-out to height

值

<timing-function>

每個 <timing-function> 連結到對應的動畫化屬性，請參考 transition-property。

公式語法

transition-timing-function = 
 <easing-function># 

<easing-function> = 
 <linear-easing-function> |
 <cubic-bezier-easing-function> |
 <step-easing-function> 

<linear-easing-function> = 
 linear |
 <linear()> 

<cubic-bezier-easing-function> = 
 ease |
 ease-in |
 ease-out |
 ease-in-out |
 <cubic-bezier()> 

<step-easing-function> = 
 step-start |
 step-end |
 <steps()> 

<linear()> = 
 linear( [ <number> && <percentage>{0,2} ]# ) 

<cubic-bezier()> = 
 cubic-bezier( [ <number [0,1]> , <number> ]#{2} ) 

<steps()> = 
 steps( <integer> , <step-position>? ) 

<step-position> = 
 jump-start |
 jump-end |
 jump-none |
 jump-both |
 start |
 end

範例

transition-timing-function: ease

transition-timing-function: ease-in

transition-timing-function: ease-out

transition-timing-function: ease-in-out

transition-timing-function: linear

transition-timing-function: step-start

transition-timing-function: step-end

transition-timing-function: steps(4, end)

規範

Specification
CSS Transitions
# transition-timing-function-property
預設值ease
Applies toall elements, ::before and ::after pseudo-elements
繼承與否no
Computed valueas specified
Animation typeNot animatable

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