transition-timing-function

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

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> (en-US) 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 (en-US) 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> (en-US) 連結到對應的動畫化屬性，請參考 transition-property (en-US)。

公式語法

transition-timing-function = 
  <easing-function># (en-US)  

<easing-function> = 
  linear                          | (en-US)
  <linear-easing-function>        | (en-US)
  <cubic-bezier-easing-function>  | (en-US)
  <step-easing-function>          

<linear-easing-function> = 
  linear( <linear-stop-list> )  

<cubic-bezier-easing-function> = 
  ease                                                | (en-US)
  ease-in                                             | (en-US)
  ease-out                                            | (en-US)
  ease-in-out                                         | (en-US)
  cubic-bezier( <number [0,1]> (en-US) , <number> (en-US) , <number [0,1]> (en-US) , <number> (en-US) )  

<step-easing-function> = 
  step-start                             | (en-US)
  step-end                               | (en-US)
  steps( <integer> (en-US) , <step-position>? (en-US) )  

<linear-stop-list> = 
  [ (en-US) <linear-stop> ] (en-US)# (en-US)  

<step-position> = 
  jump-start  | (en-US)
  jump-end    | (en-US)
  jump-none   | (en-US)
  jump-both   | (en-US)
  start       | (en-US)
  end         

<linear-stop> = 
  <number> (en-US)               && (en-US)
  <linear-stop-length>? (en-US)  

<linear-stop-length> = 
  <percentage> (en-US){1,2} (en-US)

範例

`transition-timing-function: ease`

<div class="parent">
  <div class="box">Lorem</div>
</div>

.parent {
  width: 250px;
  height: 125px;
}
.box {
  width: 100px;
  height: 100px;
  background-color: red;
  font-size: 20px;
  left: 0px;
  top: 0px;
  position: absolute;
  -webkit-transition-property: width height background-color font-size left top
    color;
  -webkit-transition-duration: 2s;
  -webkit-transition-timing-function: ease;
  transition-property: width height background-color font-size left top color;
  transition-duration: 2s;
  transition-timing-function: ease;
}
.box1 {
  width: 50px;
  height: 50px;
  background-color: blue;
  color: yellow;
  font-size: 18px;
  left: 150px;
  top: 25px;
  position: absolute;
  -webkit-transition-property: width height background-color font-size left top
    color;
  -webkit-transition-duration: 2s;
  -webkit-transition-timing-function: ease;
  transition-property: width height background-color font-size left top color;
  transition-duration: 2s;
  transition-timing-function: ease;
}

function updateTransition() {
  var el = document.querySelector("div.box");

  if (el) {
    el.className = "box1";
  } else {
    el = document.querySelector("div.box1");
    el.className = "box";
  }

  return el;
}

var intervalID = window.setInterval(updateTransition, 7000);

`transition-timing-function: ease-in`

<div class="parent">
  <div class="box">Lorem</div>
</div>

.parent {
  width: 250px;
  height: 125px;
}
.box {
  width: 100px;
  height: 100px;
  background-color: red;
  font-size: 20px;
  left: 0px;
  top: 0px;
  position: absolute;
  -webkit-transition-property: width height background-color font-size left top
    color;
  -webkit-transition-duration: 2s;
  -webkit-transition-timing-function: ease-in;
  transition-property: width height background-color font-size left top color;
  transition-duration: 2s;
  transition-timing-function: ease-in;
}
.box1 {
  width: 50px;
  height: 50px;
  background-color: blue;
  color: yellow;
  font-size: 18px;
  left: 150px;
  top: 25px;
  position: absolute;
  -webkit-transition-property: width height background-color font-size left top
    color;
  -webkit-transition-duration: 2s;
  -webkit-transition-timing-function: ease-in;
  transition-property: width height background-color font-size left top color;
  transition-duration: 2s;
  transition-timing-function: ease-in;
}

function updateTransition() {
  var el = document.querySelector("div.box");

  if (el) {
    el.className = "box1";
  } else {
    el = document.querySelector("div.box1");
    el.className = "box";
  }

  return el;
}

var intervalID = window.setInterval(updateTransition, 7000);

`transition-timing-function: ease-out`

<div class="parent">
  <div class="box">Lorem</div>
</div>

.parent {
  width: 250px;
  height: 125px;
}
.box {
  width: 100px;
  height: 100px;
  background-color: red;
  font-size: 20px;
  left: 0px;
  top: 0px;
  position: absolute;
  -webkit-transition-property: width height background-color font-size left top
    color;
  -webkit-transition-duration: 2s;
  -webkit-transition-timing-function: ease-out;
  transition-property: width height background-color font-size left top color;
  transition-duration: 2s;
  transition-timing-function: ease-out;
}
.box1 {
  width: 50px;
  height: 50px;
  background-color: blue;
  color: yellow;
  font-size: 18px;
  left: 150px;
  top: 25px;
  position: absolute;
  -webkit-transition-property: width height background-color font-size left top
    color;
  -webkit-transition-duration: 2s;
  -webkit-transition-timing-function: ease-out;
  transition-property: width height background-color font-size left top color;
  transition-duration: 2s;
  transition-timing-function: ease-out;
}

function updateTransition() {
  var el = document.querySelector("div.box");

  if (el) {
    el.className = "box1";
  } else {
    el = document.querySelector("div.box1");
    el.className = "box";
  }

  return el;
}

var intervalID = window.setInterval(updateTransition, 7000);

`transition-timing-function: ease-in-out`

<div class="parent">
  <div class="box">Lorem</div>
</div>

.parent {
  width: 250px;
  height: 125px;
}
.box {
  width: 100px;
  height: 100px;
  background-color: red;
  font-size: 20px;
  left: 0px;
  top: 0px;
  position: absolute;
  -webkit-transition-property: width height background-color font-size left top
    color;
  -webkit-transition-duration: 2s;
  -webkit-transition-timing-function: ease-in-out;
  transition-property: width height background-color font-size left top color;
  transition-duration: 2s;
  transition-timing-function: ease-in-out;
}
.box1 {
  width: 50px;
  height: 50px;
  background-color: blue;
  color: yellow;
  font-size: 18px;
  left: 150px;
  top: 25px;
  position: absolute;
  -webkit-transition-property: width height background-color font-size left top
    color;
  -webkit-transition-duration: 2s;
  -webkit-transition-timing-function: ease-in-out;
  transition-property: width height background-color font-size left top color;
  transition-duration: 2s;
  transition-timing-function: ease-in-out;
}

function updateTransition() {
  var el = document.querySelector("div.box");

  if (el) {
    el.className = "box1";
  } else {
    el = document.querySelector("div.box1");
    el.className = "box";
  }

  return el;
}

var intervalID = window.setInterval(updateTransition, 7000);

`transition-timing-function: linear`

<div class="parent">
  <div class="box">Lorem</div>
</div>

.parent {
  width: 250px;
  height: 125px;
}
.box {
  width: 100px;
  height: 100px;
  background-color: red;
  font-size: 20px;
  left: 0px;
  top: 0px;
  position: absolute;
  -webkit-transition-property: width height background-color font-size left top
    color;
  -webkit-transition-duration: 2s;
  -webkit-transition-timing-function: linear;
  transition-property: width height background-color font-size left top color;
  transition-duration: 2s;
  transition-timing-function: linear;
}
.box1 {
  width: 50px;
  height: 50px;
  background-color: blue;
  color: yellow;
  font-size: 18px;
  left: 150px;
  top: 25px;
  position: absolute;
  -webkit-transition-property: width height background-color font-size left top
    color;
  -webkit-transition-duration: 2s;
  -webkit-transition-timing-function: linear;
  transition-property: width height background-color font-size left top color;
  transition-duration: 2s;
  transition-timing-function: linear;
}

function updateTransition() {
  var el = document.querySelector("div.box");

  if (el) {
    el.className = "box1";
  } else {
    el = document.querySelector("div.box1");
    el.className = "box";
  }

  return el;
}

var intervalID = window.setInterval(updateTransition, 7000);

`transition-timing-function: step-start`

<div class="parent">
  <div class="box">Lorem</div>
</div>

.parent {
  width: 250px;
  height: 125px;
}
.box {
  width: 100px;
  height: 100px;
  background-color: red;
  font-size: 20px;
  left: 0px;
  top: 0px;
  position: absolute;
  -webkit-transition-property: width height background-color font-size left top
    color;
  -webkit-transition-duration: 2s;
  -webkit-transition-timing-function: step-start;
  transition-property: width height background-color font-size left top color;
  transition-duration: 2s;
  transition-timing-function: step-start;
}
.box1 {
  width: 50px;
  height: 50px;
  background-color: blue;
  color: yellow;
  font-size: 18px;
  left: 150px;
  top: 25px;
  position: absolute;
  -webkit-transition-property: width height background-color font-size left top
    color;
  -webkit-transition-duration: 2s;
  -webkit-transition-timing-function: step-start;
  transition-property: width height background-color font-size left top color;
  transition-duration: 2s;
  transition-timing-function: step-start;
}

function updateTransition() {
  var el = document.querySelector("div.box");

  if (el) {
    el.className = "box1";
  } else {
    el = document.querySelector("div.box1");
    el.className = "box";
  }

  return el;
}

var intervalID = window.setInterval(updateTransition, 7000);

`transition-timing-function: step-end`

<div class="parent">
  <div class="box">Lorem</div>
</div>

.parent {
  width: 250px;
  height: 125px;
}
.box {
  width: 100px;
  height: 100px;
  background-color: red;
  font-size: 20px;
  left: 0px;
  top: 0px;
  position: absolute;
  -webkit-transition-property: width height background-color font-size left top
    color;
  -webkit-transition-duration: 2s;
  -webkit-transition-timing-function: step-end;
  transition-property: width height background-color font-size left top color;
  transition-duration: 2s;
  transition-timing-function: step-end;
}
.box1 {
  width: 50px;
  height: 50px;
  background-color: blue;
  color: yellow;
  font-size: 18px;
  left: 150px;
  top: 25px;
  position: absolute;
  -webkit-transition-property: width height background-color font-size left top
    color;
  -webkit-transition-duration: 2s;
  -webkit-transition-timing-function: step-end;
  transition-property: width height background-color font-size left top color;
  transition-duration: 2s;
  transition-timing-function: step-end;
}

function updateTransition() {
  var el = document.querySelector("div.box");

  if (el) {
    el.className = "box1";
  } else {
    el = document.querySelector("div.box1");
    el.className = "box";
  }

  return el;
}

var intervalID = window.setInterval(updateTransition, 7000);

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

<div class="parent">
  <div class="box">Lorem</div>
</div>

.parent {
  width: 250px;
  height: 125px;
}
.box {
  width: 100px;
  height: 100px;
  background-color: red;
  font-size: 20px;
  left: 0px;
  top: 0px;
  position: absolute;
  -webkit-transition-property: width height background-color font-size left top
    color;
  -webkit-transition-duration: 2s;
  -webkit-transition-timing-function: steps(4, end);
  transition-property: width height background-color font-size left top color;
  transition-duration: 2s;
  transition-timing-function: steps(4, end);
}
.box1 {
  width: 50px;
  height: 50px;
  background-color: blue;
  color: yellow;
  font-size: 18px;
  left: 150px;
  top: 25px;
  position: absolute;
  -webkit-transition-property: width height background-color font-size left top
    color;
  -webkit-transition-duration: 2s;
  -webkit-transition-timing-function: steps(4, end);
  transition-property: width height background-color font-size left top color;
  transition-duration: 2s;
  transition-timing-function: steps(4, end);
}

function updateTransition() {
  var el = document.querySelector("div.box");

  if (el) {
    el.className = "box1";
  } else {
    el = document.querySelector("div.box1");
    el.className = "box";
  }

  return el;
}

var intervalID = window.setInterval(updateTransition, 7000);

規格

Specification
CSS Transitions # transition-timing-function-property

預設值 (en-US)	`ease`
Applies to	all elements, `::before` (en-US) and `::after` (en-US) pseudo-elements
繼承與否	no
Computed value (en-US)	as specified
Animation type (en-US)	Not animatable

相容性

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